Species Details
Astragalus agnicidus
Humboldt County milk-vetch
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Species Description:
Astragalus agnicidus, commonly known as Humboldt County milk-vetch, is a perennial herb in the Fabaceae that is found only in California. It occurs within Broadleafed upland forest, and North Coast coniferous forest, growing at elevations from 120 to 800 meters. Astragalus agnicidus is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.|
Scientific Name: Astragalus agnicidus Barneby |
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Common Name: Humboldt County milk-vetch |
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| Family: | Fabaceae | |
| Element Code: | PDFAB0F080 | |
| USDA Plants Symbol: | ASAG | |
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Synonyms/Other Names: |
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| Name Status: |
JEP, FNA, POWO, IPNI, Tropicos |
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| CA Rare Plant Rank: | 1B.1 |
| Fed List: | None |
| State List: | CE (1982-04-01) |
| Global Rank: | G2 |
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State Rank: |
S2 |
| Other Status: | BLM_S; SB_BerrySB; SB_CalBG/RSABG |
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CRPR Changes: |
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| Add Date: | 1974-01-01 |
| Date Edited: | 2024-11-05 |
| Lifeform: perennial herb | ||||||||||||||
Blooming Period: (Mar)Apr-Sep
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Elevation:
120 - 800 meters 395 - 2625 feet |
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General Habitats:
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| Microhabitat Details: | ||||||||||||||
Microhabitat:
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Notes: Rediscovered in 1987 by R. Sutherland, R. Bittman, and K. Berg near Miranda. See Madroño 14(1):37-40 (1957) for original description, Fremontia 16(1):13-14 (1988) for discussion of rediscovery and 20(4):21-22 (1992) for management update, and Madroño 46(4):215 (1999) for occurrence information. |
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Threats: Threatened by grazing, competition, logging, and road maintenance. Potentially threatened by habitat alteration and non-native plants. |
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Taxonomy: |
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| Threat List Total: | 10 | |
| Total EOs | % of EOs | |
| EOs with Threat Listed: | 61 | 88 % |
| THREAT LIST: | ||
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| Road/trail construction/maint. | 46 | 66% |
| Logging | 45 | 65% |
| Other | 32 | 46% |
| Non-native plant impacts | 12 | 17% |
| ORV activity | 11 | 15% |
| Erosion/runoff | 5 | 7% |
| Wood cutting or brush clearing | 3 | 4% |
| Biocides | 1 | 1% |
| Foot traffic/trampling | 1 | 1% |
| Grazing | 1 | 1% |
| Total Occurrences: | 69 | ||||
| Element Occurrence Ranks: | |||||
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| A | B | C | D | X | U |
| 3 | 23 | 23 | 15 | 0 | 5 |
| Occurrence Status: | |||||
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| Historical >20 Years | 7 | ||||
| Recent <=20 Years | 62 | ||||
| Presence: | |||||
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| Presumed Extant | 69 | ||||
| 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) Humboldt (HUM), Mendocino (MEN), Santa Cruz (SCR) |
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Quads: Name (Quad Code) Bailey Ridge (3912324), Bridgeville (4012347), Burbeck (3912344), Cahto Peak (3912365), Cold Spring (3912315), Dutchmans Knoll (3912356), Felton (3712211), Greenough Ridge (3912334), Gualala (3812375), Hales Grove (3912377), Lincoln Ridge (3912366), Mallo Pass Creek (3912316), McGuire Ridge (3812374), Miranda (4012327), Myers Flat (4012337), Navarro (3912325), Northspur (3912345), Noyo Hill (3912346), Sherwood Peak (3912355), Westport (3912367) |
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Notes:
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Presumed Extant
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