Species Details
Polyctenium williamsiae
Williams' combleaf
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Scientific Name: Polyctenium williamsiae Rollins |
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Common Name: Williams' combleaf |
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| Family: | Brassicaceae | |
| Element Code: | PDBRA23030 | |
| USDA Plants Symbol: | POWI | |
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Synonyms/Other Names: |
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| CA Rare Plant Rank: | 1B.2 |
| Fed List: | None |
| State List: | None |
| Global Rank: | G2Q |
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State Rank: |
S1 |
| Other Status: | BLM_S; USFS_S |
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CRPR Changes: changed from 1B.2 to 1B.2 on 2012-02-08 |
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| Add Date: | 2001-01-01 |
| Date Edited: | 2023-10-03 |
| Lifeform: perennial herb | ||||||||||||||
Blooming Period: Mar-Jul
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Elevation:
1347 - 2700 meters 4420 - 8860 feet |
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General Habitats:
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| Microhabitat Details: | ||||||||||||||
Microhabitat:
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Notes: Threatened by grazing and trampling. Possibly threatened by recreational activities. State-listed as Critically Endangered in NV. A synonym of P. fremontii in TJM 2. See Journal of the Arnold Arboretum 64:508 (1983) for original description, and Intermountain Flora 2B:416-419 (2005) for taxonomic treatment. |
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Threats: |
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Taxonomy: |
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| Threat List Total: | 6 | |
| Total EOs | % of EOs | |
| EOs with Threat Listed: | 5 | 83 % |
| THREAT LIST: | ||
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| Grazing | 4 | 66% |
| Foot traffic/trampling | 2 | 33% |
| Agriculture | 1 | 16% |
| Mining | 1 | 16% |
| Road/trail construction/maint. | 1 | 16% |
| Surface water diversion | 1 | 16% |
| Total Occurrences: | 6 | ||||
| Element Occurrence Ranks: | |||||
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| A | B | C | D | X | U |
| 0 | 3 | 0 | 0 | 0 | 3 |
| Occurrence Status: | |||||
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| Historical >20 Years | 6 | ||||
| Recent <=20 Years | 0 | ||||
| Presence: | |||||
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| Presumed Extant | 6 | ||||
| Possibly Extirpated | 0 | ||||
| Presumed Extirpated | 0 | ||||
| California Endemic: | |||||||||||||
| California Island: | |||||||||||||
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States: Name (Code) California (CA), Nevada (NV), Oregon (OR) |
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California Counties and Islands: Name (Code) Lassen (LAS), Mono (MNO) |
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Quads: Name (Quad Code) Anderson Mtn. (4012085), Aurora (3811838), Cedar Hill (3811827), Dome Hill (3811931), Shaffer Mtn. (4012043), West of Huntoon Spring (3811816) |
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Notes:
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Presumed Extant
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