Flora of Idyllwild Park, San Jacinto Mountains
Fig. 1. Lilly Creek in Idyllwild Park, looking downstream just below beginning of steep portion (see text below). This location is just southwest of the Nature Center. Click on the picture for a larger version.
Notes on Some Species
Fig. 2. The flora of Idyllwild Park contains flowers large and small. Note the fingers for scale in the upper pictures, and the pine needles, branches and one incense-cedar twig for scale in the linked version of the lower picture. Click on the pictures for larger versions.
See Michael Charters' Field Trips Photo Gallery: Idyllwild County Park, San Jacinto Mountains, June 2010 for other pictures of flowers from Idyllwild Park.
- Upper left: the almost-unnoticeable teeny-tiny 3 mm (0.1 inch) flower of Parikh's threadstem, Nemacladus parikhiae, a species only described in 2020.
- Upper right: the large showy flower of lemon lily, Lilium parryi, ~12 cm (5 inches) across, the probable namesake of Lilly Creek. (Picture from Tahquitz Valley since we do not yet have a picture of a lemon lily flower from Idyllwild Park.)
- Lower: a field of flowers of volcanic gilia, Gilia ochroleuca ssp. exilis, and Palomar monkeyflower, Mimulus diffusus (called M. palmeri in the Jepson Manual), covering an area.
Idyllwild Park, a Riverside County Park, is located on the west side of Idyllwild. The Park contains a Nature Center on the north side, and a campground on the south side. Day use fees of $3 per adult, $2 per child and $1 per dog are charged.
The Park is roughly one mile long in the north-south direction at its maximum extent, and one half mile long in the east-west direction at its maximum extent. Its shape is roughly rectangular, with a rectangular piece missing on its northwest corner and a triangular piece missing on its southeast corner, with a total area of 202 acres.
Lilly Creek is the main feature of the western part of the Park, essentially forming the western boundary in the north Park and cutting a steep and deep gorge through the south Park as erosion has proceeded upstream from Strawberry Creek. There is over 560 feet of relief from the bottom of Lilly Creek to the top of the knolls above its banks (5200 feet elevation to over 5760 feet).
The USGS Topo Map uses the name Lilly Creek, although it is given as Lily Creek in other sources. The origin of the name is unknown. But since lemon lilies grow in the creek, it is probable that is the origin of the name. Historic references often spell lily as lillies, so the difference in the spelling is not significant.
Idyllwild Creek is the main topographic feature of the eastern and southeastern sides of the park, although most of the northern part of the creek is on private property to the east. The name Idyllwild Creek appears on a local Idyllwild map, but not on the USGS Topographic Map. Idyllwild Creek has a steep western bank extending to Idyllwild Park, and a gentle eastern bank that is essentially a relatively minor feature in Strawberry Creek Valley. Because of the latter, Idyllwild Creek is flatter in elevation profile along its course than Lilly Creek. Idyllwild Creek forms the southeastern boundary of the park and joins Lilly Creek near the southern end of the Park.
The topography of the Park is shown in the Google Earth image in Fig. 3:
Fig. 3. Google Earth View of Idyllwild Park (approximately the shaded green area) looking northwest. The gorge of Lilly Creek is visible in the center, with the campground road contouring up Lilly Creek to cross the Creek. Lilly Creek has created the steep slopes in the southern half of the park. In contrast, the northern half of the park is much flatter. The steep western bank of Idyllwild Creek is mostly to the east of the Park. It is probably not a coincidence that the meadow visible just above the confluence of Lilly and Idyllwild creeks is located there, due to the presumed-higher water table in that area. Click on the picture for a larger unlabeled version.
The elevation profile of Lilly Creek in Idyllwild Park confirms what is seen in Fig. 3. The erosional nick point, shown by the yellow circle in the middle of the profile, occurs just southwest of the Nature Center, at the location shown in Fig. 1. Above that, the creek elevation profile has a constant slope of about 450 feet per mile. Below that the creek has an elevation profile of about 1200 feet per mile until it levels out in the flattish Strawberry Creek area.
Idyllwild Park has a rich vascular-plant flora due to its many different habitats resulting from its topography, and the fairly well-watered Lilly Creek, at least before it was dammed at Foster Lake with upstream diversions for the Idyllwild Water District.
Our main plant surveys occurred on all-day trips on 15, 21 and 25 June 2010, and 20 November 2012, by the following people:
Table 1. Major floral surveys of Idyllwild Park
Date Surveyed Area of Park Participants 15 June 2010 Northwest, mostly on trail Tom Chester, Dave Stith and Kay Madore 21 June 2010 Northwest, mostly in Lilly Creek Tom Chester, Dave Stith and Michael Charters 25 June 2010 Southwest, mostly on trail, and Northeast Tom Chester, Dave Stith and Michael Charters 20 November 2012 Southeast and Northeast Tom Chester and Dave Stith
On each survey, every species encountered was recorded, with its first location recorded by GPS. Abundances were estimated for each species at the end of each survey, by estimating the minimum number of plants we saw along our entire survey up to a maximum of 99 plants.
- Dave Stith did shorter surveys on 1 and 5 September 2010; 19 and 20 April 2011; 13 June 2011; 8 July 2011; 31 December 2011; 2 May 2013; and 16 June 2013, usually with one or two species as targets.
- Bruce Watts did bloom surveys on 22 and 29 April 2017, recording all species in bloom, as well as finding Collomia on 17 June 2013 and teasel in 2012, and counting the Calochortus on 26 June 2016.
- Tom Chester and Nancy Accola surveyed most of the Park on 2 May 2017, with Bruce Watts joining us for the first half of the survey, looking for additions to the flora, checking on some species observed in the past, and updating abundances for some species.
- Tom Chester, Keir Morse, Don Rideout, and Bruce Watts botanized the park on 22 May 2017 to check on a number of species that needed further work.
- Tom Chester botanized the park on 21 September and on 7 October 2020 to check on some species and to look for additions to the flora that might be visible at this time of year.
Our surveys showed dramatic differences in the flora between different areas of the park, so we decided to present the flora separately for three different areas of the park. Our division is shown in Fig. 4, which also shows the hiking trails of the Park. As is almost always the case, boundaries between areas are sometimes somewhat arbitrary.
Fig. 4. Map showing Idyllwild Park, its hiking trails, and division into three floral areas (larger version). Base map from Riverside County Parks
The Southwest area has the clearest delineation, being the only part of Idyllwild Park significantly west of Lilly Creek, with a large area of chaparral plants not present in the rest of the Park. Its boundary with the southeast section is taken to be between the Hillside Trail and the Campground Road.
The Southeast area has extensive flattish moist areas not present in the rest of the Park; the only meadow in the Park; significant human disturbance from the 88 site campground; and borders an extensively-developed residential area. Its northern boundary is taken to be approximately along the top of the steep area to the north. This roughly corresponds to the northern boundary of the southwest section. Trails from the Nature Center that lead to the campground allow a fairly clear delineation on the north, except along the Perimeter Trail. Fortunately, the flora doesn't vary much in that section of the Perimeter Trail, so it makes little difference exactly where the boundary is placed.
The southeast portion has south-facing slopes similar to those of the southwest portion.
The North area is distinctive due to its terrain being above the erosional nick point, and hence not as steep as in the other two sections. Probably as a result of its gentler topography, it is covered by pine forest with no significant chaparral component. It contains the upper portion of Lilly Creek, which has a flatter elevation profile in the north.
The routes we have surveyed as of 24 November 2012, along with the GPS points where the first occurrence of species were recorded, are shown in this map (The GPS points shown on the north side of State Route 243 were not used for the Park Flora.) Although our surveys were not done with these divisions into flora areas in mind, our surveys were perhaps not-coincidentally usually confined to one area.
A few surveys crossed boundaries of the floral areas. For those, it was straightforward to use the GPS locations to assign the first location of species to floral areas. However, plant abundance estimates from those surveys could not be ex post facto separated into the floral areas.
Another effect from surveys that crossed boundaries is a possible loss of completeness in the checklist for the second floral area traversed. This occurs when species are present in both floral areas, since those species would be recorded only from their first location, which would be in the first floral area traversed. Fortunately, we have enough surveys beginning in each area that this loss of completeness is probably not high.
Now that we have the floral areas defined, future surveys can produce better abundance estimates and species lists for each area.
The following is the latest plant checklist for the park from all surveys to 21 September 2020. One species, Orobanche fasciculata (= Aphyllon fasciculatum), came from an iNaturalist observation, and might in fact be an undescribed species, since its flowers are white, not yellow.
We would have included vouchers from Idyllwild Park, but there are no vouchers online that we can be certain have come from the Park itself. There are no online vouchers as of 29 November 2012 whose locality is Idyllwild Park. There are many vouchers with a locality of Idyllwild; we have collected those separately in a Voucher Flora of the Idyllwild Area. However, some of those vouchers are not in fact even from Idyllwild itself, since vouchers often just list the nearest city within 20 miles or even more.
Basic information about the checklist presentation and links:
- Notes on the Scientific Names Used At This Site and
- Information about the links from the Scientific Name and Common Name.
Three species have qualifiers given in front of the scientific name, indicating that the species determination is not 100%. Notes on some of those species are given in the next section.
An asterisk before the Common Name indicates a non-native taxon.
The three columns under the header #Plants give a minimum estimate of the number of plants we saw along our entire survey in each area (up to a maximum of 99 plants). The southwest area (SW) is presented first, since its flora is significantly different from the other two areas, being dominated by chaparral. The other two areas, the north half of the park (N) and the southeast part of the park (SE), have significant riparian areas and are dominated by the pine forest.
For photographs of many of the species from here, see:
- Field Trips Photo Gallery: Idyllwild County Park, San Jacinto Mountains, June 2010 by Michael Charters for photographs of many of these species from 6/21/10 and 6/25/10.
- iNaturalist observations for Idyllwild Park. As of 20 September 2020, there are 304 observations from this area. Don Rideout has contributed the most observations, 45 observations of 44 species, with 77 other observers contributing observations. Be aware that we have not reviewed the determination of most of these observations. Many are not identified to species, and some are incorrectly identified.
This checklist, the version as of 9 March 2021, is also in PlantID.net (except for one species, Nemacladus parikhiae). The list there allows different displays of this checklist, including an illustrated one, and allows searches on some plant characteristics; see Information about PlantID.net.
The PlantID.net platform provides the following information about the lifeforms of the species on this checklist. It contains:
- 22 trees, of which 15 are broadleaf trees and 7 are conifers.
- 24 shrubs. Some plants can sometimes be trees, and sometimes shrubs, so there is overlap in the numbers of shrubs and trees.
- 5 vines.
- 165 herbaceous plants.
- 6 ferns.
- 39 grasses, sedges, and rushes.
Update on 4 July 2021: Deborah Burroughs found three to five Garrya flavescens plants on the south side of the small peak that is immediately south/southwest of the Visitor Center. This will be added to the checklist the next time it is updated.
Version for printing, without other text on this page: html (8 pages) or pdf Clickbook booklet (2 double-sided pages). (See printing instructions for an explanation of these options)
# Famil Scientific Name
Link goes to the Jepson eFlora
Link goes to Calphotos
# Plants SW N SE Ferns 1 Denns Pteridium aquilinum var. pubescens bracken 99 90 2 Equis Equisetum arvense field horsetail 10 3 Equis Equisetum laevigatum smooth scouring rush 99 4 Pteri Cheilanthes covillei beady lipfern 5 5 Pteri Pellaea mucronata var. mucronata bird's-foot fern 15 2 6 Woods Cystopteris fragilis brittle bladder fern 1 Gymnosperms 7 Cupre Calocedrus decurrens incense-cedar 99 99 80 8 Cupre ~Hesperocyparis stephensonii Stephenson cypress 10 9 Pinac Abies concolor white fir 2 2 10 Pinac Pinus coulteri Coulter pine 50 30 99 11 Pinac Pinus jeffreyi Jeffrey pine 17 1 12 Pinac Pinus lambertiana sugar pine 10 40 20 13 Pinac Pinus ponderosa var. pacifica ponderosa pine 6 99 99 Magnoliids 14 Laura Umbellularia californica California bay 10 Eudicots 15 Adoxa Sambucus nigra ssp. caerulea blue elderberry 2 16 Anaca Rhus aromatica basketbush 30 17 Apiac Tauschia parishii Parish's tauschia 50 50 18 Apocy Asclepias californica California milkweed 8 19 Apocy Asclepias eriocarpa Indian milkweed 80 25 35 20 Apocy Vinca major *greater periwinkle 2 99 21 Aster Achillea millefolium yarrow 20 50 20 22 Aster Agoseris retrorsa spear-leaved mountain dandelion 99 2 99 23 Aster Ambrosia acanthicarpa bur-ragweed 25 2 24 Aster Artemisia douglasiana mugwort 99 99 25 Aster Artemisia dracunculus wild tarragon 1 35 26 Aster Artemisia ludoviciana ssp. incompta mountain mugwort 5 20 30 27 Aster Artemisia tridentata big sagebrush 7 28 Aster Cirsium occidentale var. californicum California thistle 10 11 29 Aster Cirsium vulgare *bull thistle 25 30 Aster Corethrogyne filaginifolia California-aster 2 20 99 31 Aster Ericameria cuneata var. cuneata rock goldenbush 1 32 Aster Ericameria nauseosa var. bernardina San Bernardino rubber rabbitbrush 1 8 33 Aster Ericameria pinifolia pine goldenbush 1 34 Aster Erigeron foliosus var. foliosus leafy daisy 99 99 50 35 Aster Eriophyllum confertiflorum var. confertiflorum golden yarrow 50 10 99 36 Aster Gnaphalium palustre western marsh cudweed 99 37 Aster Helianthus californicus California sunflower 47 38 Aster Hemizonella minima dwarf madia 99 39 Aster Heterotheca sessiliflora ssp. echioides bristly goldenaster 1 40 Aster Hulsea vestita ssp. callicarpha beautiful hulsea 20 5 2 41 Aster Lactuca serriola *prickly lettuce 3 42 Aster Lessingia glandulifera var. glandulifera sticky lessingia 99 43 Aster Madia gracilis slender madia 20 44 Aster Malacothrix clevelandii annual malacothrix 1 45 Aster Pentachaeta aurea golden daisy 99 99 46 Aster Pseudognaphalium californicum California everlasting 1 1 47 Aster Pseudognaphalium thermale slender everlasting 10 99 99 48 Aster Rafinesquia californica California chicory 5 49 Aster Solidago velutina ssp. californica goldenrod 50 99 99 50 Aster Sonchus asper ssp. asper *prickly sow thistle 1 51 Aster Sonchus oleraceus *sow thistle 2 52 Aster Stephanomeria exigua ssp. deanei slender wreathplant 1 53 Aster Symphyotrichum defoliatum San Bernardino aster 99 54 Aster Tanacetum parthenium *feverfew 99 99 55 Aster Tragopogon dubius *yellow salsify 7 56 Aster Uropappus lindleyi silver puffs 20 5 57 Betul Alnus rhombifolia white alder 20 15 58 Borag Cryptantha affinis common cryptantha 5 10 59 Borag Cryptantha micrantha var. lepida mountain red-root cryptantha 99 99 99 60 Borag Cryptantha muricata var. jonesii Jones' prickly-nut cryptantha 99 20 61 Borag Cryptantha simulans pine cryptantha 1 99 62 Borag Phacelia imbricata var. patula imbricate phacelia 99 63 Borag Phacelia minor wild canterbury bells 17 64 Borag Plagiobothrys collinus var. fulvescens California popcorn flower 5 65 Borag Plagiobothrys collinus var. ursinus Bear Valley popcorn flower 30 66 Borag Plagiobothrys tenellus slender popcorn flower 99 99 67 Brass Arabidopsis thaliana *Mouse-ear cress 50 68 Brass Boechera californica California elegant rock-cress 50 99 50 69 Brass Cardamine hirsuta *hairy toothwort 20 70 Brass Draba verna *spring draba 99 99 71 Brass Erysimum capitatum var. capitatum western wallflower 17 72 Brass Hirschfeldia incana *shortpod mustard 99 73 Brass Lepidium virginicum ssp. menziesii wild pepper-grass 99 74 Brass Rorippa curvisiliqua curvepod yellow-cress 2 75 Brass Sisymbrium altissimum *tumble-mustard 5 99 76 Brass Thysanocarpus curvipes ssp. curvipes fringe-pod 5 77 Campa Heterocodon rariflorum few-flowered heterocodon 99 78 Campa Nemacladus longiflorus var. longiflorus thread plant 40 99 79 Campa Nemacladus parikhiae Parikh's threadstem 99 80 Capri Lonicera subspicata var. denudata southern honeysuckle 99 70 65 81 Caryo Cerastium fontanum ssp. vulgare *perennial mouse-ear chickweed 2 20 82 Caryo Lychnis coronaria *rose campion 5 1 83 Caryo Silene verecunda white catch-fly 1 99 84 Caryo Spergularia rubra *red sandspurry 20 85 Caryo Stellaria media *common chickweed 10 86 Convo Calystegia occidentalis ssp. fulcrata western morning-glory 30 87 Datis Datisca glomerata Durango root 60 88 Dipsa Dipsacus sativus *Fuller's teasel 1 89 Erica Arctostaphylos glandulosa Eastwood manzanita 40 90 Erica Arctostaphylos pringlei ssp. drupacea pink-bracted manzanita 99 99 99 91 Erica Arctostaphylos pungens Mexican manzanita 2 10 92 Erica Chimaphila menziesii little prince's pine 25 93 Erica Rhododendron occidentale western azalea 60 30 94 Erica Sarcodes sanguinea snow-plant 2 18 95 Eupho Euphorbia lurida woodland spurge 1 96 Fabac Acmispon americanus var. americanus Spanish clover 99 97 Fabac Acmispon heermannii var. heermannii silky lotus 50 50 10 98 Fabac Acmispon nevadensis var. nevadensis Sierra Nevada lotus 30 1 99 Fabac Acmispon strigosus strigose lotus 50 99 99 100 Fabac Astragalus douglasii var. parishii Parish' Jacumba milk-vetch 10 99 40 101 Fabac Hosackia crassifolia var. crassifolia broad-leaved lotus 4 50 102 Fabac Lathyrus latifolius *perennial sweet pea 1 103 Fabac Lathyrus vestitus var. vestitus wild sweetpea 10 99 104 Fabac Lupinus bicolor dwarf lupine 30 20 105 Fabac Lupinus concinnus ssp. optatus showy bajada lupine 5 99 70 106 Fabac Lupinus excubitus var. austromontanus mountain grape-soda lupine 99 99 35 107 Fabac Lupinus formosus western lupine 99 5 108 Fabac Lupinus latifolius var. parishii Parish's lupine 10 109 Fabac ~Melilotus indicus *sourclover 1 110 Fabac Trifolium microcephalum small-head field clover 99 99 111 Fabac Trifolium monanthum ssp. grantianum mountain carpet clover 5 112 Fabac Trifolium variegatum variegated clover 99 30 113 Fabac Trifolium willdenovii tomcat clover 99 99 5 114 Fagac Quercus chrysolepis canyon live oak 50 99 99 115 Fagac Quercus kelloggii California black oak 10 70 55 116 Fagac Quercus wislizeni var. frutescens interior live oak 99 99 117 Fagac Quercus Xmorehus oracle oak 1 1 4 118 Genti Frasera parryi Parry's green-gentian 16 9 119 Geran Erodium cicutarium *redstem filaree 99 120 Gross Ribes nevadense mountain pink currant 80 60 121 Hyper Hypericum scouleri Scouler's St. Johnswort 10 122 Lamia Mentha spicata *spearmint 20 123 Lamia Monardella breweri ssp. lanceolata mustang mint 50 10 10 124 Lamia Scutellaria siphocampyloides curve-flowered skullcap 99 10 125 Lamia Stachys rigida rigid hedge-nettle 99 99 126 Lamia Trichostema austromontanum ssp. austromontanum southern bluecurls 99 127 Loasa Mentzelia dispersa scattered blazing star 10 128 Malva Sidalcea sparsifolia checkerbloom 20 129 Monti Calyptridium monandrum sand cress 30 10 3 130 Monti Claytonia parviflora ssp. utahensis narrow-leaved miner's lettuce 2 20 131 Monti Claytonia parviflora ssp. viridis green miner's lettuce 30 99 99 132 Monti Claytonia rubra ssp. rubra red-stemmed miner's lettuce 99 40 133 Onagr Camissonia strigulosa strigose suncup 2 134 Onagr Camissoniopsis confusa San Bernardino suncup 30 3 99 135 Onagr Clarkia rhomboidea diamond-petaled clarkia 10 99 99 136 Onagr Epilobium brachycarpum autumn willowweed 5 137 Onagr Epilobium canum ssp. latifolium mountain California-fuchsia 18 30 45 138 Onagr Epilobium ciliatum ssp. ciliatum willowherb 99 99 139 Onagr Epilobium densiflorum spike primrose 10 140 Onagr Epilobium glaberrimum ssp. glaberrimum glaucus willowherb 15 141 Onagr Gayophytum heterozygum zig-zag gayophytum 50 142 Onagr Gayophytum oligospermum pinegrove groundsmoke 1 50 30 143 Onagr Oenothera elata ssp. hirsutissima Hooker's evening-primrose 30 144 Oroba Castilleja applegatei ssp. martinii Martin's paintbrush 10 20 145 Oroba Castilleja minor ssp. spiralis lesser paintbrush 99 146 Oroba Cordylanthus rigidus ssp. setiger bristly bird's beak 99 99 147 Oroba Orobanche fasciculata clustered broomrape iN 148 Phrym Mimulus aurantiacus var. pubescens hairy bush monkeyflower 20 23 149 Phrym Mimulus brevipes wide-throated yellow monkeyflower 99 2 150 Phrym Mimulus cardinalis scarlet monkeyflower 70 151 Phrym Mimulus diffusus Palomar monkeyflower 99 99 152 Phrym Mimulus floribundus floriferous monkeyflower 50 99 153 Phrym Mimulus fremontii var. fremontii Fremont's monkeyflower 99 50 154 Phrym Mimulus guttatus common monkeyflower 99 155 Phrym Mimulus pilosus false monkeyflower 90 99 156 Plant Antirrhinum coulterianum Coulter's snapdragon 1 5 157 Plant Keckiella ternata var. ternata whorledleaf penstemon 99 20 7 158 Plant Penstemon centranthifolius scarlet bugler 50 20 75 159 Plant Penstemon labrosus San Gabriel beardtongue 2 60 10 160 Plant Veronica americana American speedwell 99 161 Plata Platanus racemosa western sycamore 1 162 Polem Allophyllum glutinosum sticky false-gilia 10 163 Polem Collomia grandiflora large-flowered collomia 61 164 Polem Eriastrum sapphirinum sapphire woolly-star 99 165 Polem Gilia capitata ssp. abrotanifolia globe gilia x 166 Polem Gilia diegensis coastal gilia 42 30 167 Polem Gilia ochroleuca ssp. exilis volcanic gilia 99 99 168 Polem Leptosiphon ciliatus whisker-brush 10 99 99 169 Polem Leptosiphon lemmonii Lemmon's linanthus 99 170 Polem Saltugilia australis southern gilia 99 171 Polem Saltugilia splendens ssp. splendens splendid gilia 45 99 172 Polyg Eriogonum apiculatum San Jacinto buckwheat 99 173 Polyg Eriogonum davidsonii Davidson's buckwheat 2 174 Polyg Eriogonum gracile var. incultum slender buckwheat 99 175 Polyg Eriogonum molestum pineland buckwheat 99 176 Polyg Eriogonum wrightii var. membranaceum Wright's buckwheat 20 30 40 177 Polyg Polygonum aviculare ssp. depressum *knotweed 1 178 Polyg Rumex acetosella *common sheep sorrel 50 179 Polyg Rumex californicus willow-leaved dock 50 40 180 Polyg Rumex conglomeratus *whorled dock 1 181 Polyg Rumex crispus *curly dock 2 3 182 Polyg Sidotheca trilobata three-lobed oxytheca 99 183 Ranun Aquilegia formosa western columbine 80 80 184 Ranun Clematis ligusticifolia virgin's bower 1 185 Ranun Thalictrum fendleri var. fendleri Fendler's meadow-rue 60 60 186 Rhamn Ceanothus leucodermis chaparral whitethorn 16 3 5 187 Rhamn Ceanothus palmeri Palmer's ceanothus 1 188 Rhamn Frangula californica California coffeeberry 8 6 189 Rhamn Rhamnus ilicifolia hollyleaf redberry 4 190 Rosac Adenostoma fasciculatum chamise 99 191 Rosac Amelanchier utahensis Utah service-berry 2 192 Rosac Cercocarpus betuloides var. betuloides birch-leaf mountain-mahogany 99 6 193 Rosac Drymocallis glandulosa var. viscida sticky cinquefoil 2 99 194 Rosac Drymocallis lactea var. lactea Nevada cinquefoil 4 195 Rosac Fragaria vesca woodland strawberry 99 99 196 Rosac Horkelia clevelandii var. clevelandii Cleveland's horkelia 99 5 197 Rosac Potentilla gracilis var. fastigiata slender cinquefoil 30 198 Rosac Prunus virginiana var. demissa western choke-cherry 20 199 Rosac Rosa californica California wild rose 99 99 200 Rubia Galium angustifolium ssp. angustifolium narrowleaf bedstraw 15 70 70 201 Rubia Galium aparine common bedstraw 60 99 202 Salic Populus fremontii ssp. fremontii Fremont cottonwood 10 203 Salic Salix gooddingii black willow 20 204 Salic Salix laevigata red willow 1 3 205 Salic Salix lasiandra var. lasiandra shining willow 11 206 Salic Salix lasiolepis arroyo willow 15 60 207 Scrop Verbascum thapsus *common mullein 12 208 Urtic Urtica dioica ssp. holosericea stinging nettle 99 99 209 Viola Viola purpurea ssp. quercetorum goosefoot yellow violet 20 2 60 210 Visca Arceuthobium campylopodum pine dwarf-mistletoe 5 99 99 211 Visca Phoradendron serotinum ssp. tomentosum oak mistletoe 20 50 Monocots 212 Agava Hesperoyucca whipplei chaparral yucca 20 5 213 Cyper Carex fracta fragile sheath sedge 99 214 Cyper Carex multicaulis forest sedge 10 30 3 215 Cyper Carex praegracilis clustered field sedge 99 216 Cyper Carex senta swamp sedge 70 217 Cyper ~Carex subfusca brown sedge 12 218 Cyper Scirpus microcarpus panicled bulrush 99 99 219 Irida Iris germanica *iris 1 220 Junca Juncus bryoides moss rush 99 221 Junca Juncus bufonius var. occidentalis western toad rush 99 222 Junca Juncus effusus ssp. austrocalifornicus Sonoran rush 70 90 223 Junca Juncus mexicanus Mexican rush 20 2 99 224 Junca Juncus oxymeris pointed rush 99 225 Lilia Calochortus palmeri var. munzii San Jacinto mariposa lily 73 226 Lilia Lilium parryi lemon lily 30 227 Orchi Piperia elongata dense-flowered rein orchid 10 20 25 228 Poace Agrostis exarata spike bentgrass 5 20 229 Poace Agrostis pallens seashore bentgrass 3 50 230 Poace Agrostis scabra rough bentgrass 5 231 Poace Bromus carinatus var. carinatus California brome 10 99 232 Poace Bromus diandrus *ripgut brome 1 12 22 233 Poace Bromus hallii Hall's brome 20 60 234 Poace Bromus madritensis ssp. rubens *red brome 1 235 Poace Bromus tectorum *downy brome 99 99 99 236 Poace Cynodon dactylon *Bermuda grass 1 237 Poace Deschampsia elongata slender hairgrass 3 6 238 Poace Elymus elymoides squirreltail 30 99 90 239 Poace Elymus glaucus ssp. glaucus blue wildrye 20 99 240 Poace Elymus hispidus *intermediate wheatgrass 1 241 Poace Elymus triticoides creeping wild rye 99 242 Poace Festuca microstachys small fescue 99 243 Poace Festuca myuros *rattail fescue 99 99 99 244 Poace Hordeum murinum *foxtail barley 30 245 Poace Koeleria macrantha June grass 99 99 246 Poace Melica imperfecta coast-range melic 75 16 247 Poace Muhlenbergia rigens deergrass 99 20 70 248 Poace Phalaris canariensis *canarygrass 2 249 Poace Poa bulbosa ssp. vivipara *bulbous blue grass 99 99 250 Poace Poa pratensis ssp. agassizensis Kentucky blue grass 20 99 251 Poace Poa secunda ssp. secunda one-sided bluegrass 50 99 252 Poace Secale cereale *rye 5 1 253 Poace Stipa coronata giant needlegrass 30 254 Poace Stipa occidentalis var. pubescens Elmer's needlegrass 5 30 255 Themi Bloomeria crocea goldenstar 20 60 256 Themi Dichelostemma capitatum ssp. capitatum blue dicks 50 99 8
Notes on Some Species
Hesperocyparis stephensonii. There are about 10 mature trees that have been planted along the southernmost boundary of the park next to a residential area. Since these are planted trees, they could be Hesperocyparis arizonica, or some hybrid between those two species.
Mimulus diffusus. The Jepson Manual First and Second Editions combined this species with the similar M. palmeri species found in the Transverse Ranges and north. M. diffusus is endemic to the Peninsular Ranges and was considered separate from M. palmeri in Munz 1974. Fraga (2012) demonstrated that there were actually five separate species lumped under the name M. palmeri, and restored M. diffusus as a separate species. Fraga updated the Jepson eFlora treatment in 2018 and restored this species, now under the name of Erythranthe diffusa.
Helianthus californicus. This species is found in only one spot, just below the trail southwest of the Visitor Center where it crosses Lilly Creek. It is short rhizomed, and therefore produces a lot of stems, each spaced a few inches apart. Tom's count was 47 live stems in 2020, not all of which produced flowers.
We thank Deborah Burroughs for the minimum estimate of the number of plants of Umbellularia californica, California bay.
Copyright © 2010-2020 by Tom Chester, Dave Stith, Bruce Watts, Michael Charters, Keir Morse, Don Rideout, Kay Madore, and Nancy Accola.
Commercial rights reserved. Permission is granted to reproduce any or all of this page for individual or non-profit institutional internal use as long as credit is given to us at this source:
Comments and feedback: Tom Chester
Last update: 11 October 2020; link to PlantID.net added 9 March 2021; links to Riverside County Parks removed on 17 May 2021 since the county broke all the links; update to mention Garrya flavescens on 4 July 2021