Taxon Details

Streptanthus howellii

Howell's jewelflower

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Taxon Summary:

Streptanthus howellii, commonly known as Howell's jewelflower, is a perennial herb in the Brassicaceae that is found in California and elsewhere. It occurs within Lower montane coniferous forest (rocky, and serpentinite), growing at elevations from 305 to 1500 meters. Streptanthus howellii is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification

Scientific Name: Streptanthus howellii Wats.
Common Name: Howell's jewelflower
Family:	Brassicaceae
Element Code:	PDBRA2G0N0
USDA Plants Symbol:	STHO
Synonyms/Other Names:
Name Status:	JEF, FNA, POWO, IPNI, Tropicos

Conservation Status

CA Rare Plant Rank:	1B.2
Fed List:	None
State List:	None
Global Rank:	G2G3
State Rank:	S2
Other Status:	USFS_S
CRPR Changes:
Add Date:	1980-01-01
Date Edited:	2021-05-26

Ecology and Life History

Lifeform: perennial herb

Blooming Period: Jul-Aug

Elevation:
305 - 1500 meters
1000 - 4920 feet

General Habitats:

Lower montane coniferous forest (rocky, serpentinite)

Microhabitat Details:

Microhabitat:

Notes

Notes: Threatened by mining. Candidate for state listing in OR. See Proceedings of the American Academy of Arts and Sciences 20:353 (1885) for original description.
Threats:
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	5
	Total EOs	% of EOs
EOs with Threat Listed:	14	47 %
Road/trail construction/maint.	10	33%
Mining	9	30%
Improper burning regime	4	13%
Other	2	6%
Wood cutting or brush clearing	1	3%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					30
A	B	C	D	X	U
1	3	2	3	0	21

Occurrence Status:
Historical >20 Years	14
Recent <=20 Years	16

Presence:
Presumed Extant	30
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
California (CA), Oregon (OR)

California Counties and Islands: Name (Code)
Del Norte (DNT)

Quads: Name (Quad Code)
Gasquet (4112378), High Divide (4112481), High Plateau Mtn. (4112388), Shelly Creek Ridge (4112387)

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