Taxon Report
Rhinotropis subspinosa (S.Watson) J. R. Abbottspiny milkwort |
|
Taxon Summary
Rhinotropis subspinosa, commonly known as spiny milkwort, is a perennial herb in the Polygalaceae that is found in California and elsewhere. It occurs within Great Basin scrub, and Pinyon and juniper woodland, growing at elevations from 1330 to 1705 meters. Rhinotropis subspinosa is ranked 2B.2, Plants Rare, Threatened, or Endangered in California, But More Common Elsewhere; Moderately threatened in California.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: |
|
Ecology and Life History
| Lifeform: | perennial herb |
| Blooming Period: May-Aug | May-Aug |
| Elevation: | 1330-1705 (4365-5595) |
| General Habitats: | Great Basin scrub, Pinyon and juniper woodland |
| Microhabitat: | Gravelly, Rocky |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 2B.2 |
| Global Rank: | G4? |
|
State Rank: |
S3 |
| State List: | None |
| Fed List: | None |
| Other Status: | |
|
CRPR Changes: |
|
Occurrence Data from the CNDDB
| Total Occurrences: | 71 |
| Element Occurrence Ranks: | |
| Excellent (A) | 4 |
| Good (B) | 25 |
| Fair (C) | 5 |
| Poor (D) | 7 |
| None (X) | 0 |
| Unknown (U) | 30 |
| California Endemic: False | |
| 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) | |
Threat List Data from the CNDDB
| Threat List Total: | 4 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 49 | 69 % | |
| Grazing | 25 | 35% |
| Other | 21 | 29% |
| Road/trail construction/maint. | 8 | 11% |
| Non-native plant impacts | 5 | 7% |
Selected References
| Proposed Non-Substantive Name Changes: Multiple taxa in various plant families from the Jepson eFlora revision 11 (2023) |
| Journal of the Botanical Research Institute of Texas 5: 125 – 137. (2011) |
Citation
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 1 February 2025].