Taxon Report
Phacelia greenei J.T. HowellScott Valley phacelia |
 © 2011 Steve Matson |
Classification
|
Scientific Name: |
Phacelia greenei J.T. Howell |
|
Common Name: |
Scott Valley phacelia |
| Family: | Hydrophyllaceae |
| Element Code: | PDHYD0C1V0 |
| USDA Plants Symbol: | PHGR2 |
|
Synonyms/Other Names: |
|
Ecology and Life History
| Lifeform: | annual herb |
| Blooming Period: Apr-Jun | Apr-Jun |
| Elevation: | 800-2440 (2625-8005) |
| General Habitats: | Closed-cone coniferous forest, Lower montane coniferous forest, Subalpine coniferous forest, Upper montane coniferous forest |
| Microhabitat: | Serpentine |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.2 |
| Global Rank: | G2 |
|
State Rank: |
S2 |
| State List: | None |
| Fed List: | None |
| Other Status: | BLM_S; USFS_S |
|
CRPR Changes: |
|
Occurrence Data from the CNDDB
| Total Occurrences: | 24 |
| Element Occurrence Ranks: | |
| Excellent (A) | 5 |
| Good (B) | 10 |
| Fair (C) | 3 |
| Poor (D) | 0 |
| None (X) | 0 |
| Unknown (U) | 6 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Siskiyou (SIS), Trinity (TRI) | |
| Quads: Name (Quad Code) | |
| Callahan (4112237), China Mtn. (4112245), Duzel Rock (4112256), Eaton Peak (4112238), Fort Jones (4112257), Greenview (4112258), McConaughy Gulch (4112247), Scott Mountain (4112236), South China Mtn. (4112235), Yreka (4112266) | |
Threat List Data from the CNDDB
| Threat List Total: | 10 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 16 | 67 % | |
| Other | 7 | 29% |
| Road/trail construction/maint. | 6 | 25% |
| Logging | 5 | 20% |
| Mining | 5 | 20% |
| Grazing | 5 | 20% |
| ORV activity | 2 | 8% |
| Recreational use (non-ORV) | 1 | 4% |
| Improper burning regime | 1 | 4% |
| Biocides | 1 | 4% |
| Foot traffic/trampling | 1 | 4% |
Notes
| Known only in the vicinity of Scott Valley. |
|
Threats: |
|
Possibly threatened by mining. |
|
Taxonomy: |
|
Similar to the more widespread P. humilis which is sometimes mistaken for P. greenei outside of Scott Valley; differentiated from P. humilis in having glabrous vs. short-hairy stamens in addition to other characters. |
Selected References
| USFS Potential Species of Conservation Concern Profile |
Citation
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 4 January 2025].