Taxon Details
Polyctenium williamsiae
Williams' combleaf
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Taxon Summary:
Polyctenium williamsiae, commonly known as Williams' combleaf, is a perennial herb in the Brassicaceae that is found in California and elsewhere. It occurs within Great Basin scrub, Marshes and swamps, Pinyon and juniper woodland, Playas, and Vernal pools, growing at elevations from 1347 to 2700 meters. Polyctenium williamsiae is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.|
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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| 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: | 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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