Taxon Details

Xanthisma gracile

annual bristleweed

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Taxon Summary:

Xanthisma gracile, commonly known as annual bristleweed, is a annual herb in the Asteraceae that is found in California and elsewhere. It occurs within Joshua tree "woodland", and Mojavean desert scrub, growing at elevations from 1220 to 1555 meters. Xanthisma gracile is ranked 4.3, Plants of Limited Distribution, A Watch List; Not very threatened in California.

Classification

Scientific Name: Xanthisma gracile (Nuttall) D.R. Morgan & R.L. Hartman
Common Name: annual bristleweed
Family:	Asteraceae
Element Code:	PDAST640E0
USDA Plants Symbol:
Synonyms/Other Names: Machaeranthera gracilis (Nutt.) Shinners
Name Status:	JEF, FNA, POWO, IPNI, Tropicos

Conservation Status

CA Rare Plant Rank:	4.3
Fed List:	None
State List:	None
Global Rank:	G5
State Rank:	S4
Other Status:	SB_CalBG/RSABG
CRPR Changes:
Add Date:	2001-01-01
Date Edited:	2021-05-26

Ecology and Life History

Lifeform: annual herb

Blooming Period: Apr-Jul(Sep)

Elevation:
1220 - 1555 meters
4005 - 5100 feet

General Habitats:

Joshua tree "woodland"
Mojavean desert scrub

Microhabitat Details:

Microhabitat:

Notes

Notes: See Phytologia 68(6):457 (1990) for taxonomic treatment and SIDA 20(4): 1405-1406 (2003) for revised nomenclature.
Threats:
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	0
	Total EOs	% of EOs
EOs with Threat Listed:	0	0 %

Occurrence Data from the CNDDB

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

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

Presence:
Presumed Extant	0
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
Arizona (AZ), Baja California (BA), California (CA), Colorado (CO), Maine (ME), Nevada (NV), New Mexico (NM), New York (NY), Sonora, Mexico (SO), Texas (TX), Utah (UT)

California Counties and Islands: Name (Code)
San Bernardino (SBD)

Quads: Name (Quad Code)
Castle Peaks (3511532), Hart Peak (3511531), Havasu Lake (3411444), Pinto Valley (3511523)

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