Taxon Report
Eriogonum luteolum Greene var. caninum (Greene) Rev.Tiburon buckwheat |
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Species Description:
Eriogonum luteolum var. caninum, commonly known as Tiburon buckwheat, is a annual herb in the Polygonaceae that is found only in California. It occurs within Chaparral, Cismontane woodland, Coastal prairie, and Valley and foothill grassland, growing at elevations from 0 to 700 meters. Eriogonum luteolum var. caninum is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.
Classification
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Scientific Name: |
Eriogonum luteolum Greene var. caninum (Greene) Rev. |
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Common Name: |
Tiburon buckwheat |
| Family: | Polygonaceae |
| Element Code: | PDPGN083S1 |
| USDA Plants Symbol: | ERLUC |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | annual herb |
| Blooming Period: May-Sep | May-Sep |
| Elevation: | 0-700 (0-2295) |
| General Habitats: | Chaparral, Cismontane woodland, Coastal prairie, Valley and foothill grassland |
| Microhabitat: | Gravelly, Sandy, Serpentine |
| 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_CalBG/RSABG |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 26 |
| Element Occurrence Ranks: | |
| Excellent (A) | 2 |
| Good (B) | 0 |
| Fair (C) | 3 |
| Poor (D) | 0 |
| None (X) | 0 |
| Unknown (U) | 21 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Alameda (ALA), Marin (MRN) | |
| Quads: Name (Quad Code) | |
| Bolinas (3712286), Novato (3812215), Oakland East (3712272), Petaluma (3812226)?*, Petaluma River (3812225), San Geronimo (3812216), San Quentin (3712284), San Rafael (3712285) | |
Threat List Data from the CNDDB
| Threat List Total: | 6 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 7 | 27 % | |
| Non-native plant impacts | 4 | 15% |
| Foot traffic/trampling | 3 | 11% |
| Development | 2 | 7% |
| Road/trail construction/maint. | 2 | 7% |
| Erosion/runoff | 1 | 3% |
| Grazing | 1 | 3% |
Notes
| Not clearly distinguishable from var. luteolum north of Tiburon. E. luteolum is similar to E. gracile to the south and E. vimineum to the northeast. Threatened by development, foot traffic, and non-native plants. See Flora Franciscana, pp. 150-151 (1891) by E. Greene for original description, and Phytologia 66(4):378-379 (1989) for alternative treatment which restricts var. caninum to ALA and MRN counties. |
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Threats: |
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Taxonomy: |
Selected References
| CRPR List Change on 2007-10-10 |
Citation
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 22 January 2025].