Species Details

Polyctenium williamsiae

Williams' combleaf

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Classification

Scientific Name: Polyctenium williamsiae Rollins
Common Name: Williams' combleaf
Family:	Brassicaceae
Element Code:	PDBRA23030
USDA Plants Symbol:	POWI
Synonyms/Other Names:

Conservation Status

CA Rare Plant Rank:	1B.2
Fed List:	None
State List:	None
Global Rank:	G2Q
State Rank:	S1
Other Status:	BLM_S; USFS_S
CRPR Changes: removed from 1B.2 on 2012-02-08
Add Date:	2001-01-01
Date Edited:	2022-06-08

Ecology and Life History

Lifeform: perennial herb
Blooming Period: Mar-Jul
Elevation: 1347 - 2700 meters 4420 - 8860 feet
General Habitat: Great Basin scrub Marshes and swamps Pinyon and juniper woodland Playas Vernal pools
General Micro Habitat:
Micro Habitat: Lake Margins Sandy Volcanic

Notes

Notes: Threatened by grazing and trampling. Possibly threatened by recreational activities. State-listed as Critically Endangered in NV. A synonym of P. fremontii in TJM 2. See Journal of the Arnold Arboretum 64:508 (1983) for original description, and Intermountain Flora 2B:416-419 (2005) for taxonomic treatment.
Threats:
Taxonomy:
Other:

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					6
A	B	C	D	X	U
0	3	0	0	0	3

Occurrence Status:
Historical >20 Years	1
Recent <=20 Years	5

Presence:
Presumed Extant	6
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

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

California Counties and Islands: Name (Code)
Lassen (LAS), Mono (MNO)

Quads: Name (Quad Code)
Anderson Mtn. (4012085), Aurora (3811838), Cedar Hill (3811827), Dome Hill (3811931), Shaffer Mtn. (4012043), West of Huntoon Spring (3811816)

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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Counties Quads

Selected References

CNPS Status Review:

CRPR List Deletion on 2012-02-08