Species Details
Holocarpha macradenia
Santa Cruz tarplant
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© 2011 Dylan Neubauer |
© 2016 John Doyen |
© 2016 John B. Moule |
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Scientific Name: Holocarpha macradenia (DC.) Greene |
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Common Name: Santa Cruz tarplant |
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| Family: | Asteraceae | |
| Element Code: | PDAST4X020 | |
| USDA Plants Symbol: | HOMA | |
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Synonyms/Other Names: |
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| CA Rare Plant Rank: | 1B.1 |
| Fed List: | FT (2000-03-20) |
| State List: | CE (1979-09-01) |
| Global Rank: | G1 |
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State Rank: |
S1 |
| Other Status: | SB_CalBG/RSABG; SB_UCBG |
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CRPR Changes: |
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| Add Date: | 1974-01-01 |
| Date Edited: | 2022-01-05 |
| Lifeform: annual herb | ||||||||||||||
Blooming Period: Jun-Oct
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Elevation:
10 - 220 meters 35 - 720 feet |
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General Habitats:
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| Microhabitat Details: | ||||||||||||||
Microhabitat:
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Notes: All extant CCA Co. occurrences (465B, 466A) are introduced; nearly half have failed. Last remaining natural population in the S.F. Bay Area extirpated by development in 1993. Seriously threatened by urbanization, agriculture, non-native plants, and lack of appropriate ecological disturbance. See Fremontia 5(4):15-16 (1978) for species account. |
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Threats: |
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Taxonomy: |
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| Threat List Total: | 10 | |
| Total EOs | % of EOs | |
| EOs with Threat Listed: | 29 | 78 % |
| THREAT LIST: | ||
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| Development | 19 | 51% |
| Grazing | 12 | 32% |
| Non-native plant impacts | 11 | 29% |
| Other | 4 | 10% |
| Foot traffic/trampling | 4 | 10% |
| Road/trail construction/maint. | 3 | 8% |
| Recreational use (non-ORV) | 2 | 5% |
| ORV activity | 2 | 5% |
| Mining | 1 | 2% |
| Agriculture | 1 | 2% |
| Total Occurrences: | 37 | ||||
| Element Occurrence Ranks: | |||||
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| A | B | C | D | X | U |
| 1 | 4 | 8 | 5 | 16 | 3 |
| Occurrence Status: | |||||
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| Historical >20 Years | 29 | ||||
| Recent <=20 Years | 8 | ||||
| Presence: | |||||
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| Presumed Extant | 21 | ||||
| Possibly Extirpated | 8 | ||||
| Presumed Extirpated | 8 | ||||
| California Endemic: | |||||||||||||
| California Island: | |||||||||||||
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States: Name (Code) California (CA) |
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California Counties and Islands: Name (Code) Alameda (ALA)*, Contra Costa (CCA)*, Marin (MRN)*, Monterey (MNT), Santa Cruz (SCR) |
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Quads: Name (Quad Code) Briones Valley (3712282), Felton (3712211), Hayward (3712261)*, Laurel (3712118), Oakland West (3712273)*, Prunedale (3612176), Richmond (3712283)*, San Rafael (3712285)*, Santa Cruz (3612281), Soquel (3612188), Watsonville East (3612186), Watsonville West (3612187) |
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Notes:
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Presumed Extant
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