Species Details
Dodecahema leptoceras
slender-horned spineflower
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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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| 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 | 28 | ||||
| Recent <=20 Years | 14 | ||||
| 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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