Plant Species of the Bright Angel Trail:
Grand Canyon rock-daisy, Perityle congesta

See Plant Guide to Bright Angel Trail for an introduction to this page, especially the Introduction To These Species Pages.

Characteristics

Identification status: high confidence.

Using the McDougall key:

1b.  Corollas tubular
3a.  Subshrub
4b.  No ligules
13b. Pappus of awns
21b. Pappus of 1-2 awns
22b. Heads about 1/4 inch across ....Perityle congesta

My pictures don't show the pappus; I determined that from a flower in the field.

I had to key out this species, since the only Perityle I've seen previously was P. emoryi, which is an annual with very wide leaves and radiate heads. There is almost no resemblance between the plants at mile 0.09 and P. emoryi! This might be part of the reason this species used to be placed in a separate genus of Laphamia. The Kearney and Peebles distinction between the two genera was:

22a. Achenes not evidently ciliate; pappus of 1 or 2 awns ... Laphamia
22b. Achenes strongly ciliate on the margin;
     pappus of a crown of scales and often 1 or 2 awns (leads to Perityle)

However, at mile 0.89, I ran across some young specimens that bore much more resemblance to P. emoryi.

This species richly deserves its common name of Grand Canyon rock-daisy, since it is quite abundant along the Bright Angel Trail, and grows almost exclusively in the Grand Canyon, known only from northern Arizona and possibly Nevada. USDA Plants says it also occurs in Nevada, but the Flora of North America only gives it in Arizona. Kearney and Peebles say Known only from northern Arizona; Coconino and northern Mohave counties, 2500 to 8000 feet.

From a SEINet search on 29 September 2007, there are a whopping 49 vouchers of this species from the Coconino County portion of the Grand Canyon, including one from Near head of Bright Angel Trail at 7100 feet elevation. Note that there may be additional vouchers at other herbaria not available through SEINet.

First occurrence on Bright Angel Trail: mile 0.09, elevation 6797 feet (2072 m).

Number of plants along Trail: This species is quite abundant along the trail; at least 50 plants were found in at least different 9 locations in September 2007.

Pictures

From 5 September 2007, mile 0.09:

From 14 September 2006, mile 0.09:

From 5 September 2007, mile 0.89. The plants at mile 0.89 have leaves much more similar to Perityle emoryi:

References

See Resources for Grand Canyon Flora for further information on most of these references. Entries in the second column are either the name used in that source or a page reference. The name is linked to online pages when available. If a given reference does not contain this taxon, the entry is either left blank or contains a hyphen.

FamilyAsteraceae
Scientific NamePerityle congesta
1987 Grand Canyon Flora NamePerityle congesta
1987 Grand Canyon Flora page34
SEINet Image PagePerityle congesta
USDA PlantsPerityle congesta
Flora of North AmericaPerityle congesta
Jepson Manual for California treatment
Jepson Manual illustration page
Kearney and Peebles NameLaphamia congesta
Kearney and Peebles Page #916
Vascular Plants of AZ name
Vascular Plants of AZ volume: page
Huisinga et al 2006 namePerityle congesta
Huisinga et al 2006 page numbers212-213
Epple Name-
Epple description page #-
Epple pix #-
McDougall 1964 nameLaphamia congesta
McDougall 1964 page #243
Brian 2000 Name
Phillips 1979 name-
Phillips 1979 page #-
Stockert 1967 name-
Stockert 1967 page #-


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Copyright © 2007 by Tom Chester.
Permission is freely granted to reproduce any or all of this page as long as credit is given to me at this source:
http://tchester.org/gc/plants/species/perityle_congesta.html
Comments and feedback: Tom Chester
Last Update: 29 September 2007