Taxon Details
Dodecahema leptoceras
slender-horned spineflower
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Taxon Summary:
Dodecahema leptoceras, commonly known as slender-horned spineflower, is a annual herb in the Polygonaceae that is found only in California. It occurs within Chaparral, Cismontane woodland, and Coastal scrub (alluvial fans), growing at elevations from 200 to 760 meters. Dodecahema leptoceras is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.|
Scientific Name: Dodecahema leptoceras (Gray) Rev. & Hardham |
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Common Name: slender-horned spineflower |
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| Family: | Polygonaceae | |
| Element Code: | PDPGN0V010 | |
| USDA Plants Symbol: | DOLE | |
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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: | FE (1987-09-28) |
| State List: | CE (1982-01-01) |
| Global Rank: | G1 |
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State Rank: |
S1 |
| Other Status: | SB_CalBG/RSABG |
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CRPR Changes: |
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| Add Date: | 1980-01-01 |
| Date Edited: | 2021-12-09 |
| Lifeform: annual herb | ||||||||||||||
Blooming Period: Apr-Jun
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Elevation:
200 - 760 meters 655 - 2495 feet |
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General Habitats:
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| Microhabitat Details: | ||||||||||||||
Microhabitat:
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Notes: Many historical occurrences lost to urbanization and stream channelization; currently threatened by alteration of fire regimes, development, sand and gravel mining, flood control, foot traffic, proposed reservoir construction, recreational activities, vehicles, and non-native plants. See Proceedings of the American Academy of Arts and Sciences 12:269 (1877) for original description, Great Basin Naturalist Memoirs 2:169-190 (1978) for taxonomic treatment, Phytologia 66(2):83-88 (1989) for revised nomenclature, and Madroño 44(3):305 (1997) for discussion of Vail Lake occurrence. |
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Threats: |
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Taxonomy: |
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| Threat List Total: | 13 | |
| Total EOs | % of EOs | |
| EOs with Threat Listed: | 31 | 74 % |
| THREAT LIST: | ||
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| Development | 20 | 47% |
| Altered flood/tidal/hydrologic regime | 10 | 23% |
| Non-native plant impacts | 10 | 23% |
| ORV activity | 10 | 23% |
| Vandalism/dumping/litter | 8 | 19% |
| Other | 6 | 14% |
| Mining | 4 | 9% |
| Dam/Inundation | 4 | 9% |
| Foot traffic/trampling | 3 | 7% |
| Recreational use (non-ORV) | 3 | 7% |
| Road/trail construction/maint. | 3 | 7% |
| Biocides | 1 | 2% |
| Erosion/runoff | 1 | 2% |
| Total Occurrences: | 42 | ||||
| Element Occurrence Ranks: | |||||
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| A | B | C | D | X | U |
| 0 | 13 | 3 | 0 | 15 | 11 |
| Occurrence Status: | |||||
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| Historical >20 Years | 29 | ||||
| Recent <=20 Years | 13 | ||||
| Presence: | |||||
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| Presumed Extant | 27 | ||||
| Possibly Extirpated | 7 | ||||
| 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) Los Angeles (LAX), Riverside (RIV), San Bernardino (SBD) |
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Quads: Name (Quad Code) Agua Dulce (3411843), Alberhill (3311764), Azusa (3411728), Blackburn Canyon (3311667), Burbank (3411823), Desert Hot Springs (3311685), Devore (3411724), El Monte (3411811), Hemet (3311668)*, Lake Elsinore (3311763)*, Mint Canyon (3411844)*, Mt. Wilson (3411821)*, Newhall (3411845), Oat Mountain (3411835), Ontario (3411716), Pasadena (3411822), Pechanga (3311741), Redlands (3411712), San Bernardino North (3411723)*, San Bernardino South (3411713)*, San Fernando (3411834)*, Sunland (3411833), Vail Lake (3311648), Van Nuys (3411824), White Water (3311686), Yucaipa (3411711)* |
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Notes:
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Presumed Extant
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