Taxon Report
Dodecahema leptoceras (Gray) Rev. & Hardhamslender-horned spineflower |
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Classification
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Scientific Name: |
Dodecahema leptoceras (Gray) Rev. & Hardham |
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Common Name: |
slender-horned spineflower |
| Family: | Polygonaceae |
| Element Code: | PDPGN0V010 |
| USDA Plants Symbol: | DOLE |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | annual herb |
| Blooming Period: Apr-Jun | Apr-Jun |
| Elevation: | 200-760 (655-2495) |
| General Habitats: | Chaparral, Cismontane woodland, Coastal scrub |
| Microhabitat: | Sandy |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.1 |
| Global Rank: | G1 |
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State Rank: |
S1 |
| State List: | CE |
| Fed List: | FE |
| Other Status: | SB_CalBG/RSABG |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 42 |
| Element Occurrence Ranks: | |
| Excellent (A) | 0 |
| Good (B) | 13 |
| Fair (C) | 3 |
| Poor (D) | 0 |
| None (X) | 15 |
| Unknown (U) | 11 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Los Angeles (LAX), Riverside (RIV), San Bernardino (SBD) | |
| 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)* | |
Threat List Data from the CNDDB
| Threat List Total: | 13 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 31 | 74 % | |
| 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% |
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: |
Citation
California Native Plant Society, Rare Plant Program. 2024. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 26 December 2024].