Species Details

Thelypodium howellii ssp. howellii

Howell's thelypodium

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Photo of Thelypodium howellii ssp. howellii

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:

Conservation Status

CA Rare Plant Rank:	1B.2
Fed List:	None
State List:	None
Global Rank:	G1T1
State Rank:	S1
Other Status:	BLM_S; SB_UCSC; USFS_S
CRPR Changes:
Add Date:	2001-01-01
Date Edited:	2022-12-06

Ecology and Life History

Lifeform: perennial herb

Blooming Period: May-Jul

Elevation:
1200 - 1830 meters
3935 - 6005 feet

General Habitats:

Great Basin scrub
Meadows and seeps (alkaline)

Microhabitat Details:

Microhabitat:

Notes

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:

Threat List Data from the CNDDB

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

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					11
A	B	C	D	X	U
0	1	0	0	0	10

Occurrence Status:
Historical >20 Years	11
Recent <=20 Years	0

Presence:
Presumed Extant	11
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
California (CA), Oregon (OR)*, Washington (WA)*

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)

Notes:

Definitions of codes following a county and/or quad:
*		Presumed extirpated
(?)		Occurrence confirmed, but possibly extirpated
Quad and county data is imported from the CNDDB. Species may be present in other areas where conditions are favorable. These data should NOT be substituted for pre-project review or for on-site surveys.

Regional Map

Map

Presumed Extant

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CNPS Rare Plant Inventory