Taxon Details
Holocarpha macradenia
Santa Cruz tarplant
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© 2011 Dylan Neubauer |
© 2016 John Doyen |
© 2016 John B. Moule |
Taxon Summary:
Holocarpha macradenia, commonly known as Santa Cruz tarplant, is a annual herb in the Asteraceae that is found only in California. It occurs within Coastal prairie, Coastal scrub, and Valley and foothill grassland, growing at elevations from 10 to 220 meters. Holocarpha macradenia is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.|
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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| Name Status: |
JEF, FNA, POWO, IPNI, Tropicos |
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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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