Taxon Details
Boechera johnstonii
Johnston's rockcress
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Taxon Summary:
Boechera johnstonii, commonly known as Johnston's rockcress, is a perennial herb in the Brassicaceae that is found only in California. It occurs within Chaparral, and Lower montane coniferous forest, growing at elevations from 1350 to 2150 meters. Boechera johnstonii is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.|
Scientific Name: Boechera johnstonii (Munz) Al-Shehbaz |
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Common Name: Johnston's rockcress |
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| Family: | Brassicaceae | |
| Element Code: | PDBRA060Y0 | |
| USDA Plants Symbol: | ||
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Synonyms/Other Names: |
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| Name Status: |
JEF, FNA, POWO, IPNI, Tropicos |
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| CA Rare Plant Rank: | 1B.2 |
| Fed List: | None |
| State List: | None |
| Global Rank: | G1 |
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State Rank: |
S1 |
| Other Status: | SB_CalBG/RSABG; USFS_S |
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CRPR Changes: |
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| Add Date: | 1974-01-01 |
| Date Edited: | 2022-06-08 |
| Lifeform: perennial herb | ||||||||||||||
Blooming Period: Feb-Jun
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Elevation:
1350 - 2150 meters 4430 - 7055 feet |
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General Habitats:
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| Microhabitat Details: often on eroded clay | ||||||||||||||
Microhabitat:
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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. |
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Threats: |
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Taxonomy: |
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| Threat List Total: | 7 | |
| Total EOs | % of EOs | |
| EOs with Threat Listed: | 7 | 70 % |
| THREAT LIST: | ||
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| 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% |
| Total Occurrences: | 10 | ||||
| Element Occurrence Ranks: | |||||
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| A | B | C | D | X | U |
| 1 | 0 | 0 | 0 | 0 | 9 |
| Occurrence Status: | |||||
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| Historical >20 Years | 8 | ||||
| Recent <=20 Years | 2 | ||||
| Presence: | |||||
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| Presumed Extant | 10 | ||||
| Possibly Extirpated | 0 | ||||
| Presumed Extirpated | 0 | ||||
| California Endemic: | |||||||||||||
| California Island: | |||||||||||||
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States: Name (Code) California (CA) |
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California Counties and Islands: Name (Code) Riverside (RIV) |
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Quads: Name (Quad Code) Anza (3311656), Butterfly Peak (3311655), Idyllwild (3311666), Palm View Peak (3311665), San Jacinto Peak (3311676) |
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Notes:
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Presumed Extant
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