Species Details

Rhinotropis subspinosa

spiny milkwort

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Classification

Scientific Name: Rhinotropis subspinosa (S.Watson) J. R. Abbott
Common Name: spiny milkwort
Family:	Polygalaceae
Element Code:	PDPGL021Q0
USDA Plants Symbol:	POSU2
Synonyms/Other Names: Polygala subspinosa Wats.

Conservation Status

CA Rare Plant Rank:	2B.2
Fed List:	None
State List:	None
Global Rank:	G4?
State Rank:	S3
Other Status:
CRPR Changes: changed from 2.2 to 2B.2 on 2013-06-12
Add Date:	1984-01-01
Date Edited:	2023-09-05

Ecology and Life History

Lifeform: perennial herb

Blooming Period: May-Aug

Elevation:
1330 - 1705 meters
4365 - 5595 feet

General Habitats:

Great Basin scrub
Pinyon and juniper woodland

Microhabitat Details:

Microhabitat:

Gravelly
Rocky

Notes

Notes: Known in CA only from the Secret Valley area. Possibly threatened by pipeline construction. See American Naturalist 7:299 (1873) for original description.
Threats:
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	4
	Total EOs	% of EOs
EOs with Threat Listed:	49	69 %
Grazing	25	35%
Other	21	29%
Road/trail construction/maint.	8	11%
Non-native plant impacts	5	7%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					71
A	B	C	D	X	U
4	25	5	7	0	30

Occurrence Status:
Historical >20 Years	59
Recent <=20 Years	12

Presence:
Presumed Extant	71
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

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

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

Quads: Name (Quad Code)
Smoke Creek Ranch (4011958), Al Shinn Canyon (4012061), Bull Flat (4012041), Cherry Mtn. (4012051), Coleville (3811955), Five Springs (4012052), Karlo (4012053), Litchfield (4012044), Little Hat Mtn. (4112011), Little Mud Flat (4012042), Risue Canyon (3811954), Shaffer Mtn. (4012043), Shinn Mtn. (4012062), Snake Lake (4112021), Snowstorm Mtn. (4012063), Spencer Creek (4012031)

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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Selected References

CNPS Status Review:	Proposed Non-Substantive Name Changes: Multiple taxa in various plant families from the Jepson eFlora revision 11 (2023)
Revised Nomenclature:	Journal of the Botanical Research Institute of Texas 5: 125 – 137. (2011)