Flora of Henderson Canyon

Fig. 1. Henderson Canyon as seen from Borrego Springs Road just south of its intersection with Henderson Canyon Road. The black line is the approximate route of the access road. The light blue line begins at the end of the access road, and shows the typical hiking route up the canyon. The darker blue line shows the lower part of the main channel of the active wash. Click on the picture for a larger version.


Introduction
Location
Botanical Highlights
Trip Reports and Pictures from Henderson Canyon
Field Surveys
Vouchers
Species Notes
Checklist


Introduction

There are three main canyons at the base of the San Ysidro / Hot Springs Mountains immediately west of the town of Borrego Springs. From north to south, they are Henderson Canyon, Borrego Palm Canyon, and Hellhole Canyon. Henderson Canyon is the least well known of these three for three reasons:

But those characteristics make Henderson Canyon a delightful canyon to explore. You won't encounter crowds of people, and can get a splendid sense of being alone in the desert while being quite close to Borrego Springs. The open nature of the lower canyon gives good views of Coyote Mountain, the Santa Rosa Mountains, Borrego Springs, the Borrego Badlands, the Salton Sea and the Fish Creek / Vallecito Mountains. The narrow canyons of the upper part are beautiful and can be traveled without the usual thorny vegetation found in wetter areas.

For botanists, this area gives a clear insight into the non-riparian plant species that inhabit alluvial fans, dry washes, and dry canyons. The flora given here is truly representative of such areas, without containing any species that require constant moisture.

But that doesn't mean the species here aren't affected by flowing water! When tropical storms or thunderstorms dump a lot of rain in this canyon, the flood waters can roar through this area. Lindsay and Lindsay (2002) report that flash flooding from Hurricane Doreen in August 1977 caused extensive damage to the De Anza Desert County Club homes in the floodplain of this canyon, with similar flooding in September 1976 and in 1980. Flooding occurred again in 2004 and August 2013. See Flash Flood Species for the species that those floods can bring from higher parts of the canyon to the lower wash.

When you hike this canyon, try to imagine the effect on the landscape and plants from flood waters angrily churning down the existing washes and/or making new washes as they go.

Warning! If you hike this canyon, be sure to either GPS the position of the parking area, or turn around several times on your way up to take careful note of landmarks you can use to return to your car. Once you get only a short distance from your car, it is no longer visible, and hence you cannot get your bearings on it on your return trip. There are a maze of use trails and washlets here, all of which, except one, will take you beyond your car. If you realize you've hiked past your car, simply head north to the access road, and hike that access road directly to your car.

The other tricky spot is on your return trip, leaving the main wash to travel the use trail in the alluvial fan. Again, on the way up, one should either GPS the location where you join the main wash, or carefully note some landmarks you can use to find it.

See Fred Melgert and Carla Hoegen's Henderson Canyon webpage for more information about possible hikes in the canyon, and for a number of beautiful pictures showing the flora of the canyon on their multiple trips there.

Location

Fig. 2 shows the location of Henderson Canyon in the Borrego Valley. Henderson Canyon is immediately north of Borrego Palm Canyon, just northwest of Borrego Springs:


Fig. 2. Locator Map for Henderson Canyon in the Borrego Valley Area.

Henderson Canyon should not be confused with Henderson Canyon Road, which begins one mile east of the mouth of Henderson Canyon at Borrego Springs Road and extends seven miles east to its junction with S22 at the Pegleg Smith Monument at the southeast tip of Coyote Mountain. Nearly every wildflower picture on the web labeled Henderson Canyon, and nearly every voucher with the word Henderson Canyon in the locality, was actually taken along Henderson Canyon Road four miles to the east of the mouth of Henderson Canyon in Coyote Creek Wash.

Henderson Canyon is reached by an unnamed dirt road that heads west from the westernmost end of Henderson Canyon Road, at its intersection with Borrego Springs Road (called Santa Rosa Drive on the topo map). The end of that dirt access road is shown in green in Fig. 3. That road is on private property and gated. It is subject to closure by the property owner, but is apparently open nearly all of the time. Visitors are allowed on the road when the road is open. Please respect both the private property and the state park property if you visit here.

Fig. 3 shows the area surveyed for this Flora, which is described in the section Field Surveys.

Fig. 3. Areas surveyed as of January 2013 are shown by the blue and yellow lines in the lower canyon, and the green and red lines in the upper canyon. The blue diamonds are GPS locations of species, usually only taken where a species was first encountered in a given survey, although some species of interest have multiple GPS points in a given survey. The green line at the extreme right is the access road to the parking area.

Botanical Highlights

This canyon contains the only known specimen of Phacelia rotundifolia in the Borrego Desert, and, in fact, all of San Diego County. This species did not appear in any of the Plant Checklists for San Diego County from Beauchamp's 1986 Flora to Rebman and Simpson's 2006 Fourth Edition Checklist. Mike Crouse and Vince Balch found a single plant of this species in their survey on 13 March 2010, shown in Fig. 4. The photographs of this species were accepted as a voucher at SDSU to document the occurrence of this species in the county.

This is the southwestern-most known occurrence of this species.

Subsequent to this discovery, we found a voucher determined as this species from Sentenac Canyon from 1933. Fortunately, Mike Simpson requested a scan of that voucher. That scan shows the voucher was misdetermined, since the flower had exserted stamens, a much more flaring corolla tube than that of P. rotundifolia, with corolla lobes about as long as the tube, instead of being much shorter than the tube, and leaves that were longer than wide, instead of "rotund".

Fig. 4. Phacelia rotundifolia from Henderson Canyon on 13 March 2010, by Mike Crouse. Click on pictures to get larger versions.

On 12 January 2013, Tom Chester, Mike Crouse, Kate Harper, Vince Balch, and Mary Jo Churchwell attempted to relocate the Phacelia rotundifolia at and near the location remembered by Mike and Vince of the plants, but we didn't see any due to the poor rainfall conditions that year. We surveyed the area again on 6 December 2013, after a good monsoonal season, but found no Phacelia there. 2013-2014 was another poor rainfall season, so no survey was done. Another survey on 25 February 2015 once again found no plants at that location, due to poor germination on the south-facing slope there. No survey was done in 2016 due to the poor rainfall that year as well.

Finally, on 21 March 2017, in a good rainfall year, Fred Melgert and Carla Hoegen spotted six plants very close to the location remembered by Mike and Vince on a southwest-facing base of a ridge! Fred and Carla climbed around the hillside on which the plants were found, but found no additional plants of this species. See Fred and Carla's photographs of P. rotundifolia from that trip.

On 24 March 2017, Tom Chester, Walt Fidler, Keir Morse, Steven Daniel and Jenny Moore did a survey specifically to look for more locations of Phacelia rotundifolia. We surveyed 4.5 miles, including 1.3 miles of the south-facing slope in the vicinity of Mike's location, and 1.1 miles of the north-facing slope on the other side of Henderson Canyon. We found one additional plant in the vicinity of the six plants found by Fred and Carla, and 12 plants at a new location 0.35 miles to the east, on a west-facing part of the base of a ridge. See map showing Tom's survey route (red line) and the P. rotundifolia locations (blue circles with blue diamonds inside). Other members of the search team explored additional areas in the vicinity of the red line as well; we did a lot of climbing in steep areas to examine any rock exposures similar to the known location. The vast majority of similar rock exposures thus do not contain P. rotundifolia.

We intentionally did not voucher any of these plants, or harm the population in any way, since a population of just 19 plants, separated into two populations, is extremely vulnerable to extinction due to population fluctuation. The species might have been more numerous before the severe drought of the last ten years, and it is important that every one of these 19 plants produces as many seeds as possible in order to get its population above the danger zone. If we find a significantly-larger population this year, or if the population rebounds to healthier numbers in subsequent years, one of us will voucher this occurrence.

In the field, without close-up examination, plants of P. rotundifolia look strikingly similar to plants of Perityle emoryi except for their flowers. We were amazed that Mike and Vince were able to spot their original plant, since the thousands of Perityle on these hillsides effectively hide the Phacelia. The only real difference can be seen when both plants are flowering, since Perityle has large flowers, and the Phacelia has tiny flowers. Without close examination, it would be easy to take a Phacelia plant as a Perityle plant that just hadn't started blooming yet. Up close, the leaves of the two species are slightly different in their morphology, but that difference is far too subtle to try to distinguish vegetative specimens in a field survey of non-blooming plants.

Interestingly, the two P. rotundifolia locations are in unusual rock types for our area, a dark metamorphic rock that forms cliffs with only very small crevices for plants to take hold in. See photograph of Mike's location taken on 6 December 2013 and photograph of the new location we found on 24 March 2017. In the latter photograph, Steven Daniel is photographing the P. rotundifolia plants at that location, but the P. rotundifolia plants cannot be seen in that photograph since they are far too small. Most of the white flowers in that photograph on the cliffs are those of Perityle.

We picked our survey route in part from looking at Google Earth, which showed the dark rock in all the cliff areas we searched. However, in the field, most of that dark rock was not in fact similar to the rock on which the P. rotundifolia was found. Most of the dark rock areas seen in the Google Earth image consisted of large boulders that did not form cliffs with crevices, and did not have the same metamorphic rock layers.

We intentionally searched both the south-facing and north-facing slopes of Henderson Canyon, because there are vouchers from both of those habitats. The most common exposure given in vouchers is a south-facing slope, but all orientations are represented in vouchers. One voucher from the north side of the San Bernardino Mountains says it was found on N, E and W facing slopes.

P. rotundifolia appears to grow mostly in unusual rock types, and to greatly prefer limestone habitats. The most common rock type mentioned in vouchers is limestone or dolomite (82 vouchers), followed by basalt / lava (20 vouchers); granite (5 vouchers); and metamorphic rock (1 voucher). The Flora of the Charleston Mountains, Clark County, Nevada says it is found on or below limestone ledges in the Larrea Belt.

We do not know if the dark metamorphic rock on which our two P. rotundifolia locations is found contains limestone or not. Limestone is a fairly rare constituent of the rocks in the Santa Rosa Mountains, but it does occur within the metamorphic rock, and within the West Salton Detachment Fault (=Santa Rosa Cataclastic Zone in Remeika and Lindsay). For example, Anza's Arrow is made of limestone, and there are occasional beds of it in Rattlesnake Canyon. The white streaks in the photograph of the rocks at one of the P. rotundifolia locations might be due to limestone, but we have not verified that this is the case.

Within Henderson Canyon, it would be worthwhile to explore the ridge east of our survey route, since it has habitat very similar to the two known locations. It would also be worthwhile to explore farther up the drainage we partially surveyed on 24 March 2017.

Outside of Henderson Canyon, it would be worth checking locations along the Montezuma Grade of S22 with exposures of both dark metamorphic rock and limestone for other occurrences of P. rotundifolia, as well as the limestone areas in the Santa Rosa Mountain south face.

Monsoonal Species

The fieldwork on 6 December 2013 was done after a very good monsoonal season, which dramatically increased the numbers of plants for some species. For example, we had only found eight plants of Physalis crassifolia in the previous ten surveys, which included surveys done after some monsoonal rain. On 12/6/13 we found hundreds of plants throughout our survey!

Similarly, we had found only 16 plants of Allionia incarnata previously. On 12/6/13 they sometimes tried to trip us as we walked since they were so abundant, with such large mats.

On 12/6/13 we also saw a number of baby Horsfordia newberryi in several places.

One species, Chamaesyce arizonica, is apparently only present here in very good monsoonal years. We had never seen it on previous surveys here, yet it was very abundant on 12/6/13. Although it is said to be a perennial, it appears to behave as an annual in the Borrego Desert.

Some monsoonal species are present here in only small numbers: just five plants of Amaranthus fimbriatus, which mostly lives at higher elevations, and just 13 plants of Pectis papposa.

Although we looked very hard for the following monsoonal species on 12/6/13, we found no trace of them: Chamaesyce micromera, Ditaxis neomexicana, Bouteloua barbata, Abronia villosa, Palafoxia arida and Kallstroemia californica.

Some of these species apparently don't like the habitat here, and the range of others does not quite make it to Henderson Canyon. We found Chamaesyce micromera at the beginning of the dirt access road to Henderson Canyon, one mile below the mouth of Henderson Canyon, but we couldn't find it one mile farther away at the end of that dirt access road at the mouth of Henderson Canyon. Ditaxis neomexicana seems mostly not to live north of S22 in the Borrego Valley west of the Pegleg Monument. Bouteloua barbata doesn't seem to live in the immediate Borrego Springs area, being mostly found at a bit higher elevation to the west and south.

(More highlights to be added, including other species not found here, maps of some species distributions; Kerry Knudsen's find.)

Flash Flood Species

The flash flood of ~25 August 2013 brought down from higher elevations three species that had not previously been seen in any of our surveys of Henderson Canyon:

These species were all found in the lowermost main channel, just above the ABDSP boundary near the De Anza Desert Country Club residences. In addition, five to ten plants of Nicotiana obtusifolia, desert tobacco, were found in this location. This species had been seen previously in Henderson Canyon, but only on the rock cliffs or immediately below them.

Fred Melgert and Carla Hoegen were the first ones to make the amazing find of the two very happy, green and blooming plants of Petalonyx linearis here, on 8 December 2015, and alerted us to their presence here.

The seeds of these four species were most likely deposited by the receding floodwaters, whose water came from the farthest reaches of Henderson Canyon (see below). Many more seeds of these three species were probably in the mud deposited in the De Anza residences, but probably never got a chance to grow there.

It will be interesting to see how long these species persist here.

Here is a bit more explanation of why the receding floodwaters generally come from the farthest reaches of Henderson Canyon:

Every thunderstorm and every flash flood is different, but for simplicity, to understand what generally happens, imagine that intense rain begins to fall uniformly over all of Henderson Canyon. The rain drops coalesce into sheets of water as they cascade down the slopes. The first part of the flood in the lower channel comes from the lower parts of the canyon that are closest to the lower channel, simply because the water from those areas gets there first.

As the flood evolves, water from later rainfall in the closer parts of the canyon is joined by water from the first part of the rain storm from more distant parts of the canyon. This creates the maximum flood water, when all parts of the canyon are contributing water.

After the rain stops and the flood ebbs, there is no water in the flood coming from the near parts of the canyon; it is all "late arriving" water coming from the most distant parts of the canyon. This kindler, gentler water flow now begins seeping into the sand in this lower channel as its velocity decreases, and dropping whatever it is carrying there.

The most distant parts of the canyon are the steep uppermost slopes, which are also the locations most likely to contain the parent Petalonyx linearis population. That water undoubtedly carries seeds from that parent population, or perhaps part of a plant or maybe even an entire plant with seeds.

Fig. 5. Petalonyx linearis from lowermost Henderson Canyon taken by Tom Chester on 15 December 2015. Left: the plant at the higher location in the lower wash, being photographed by Keir Morse in the top picture. Right: the plant at the lower location in the wash. Note that both plants are at the edges of the wash, and were washed down in a flash flood from a distant parent location. Click on pictures to get larger versions.

Trip Reports and Pictures from Henderson Canyon

Field Surveys

Ten all-day field surveys were done from 2 February 2008 to 12 January 2013, usually by multiple botanists on each survey. A total of 28 person days was spent in the field by 13 botanists. Table 1 gives the survey dates, area surveyed, and botanists participating in the survey. Table 2 details the four different areas surveyed.

Table 1. Field Survey Dates, Locations and Participants

#DateArea SurveyedParticipants
102/02/08lower canyonTom Chester
203/14/08lower canyonTom Chester, Wayne Armstrong, Michael Charters, Kate Shapiro
312/29/08south side lower canyonTom Chester, James Dillane, Mike Crouse, Kate Shapiro
401/02/09upper canyon, south forkTom Chester, Mike Crouse, RT Hawke, Shaun Hawke
501/07/09upper canyon, south forkTom Chester, Mike Crouse, Dave Stith
601/12/09upper canyon, north forkTom Chester, Mike Crouse, Bill Sullivan
703/27/09south side lower canyon, plus bit of upper canyon north and south forksTom Chester
804/04/09upper canyon, south forkTom Chester
903/13/10lower canyonMike Crouse, Vince Balch
1001/12/13lower canyon, bit of upper canyon, north forkTom Chester, Mike Crouse, Kate Harper, Vince Balch, Mary Jo Churchwell
1112/06/13lower canyon, upper canyon, south forkTom Chester, Walt Fidler, James Dillane, Jim Roberts
1202/25/15lower canyonTom Chester, Mike Crouse, Adrienne Ballwey, Karyn Sauber, Bill Sullivan, Dick O'Donnell, Kristine ?
1312/15/15lower canyonTom Chester, Kate Harper, Mary Jo Churchwell, Keir Morse
1412/04/16lower canyonTom Chester, Keir Morse, Mike Crouse, Nancy Accola
1503/24/17lower canyon, lowermost side canyon to north Tom Chester, Walt Fidler, Keir Morse, Steven Daniel, Mary Jo Churchwell (0.5), Jenny Moore

Table 2. Surveyed Areas of Henderson Canyon

AreaDescriptionColor of Route in Fig. 2
Lower CanyonThe 2.5 miles from Parking Area to the forks of the upper canyonblue
South SideA 1.7 mile route along the slopes on the south side of the lower canyon and the first main drainage from the southyellow
Upper Canyon, North Fork0.8 mile route up the North Fork of the upper canyongreen
Upper Canyon, South Fork1.1 mile route up the South Fork of the upper canyonred

(results from the surveys to be added)

Vouchers

Jon P. Rebman and Norman Roberts collected 76 vouchers on 22 April 2005, all given as being from a single location.

(More info about the vouchers to be added)

Species Notes

(note on Phacelia cicutaria to be added.)

Checklist for Henderson Canyon

This checklist is compiled from 15 days of fieldwork in Henderson Canyon from February 2008 to March 2017, and from a search of of the Consortium of California Herbaria on 7 January 2013 for species vouchered from this canyon. The fieldwork included prime-time visits in good bloom years, and hence the checklist should be fairly complete.

See:

An asterisk before the common name indicates a non-native species.

It is likely that the single plant of Hoffmannseggia microphylla is not native to Henderson Canyon. It was found only on 15 December 2015, just west of the park boundary, very close to the De Anza residential lots.

We've never seen this species in the Borrego Desert (the northern part of Anza Borrego Desert State Park), although it is fairly common in places in the middle and southern half of the Park. This plant was not present in prior surveys of this location. The closest vouchers are 20 miles to the northeast, in the Coachella Valley, and 30 miles to the southeast, at Fish Creek, which is just outside the area we target for our flora. Fred Melgert and Carla Hoegen report that this species is fairly common in the north part of Fish Creek (the Wind Caves area). It seems most likely that this plant either came from a seed from a population planted in the De Anza subdivision, or from a seed carried back to the De Anza area from a resident's trip to Fish Creek or somewhere else where this species occurs naturally.

The column labeled #Pls gives a minimum estimate of the number of plants from the field surveys, up to a maximum of 99 plants, for species seen in the field surveys for which abundances were noted. Species that were vouchered, but have not yet been seen, have a V in this column.

The column labeled #V gives the number of vouchers in Henderson Canyon.

In 2017, RT Hawke found about ten plants of Bromus tectorum. We haven't yet added that to the flora since we would like to check a specimen to make sure it was not an unusual B. berteroanus. While B. tectorum is very scarce at such low elevations on the desert side of the mountains, it certainly is not impossible that it is in Henderson Canyon, since there is a voucher from Borrego Springs itself, and one from the mouth of Indian Canyon in Collins Valley at 1650 feet elevation.

Version for printing, without lines and other text on this page: html (5 pages) or pdf Clickbook booklet (2 double-sided pages). (See printing instructions for an explanation of these options)

#FamilScientific Name(*)Common Name#Pls
Lycopods
1SelagSelaginella eremophiladesert spike-moss99
Ferns
2PteriCheilanthes covilleibeady lipfern15
3PteriCheilanthes parryiwoolly lipfern99
4PteriCheilanthes viscidasticky lipfern15
5PteriNotholaena californica ssp. californicaCalifornia cloak fern19
6PteriPellaea mucronata var. mucronatabird's-foot fern4
Gymnosperms
7CupreJuniperus californicaCalifornia juniper50
8EphedEphedra asperaMormon tea99
Eudicots
9AcantJusticia californicachuparosa99
10AmaraAmaranthus fimbriatusfringed amaranth5
11ApocyFunastrum hirtellumrambling milkweed13
12ApocyMatelea parvifoliaspearleaf2
13AsterAdenophyllum porophylloidesSan Felipe dogweed99
14AsterAmbrosia dumosaburroweed99
15AsterAmbrosia salsola var. salsolacheesebush99
16AsterBaccharis brachyphyllashort-leaved baccharis30
17AsterBaccharis sergiloidesdesert baccharis10
18AsterBahiopsis parishiiParish's goldeneye99
19AsterBebbia juncea var. asperasweetbush99
20AsterBrickellia desertorumdesert brickellia34
21AsterCalycoseris parryiyellow tackstem2
22AsterCalycoseris wrightiiwhite tackstem1
23AsterChaenactis carphoclinia var. carphocliniapebble pincushion99
24AsterChaenactis fremontiiFremont pincushion99
25AsterEncelia farinosabrittlebush99
26AsterEricameria brachylepisboundary goldenbush22
27AsterGutierrezia sarothraematchweed61
28AsterLogfia arizonicaArizona herba impia15
29AsterLogfia depressadwarf filago30
30AsterLogfia filaginoidesCalifornia filago99
31AsterMalacothrix glabratadesert dandelion99
32AsterMonoptilon bellioidesdesert star99
33AsterPectis papposa var. papposachinch-weed13
34AsterPerityle emoryiEmory's rock-daisy99
35AsterPleurocoronis plurisetaarrow-leaf99
36AsterRafinesquia neomexicanadesert chicory99
37AsterSenecio mohavensisMojave ragwort99
38AsterSonchus oleraceus*sow thistleV
39AsterStephanomeria exigua ssp. exiguaslender wreathplant3
40AsterStephanomeria pauciflorawire-lettuce90
41AsterStylocline gnaphaloideseverlasting nest-straw99
42AsterTrichoptilium incisumyellow-head99
43AsterTrixis californica var. californicaCalifornia trixis90
44AsterUropappus lindleyisilver puffs34
45BoragAmsinckia intermediacommon fiddleneck70
46BoragAmsinckia retrorsasmall-flowered fiddleneck1
47BoragAmsinckia tessellata var. tessellatabristly fiddleneck80
48BoragCryptantha angustifolianarrow-leaved cryptantha99
49BoragCryptantha barbigera var. barbigerabearded cryptantha99
50BoragCryptantha decipiensgravel cryptantha82
51BoragCryptantha maritimaGuadalupe cryptantha99
52BoragCryptantha muricata var. jonesiiJones' prickly-nut cryptantha20
53BoragCryptantha pterocaryawing-nut cryptantha60
54BoragCryptantha utahensisscented cryptantha1
55BoragEmmenanthe penduliflora var. penduliflorawhispering bells99
56BoragEucrypta chrysanthemifolia var. bipinnatifidaeucrypta5
57BoragNama demissa var. demissapurple mat30
58BoragPectocarya heterocarpachuckwalla pectocarya10
59BoragPectocarya peninsularisBaja pectocarya99
60BoragPectocarya platycarpabroad-fruited combseed20
61BoragPectocarya recurvatacurvenut combseed99
62BoragPhacelia campanularia ssp. campanulariadesert bluebells99
63BoragPhacelia cicutaria var. hispidacaterpillar phacelia40
64BoragPhacelia crenulata var. minutifloralittle-flowered heliotrope phacelia75
65BoragPhacelia cryptanthalimestone phaceliaV
66BoragPhacelia distanscommon phacelia99
67BoragPhacelia minorwild canterbury bells3
68BoragPhacelia pedicellatapedicellate phacelia15
69BoragPhacelia rotundifoliaround-leafed phacelia19
70BoragPholistoma membranaceumwhite fiesta flower99
71BrassBoechera perennansperennial rock-cress1
72BrassBrassica tournefortii*Sahara mustard99
73BrassCaulanthus halliiHall's caulanthus41
74BrassCaulanthus lasiophyllusCalifornia mustard15
75BrassDescurainia pinnatawestern tansy-mustard70
76BrassDraba cuneifoliawedge-leaved draba2
77BrassLepidium lasiocarpum ssp. lasiocarpumhairy-podded pepper-grass99
78BrassSisymbrium irio*London rocket50
79BrassSisymbrium orientale*Oriental mustard99
80BrassThysanocarpus curvipesfringe-pod17
81CactaCylindropuntia bigeloviiteddy-bear cholla99
82CactaCylindropuntia ganderiGander's cholla99
83CactaEchinocereus engelmanniiEngelmann's hedgehog cactus2
84CactaFerocactus cylindraceusCalifornia barrel cactus60
85CactaMammillaria dioicaCalifornia fish-hook cactus43
86CactaOpuntia basilaris var. basilarisbeavertail cactus70
87CampaNemacladus glanduliferusglandular nemacladus99
88CampaNemacladus rubescensdesert nemacladus99
89CaryoLoeflingia squarrosaspreading loeflingia60
90ConvoCuscuta californica var. papillosapapillate dodder1
91CrassCrassula connatapygmy-weed99
92CrassDudleya arizonicaArizona chalk dudleya23
93CrassDudleya saxosa ssp. aloidesdesert dudleya10
94CrossCrossosoma bigeloviirock crossosoma7
95EuphoChamaesyce arizonicaArizona spurge99
96EuphoChamaesyce polycarpasmall-seeded spurge99
97EuphoChamaesyce setilobastarfish (Yuma) spurge99
98EuphoDitaxis lanceolatanarrowleaf ditaxis99
99EuphoEuphorbia erianthabeetle spurge19
100FabacAcmispon argophyllus var. argophyllussouthern California silver-lotus11
101FabacAcmispon glaber var. brevialatusshort-winged deerweed81
102FabacAcmispon maritimus var. brevivexillusshort-bannered coastal lotus99
103FabacAcmispon micranthusSan Diego birdsfoot lotus40
104FabacAcmispon rigidusdesert lotus51
105FabacAcmispon strigosusstrigose lotus32
106FabacAstragalus nuttallianus var. cedrosensisCedros milk-vetch75
107FabacHoffmannseggia microphyllawand holdback1
108FabacLupinus arizonicusArizona lupine99
109FabacLupinus concinnusbajada lupine99
110FabacLupinus sparsiflorusCoulter's lupine99
111FabacPsorothamnus schottiiindigo bush99
112FabacSenegalia greggiicatclaw99
113FouquFouquieria splendens ssp. splendensocotillo99
114GeranErodium cicutarium*redstem filaree99
115GeranErodium texanumTexas filaree10
116KrameKrameria bicolorwhite rhatany20
117KrameKrameria erectaPima rhatany75
118LamiaHyptis emoryidesert-lavender99
119LamiaSalvia apianawhite sage5
120LamiaSalvia columbariaechia99
121LamiaSalvia vaseyiVasey's sage99
122LoasaMentzelia albicauliswhite-stemmed blazing star20
123LoasaMentzelia involucratabracted blazing star99
124LoasaPetalonyx linearisnarrow-leaf sandpaper-plant2
125MalvaAyenia compactaayenia22
126MalvaHibiscus denudatusrock hibiscus55
127MalvaHorsfordia newberryiNewberry's velvet mallow30
128MalvaSphaeralcea ambigua var. ambiguaapricot mallow18
129MolluMollugo cerviana*carpet-weed30
130MontiCalyptridium monandrumsand cress99
131NyctaAllionia incarnata var. incarnatasmall-flowered trailing four o'clock99
132NyctaBoerhavia triquetra var. intermediafivewing spiderling99
133NyctaMirabilis laevis var. retrorsaBigelow's desert four-o'clock99
134OnagrCamissoniopsis pallida ssp. pallidapale suncup99
135OnagrChylismia cardiophylla ssp. cardiophyllaheartleaf suncup5
136OnagrChylismia claviformis ssp. peirsoniibrown-eyed primrose99
137OnagrEremothera boothii ssp. condensataBooth's evening primrose5
138OnagrEremothera chamaenerioideslong-fruit suncup1
139OnagrEulobus californicusCalifornia suncup99
140PapavEschscholzia minutiflora ssp. minutiflorasmall-flowered poppy99
141PapavEschscholzia parishiiParish's poppy99
142PhrymMimulus bigelovii var. bigeloviiBigelow's monkeyflower99
143PlantAntirrhinum filipesdesert twining snapdragon3
144PlantMohavea confertifloraghost flower40
145PlantPenstemon clevelandii var. connatusSan Jacinto beardtongue1
146PlantPlantago ovatadesert plantain99
147PlantPlantago patagonicaPatagonia plantain99
148PolemEriastrum eremicum ssp. eremicumdesert woolly-star99
149PolemGilia stellatastar gilia99
150PolemLangloisia setosissima ssp. setosissimabristly langloisia99
151PolemLoeseliastrum matthewsiidesert calico70
152PolygChorizanthe brevicornu var. brevicornubrittle spineflower99
153PolygEriogonum fasciculatum var. polifoliumCalifornia buckwheat70
154PolygEriogonum gracile var. incultumslender buckwheat3
155PolygEriogonum inflatumdesert trumpet77
156PolygEriogonum thomasiiThomas' buckwheat30
157PolygEriogonum wrightii var. nodosumWright's buckwheat99
158PolygPterostegia drymarioidesfairy bowties, threadstem60
159RanunDelphinium parishii ssp. subglobosumintermediate larkspur50
160RosacPrunus fremontiidesert apricot8
161RubiaGalium stellatumstar-flowered bedstraw37
162SimmoSimmondsia chinensisjojoba14
163SolanDatura discolordesert thornapple99
164SolanLycium andersoniiAnderson's boxthorn3
165SolanNicotiana obtusifoliadesert tobacco35
166SolanPhysalis crassifoliathick-leaved ground cherry99
167UrticParietaria hespera var. hesperapellitory40
168ViscaPhoradendron californicumdesert mistletoe12
169ZygopFagonia laevisCalifornia fagonia99
170ZygopLarrea tridentatacreosote bush99
Monocots
171AgavaAgave deserti var. desertidesert agave99
172PoaceAristida adscensionissix-weeks three-awn99
173PoaceAristida purpureapurple three-awn24
174PoaceBouteloua aristidoides var. aristidoidesneedle grama99
175PoaceBromus berteroanusChilean chess40
176PoaceBromus madritensis ssp. rubens*red brome99
177PoaceFestuca bromoides*brome fescue99
178PoaceFestuca octoflorahairy six-weeks fescue99
179PoaceHilaria rigidabig galleta99
180PoaceHordeum murinum*foxtail barley1
181PoaceMelica frutescenstall melica5
182PoaceMuhlenbergia microspermalittleseed muhly1
183PoacePennisetum setaceum*fountain grass99
184PoaceSchismus barbatus*Mediterranean schismus99
185PoaceStipa speciosadesert needlegrass5
186ThemiMuilla maritimamuilla23


Voucher data provided by the participants of the Consortium of California Herbaria (ucjeps.berkeley.edu/consortium/)


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Copyright © 2008-2017 by Tom Chester (14), Mike Crouse (8), Keir Morse (3), Mary Jo Churchwell (2.5), James Dillane (2), Walt Fidler (2), Kate Shapiro (2), Kate Harper (2), Vince Balch (2), Bill Sullivan (2), RT Hawke (1), Shaun Hawke (1), Dave Stith (1), Wayne Armstrong (1), Adrienne Ballwey (1), Michael Charters (1), Jim Roberts (1), Nancy Accola (1), Karyn Sauber (1), Steven Daniel (1), and Jenny Moore (1).
Number in parentheses is the total number of surveys each person participated in.
Permission is freely granted to reproduce any or all of this page as long as credit is given to us at this source:
http://tchester.org/sd/plants/floras/henderson_canyon.html
Comments and feedback: Tom Chester
Last update: 27 March 2017