Taxon Report

Thelypodium howellii Wats. ssp. howellii

Howell's thelypodium

Print Report

©1990 Dean Wm. Taylor

Classification


Scientific Name:	Thelypodium howellii Wats. ssp. howellii
Common Name:	Howell's thelypodium
Family:	Brassicaceae
Element Code:	PDBRA2N051
USDA Plants Symbol:	THHOH
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial herb
Blooming Period: May-Jul	May-Jul
Elevation:	1200-1830 (3935-6005)
General Habitats:	Great Basin scrub, Meadows and seeps
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.2
Global Rank:	G1T1
State Rank:	S1
State List:	None
Fed List:	None
Other Status:	BLM_S; SB_UCSC; USFS_S
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	11
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	1
Fair (C)	0
Poor (D)	0
None (X)	0
Unknown (U)	10

Location


California Endemic: False
California Counties and Islands: Name (Code)
Lassen (LAS), Modoc (MOD), Shasta (SHA)
Quads: Name (Quad Code)
Ash Valley (4112016), Big Swamp (4112121), Boles Meadows East (4112067), Buckhorn Lake (4012081), Canby (4112047), Dixie Peak (4012181), Jacks Butte (4112057), Leonards Hot Springs (4112051), Observation Peak (4012072), Pittville (4112113), Sheepshead (4012077), Spalding Tract (4012067), Straylor Lake (4012171)

Threat List Data from the CNDDB


Threat List Total:	2
EOs with Threat Listed:	Total EOs	% of EOs
	1	9 %
Grazing	1	9%
Other	1	9%

Notes



Known in CA from fewer than twenty occurrences. Endangered in OR. See Proceedings of the American Academy of Arts and Sciences 21:445 (1886) for original description, and Contributions from the Gray Herbarium 204:115-116 (1973) for taxonomic treatment.
Threats:

Taxonomy:

Selected References

USFS Potential Species of Conservation Concern Profile

Citation California Native Plant Society, Rare Plant Program. 2024. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 25 December 2024].