CNPS Inventory Plant Detail

Thelypodium howellii ssp. howellii

Common Name:	Howell's thelypodium
Family:	Brassicaceae
Synonyms:
Element Code:	PDBRA2N051
Full Name:	Thelypodium howellii Wats. ssp. howellii
USDA PLANTS Symbol:	THHOH

Biology
Lifeform: perennial herb Blooming Period: May - July Habitat: • Great Basin scrub • Meadows and seeps (alkaline)

Rarity Status
CA Rare Plant Rank: 1B.2 Rare, threatened, or endangered in California and elsewhere .2: Fairly endangered in California Federal Listing Status: Not Listed State Listing Status: Not Listed State Rank: S2 S2: Imperiled. Global Rank: G2T2 T2: Imperiled. G2: (species) Imperiled.

Occurrence Data from DFG
California Natural Diversity Database

Total # of Known Element Occurrences: 11
Element Occurrence Ranks:

A B C D X U

0 1 0 0 0 10

Population Status:

Historic >20 yrs	Recent <=20 yrs
8	3

Presence:

Present Extant	Possibly Extirpated	Extirpated
11	0	0

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.
To submit rare plant observation data, use the CNDDB field survey form. Please see also the CNPS Rare Plant Data page.
Date Added: 2001-01-01
Last Update: 2010-03-15

Location

Elevation: 1200 - 1830 meters

California Endemic: no

States: California, Oregon, Washington

California Counties and Islands: name (code)
Lassen (LAS), Modoc (MOD), Shasta (SHA)

Quads: name (DWR code) USGS code
Spalding Tract (641A) 40120F7, Buckhorn Lake (656A) 40120H1, Observation Peak (656C) 40120G2, Dixie Peak (660A) 40121H1, Straylor Lake (660D) 40121G1, Ash Valley (675C) 41120A6, Big Swamp (677A) 41121B1, Bieber (677C) 41121A2, Pittville (678D) 41121A3, Canby (693A) 41120D7, Leonards Hot Springs (707D) 41120E1, Boles Meadows East (710A) 41120F7, Jacks Butte (710D) 41120E7

Notes:

Definitions of codes preceding a county and/or quad:
*		Presumed extirpated
?		Uncertain about distribution or identity
?*		Uncertain about distribution, but presumed extirpated if once present
(?)		Occurrence confirmed, but possibly extirpated

Species may be present in other areas where conditions are favorable.

Presumed Extant

Presumed Extirpated or Unknown

657

Links to Leading Resources of Taxon Information
USDA PLANTS Calflora CalPhotos Consortium of California Herbaria California Department of Fish and Game: CNDDB Quick Viewer

Suggested Citation
California Native Plant Society (CNPS). Inventory of Rare and Endangered Plants (online edition, v8-01a). California Native Plant Society. Sacramento, CA. Accessed on .

-120.625,41.0