Taxon Report
Hemizonia congesta DC. ssp. congestacongested-headed hayfield tarplant |
 © 2015 Vernon Smith |
Classification
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Scientific Name: |
Hemizonia congesta DC. ssp. congesta |
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Common Name: |
congested-headed hayfield tarplant |
| Family: | Asteraceae |
| Element Code: | PDAST4R0W1 |
| USDA Plants Symbol: | HECOC2 |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | annual herb |
| Blooming Period: Apr-Nov | Apr-Nov |
| Elevation: | 20-560 (65-1835) |
| General Habitats: | Valley and foothill grassland |
| Microhabitat: | Roadsides (sometimes) |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.2 |
| Global Rank: | G5T2 |
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State Rank: |
S2 |
| State List: | None |
| Fed List: | None |
| Other Status: | SB_UCBG |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 52 |
| Element Occurrence Ranks: | |
| Excellent (A) | 1 |
| Good (B) | 5 |
| Fair (C) | 3 |
| Poor (D) | 1 |
| None (X) | 4 |
| Unknown (U) | 38 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Lake (LAK), Marin (MRN), Mendocino (MEN), San Francisco (SFO), San Mateo (SMT), Sonoma (SON) | |
| Quads: Name (Quad Code) | |
| Arched Rock (3812342), Bodega Head (3812331), Bolinas (3712286), Camp Meeker (3812248), Cloverdale (3812371), Cotati (3812236), Glen Ellen (3812235), Healdsburg (3812257), Hunters Point (3712263), Inverness (3812217), Mark West Springs (3812256), Middletown (3812275), Novato (3812215), Noyo Hill (3912346), Oakland West (3712273), Petaluma (3812226), Petaluma River (3812225), Point Bonita (3712275), Point Reyes NE (3812227), San Francisco North (3712274), San Francisco South (3712264), San Geronimo (3812216), San Rafael (3712285), Santa Rosa (3812246), Sebastopol (3812247), Sonoma (3812234), Tomales (3812228), Two Rock (3812237), Valley Ford (3812238), Warm Springs Dam (3812361) | |
Threat List Data from the CNDDB
| Threat List Total: | 8 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 19 | 37 % | |
| Development | 13 | 25% |
| Grazing | 4 | 7% |
| Non-native plant impacts | 3 | 5% |
| Foot traffic/trampling | 2 | 3% |
| Agriculture | 1 | 1% |
| Disking | 1 | 1% |
| Other | 1 | 1% |
| Road/trail construction/maint. | 1 | 1% |
Notes
| Threatened by agriculture, development, and road construction. Possibly threatened by grazing. Hybridizes with H. congesta ssp. lutescens. See H. congesta ssp. leucocephala in The Jepson Manual (1993). What was once considered H. congesta ssp. congesta in The Jepson Manual (1993) is now considered H. congesta ssp. lutescens; a common taxon. |
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Threats: |
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Taxonomy: |
Citation
California Native Plant Society, Rare Plant Program. 2024. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 27 December 2024].