Taxon Report
Boechera johnstonii (Munz) Al-ShehbazJohnston's rockcress |
|
Classification
|
Scientific Name: |
Boechera johnstonii (Munz) Al-Shehbaz |
|
Common Name: |
Johnston's rockcress |
| Family: | Brassicaceae |
| Element Code: | PDBRA060Y0 |
| USDA Plants Symbol: | |
|
Synonyms/Other Names: |
|
Ecology and Life History
| Lifeform: | perennial herb |
| Blooming Period: Feb-Jun | Feb-Jun |
| Elevation: | 1350-2150 (4430-7055) |
| General Habitats: | Chaparral, Lower montane coniferous forest |
| Microhabitat: | Clay |
| Microhabitat Details: | often on eroded clay |
Conservation Status
| CA Rare Plant Rank: | 1B.2 |
| Global Rank: | G1 |
|
State Rank: |
S1 |
| State List: | None |
| Fed List: | None |
| Other Status: | SB_CalBG/RSABG; USFS_S |
|
CRPR Changes: |
|
Occurrence Data from the CNDDB
| Total Occurrences: | 10 |
| Element Occurrence Ranks: | |
| Excellent (A) | 1 |
| Good (B) | 0 |
| Fair (C) | 0 |
| Poor (D) | 0 |
| None (X) | 0 |
| Unknown (U) | 9 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Riverside (RIV) | |
| Quads: Name (Quad Code) | |
| Anza (3311656), Butterfly Peak (3311655), Idyllwild (3311666), Palm View Peak (3311665), San Jacinto Peak (3311676) | |
Threat List Data from the CNDDB
| Threat List Total: | 7 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 7 | 70 % | |
| Grazing | 7 | 70% |
| Foot traffic/trampling | 6 | 60% |
| Development | 5 | 50% |
| Non-native plant impacts | 5 | 50% |
| Wood cutting or brush clearing | 3 | 30% |
| Recreational use (non-ORV) | 2 | 20% |
| Road/trail construction/maint. | 2 | 20% |
Notes
| Known only from the southern San Jacinto Mtns. Threatened by recreational and residential development in Garner Valley. Also threatened by grazing and trampling, and possibly threatened by vegetation/fuels management projects. Boechera hirshbergiae is treated as a synonym of this plant in TJM 2; see Harvard Papers in Botany 11(1):61-88 (2006) for relative taxonomic treatment. See Bulletin of the Southern California Academy of Sciences 31:62-63 (1932) for original description, Rhodora 43(511):467-468 (1941) for taxonomic treatment, and Novon 13(4):381-391 (2003) for revised nomenclature. |
|
Threats: |
|
Taxonomy: |
Citation
California Native Plant Society, Rare Plant Program. 2024. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 27 December 2024].