Plant Species of the Bright Angel Trail:
Arizona thistle, Cirsium arizonicum var. nidulum

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

This page is just a shell to hold my photographs and reference information for now, so that readers can see the photographs and this taxon. The identification status, voucher info, and discussion of the species will be added in the future.


Identification status: .

From a SEINet search on 29 September 2007, there are vouchers of this species from the Coconino County portion of the Grand Canyon. The nearest are at: ; and . Note that there may be additional vouchers at other herbaria not available through SEINet.

First occurrence on Bright Angel Trail: mile 0.63, elevation 6445 feet (1964 m); first off-trail occurrence is just off-trail at mile 0.12, elevation 6781 feet (2067 m)

Number of plants along Trail: at least 10 plants were found in at least 9 different locations in September 2007.


From 5 September 2007, mile 0.12; Cirsium arizonicum var. nidulum on the left; Ericameria arizonica on the right:

From 5 September 2007, mile 0.63:


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.

Scientific NameCirsium arizonicum var. nidulum
1987 Grand Canyon Flora NameCirsium nidulum
1987 Grand Canyon Flora page31
SEINet Image PageCirsium arizonicum
USDA PlantsCirsium arizonicum
Flora of North AmericaCirsium arizonicum var. arizonicum
Jepson Manual for California treatmentCirsium nidulum
Jepson Manual illustration page-
Kearney and Peebles NameCirsium nidulum
Kearney and Peebles Page #953
Vascular Plants of AZ name
Vascular Plants of AZ volume: page
Huisinga et al 2006 name-
Huisinga et al 2006 page numbers-
Epple NameCirsium arizonicum
Epple description page #266
Epple pix #569
McDougall 1964 nameCirsium nidulum
McDougall 1964 page #236
Brian 2000 Name
Phillips 1979 nameCirsium arizonicum
Phillips 1979 page #87
Stockert 1967 name-
Stockert 1967 page #-

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Copyright © 2007-2012 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:
Comments and feedback: Tom Chester
Last Update: 9 July 2012