Species Details

Asclepias nyctaginifolia

Mojave milkweed

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Classification

Scientific Name: Asclepias nyctaginifolia Gray
Common Name: Mojave milkweed
Family:	Apocynaceae
Element Code:	PDASC02190
USDA Plants Symbol:	ASNY
Synonyms/Other Names:

Conservation Status

CA Rare Plant Rank:	2B.1
Fed List:	None
State List:	None
Global Rank:	G4?
State Rank:	S2
Other Status:
CRPR Changes: changed from 2.1 to 2B.1 on 2013-06-12 changed from 2.3 to 2.1 on 2009-03-10
Add Date:	2001-01-01
Date Edited:	2021-05-26

Ecology and Life History

Lifeform: perennial herb

Blooming Period: May-Jun

Elevation:
875 - 1700 meters
2870 - 5580 feet

General Habitats:

Mojavean desert scrub
Pinyon and juniper woodland

Microhabitat Details:

Microhabitat:

Notes

Notes: Threatened by solar energy development, road widening, and road maintenance. See Proceedings of the American Academy of Arts and Sciences 12:69 (1876) for original description, and Annals of the Missouri Botanical Garden 41:155-156 (1954) for taxonomic treatment.
Threats:
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	10
	Total EOs	% of EOs
EOs with Threat Listed:	47	70 %
Development	30	44%
Road/trail construction/maint.	14	20%
ORV activity	7	10%
Biocides	3	4%
Grazing	3	4%
Mining	3	4%
Non-native animal impacts	2	2%
Erosion/runoff	1	1%
Foot traffic/trampling	1	1%
Recreational use (non-ORV)	1	1%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					67
A	B	C	D	X	U
1	6	12	14	0	34

Occurrence Status:
Historical >20 Years	7
Recent <=20 Years	60

Presence:
Presumed Extant	67
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
Arizona (AZ), California (CA), Nevada (NV), New Mexico (NM)

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

Quads: Name (Quad Code)
Cajon (3411734), Castle Peaks (3511532), Clark Mtn. (3511555), East of Grotto Hills (3511521), Grotto Hills (3511522), Hackberry Mountain (3511512), Hart Peak (3511531), Ivanpah Lake (3511554), Mescal Range (3511545), Pachalka Spring (3511556), Pinto Valley (3511523), Valley Wells (3511546)

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