Taxon Report
Eriogonum truncatum T. & G.Mt. Diablo buckwheat |
|
Species Description:
Eriogonum truncatum, commonly known as Mt. Diablo buckwheat, is a annual herb in the Polygonaceae that is found only in California. It occurs within Chaparral, Coastal scrub, and Valley and foothill grassland, growing at elevations from 3 to 350 meters. Eriogonum truncatum is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.
Classification
|
Scientific Name: |
Eriogonum truncatum T. & G. |
|
Common Name: |
Mt. Diablo buckwheat |
| Family: | Polygonaceae |
| Element Code: | PDPGN085Z0 |
| USDA Plants Symbol: | ERTR11 |
|
Synonyms/Other Names: |
|
Ecology and Life History
| Lifeform: | annual herb |
| Blooming Period: Apr-Sep(Nov-Dec) | Apr-Sep(Nov-Dec) |
| Elevation: | 3-350 (10-1150) |
| General Habitats: | Chaparral, Coastal scrub, Valley and foothill grassland |
| Microhabitat: | Sandy |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.1 |
| Global Rank: | G1 |
|
State Rank: |
S1 |
| State List: | None |
| Fed List: | None |
| Other Status: | SB_UCBG |
|
CRPR Changes: |
|
Occurrence Data from the CNDDB
| Total Occurrences: | 7 |
| Element Occurrence Ranks: | |
| Excellent (A) | 1 |
| Good (B) | 0 |
| Fair (C) | 0 |
| Poor (D) | 0 |
| None (X) | 1 |
| Unknown (U) | 5 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Contra Costa (CCA), Solano (SOL)* | |
| Quads: Name (Quad Code) | |
| Antioch North (3812117)*, Antioch South (3712187)*, Clayton (3712188)?, Diablo (3712178)*, Fairfield South (3812221)* | |
Threat List Data from the CNDDB
| Threat List Total: | 2 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 2 | 29 % | |
| Development | 1 | 14% |
| Non-native plant impacts | 1 | 14% |
Notes
| Rediscovered in May 2005 by Michael Park in Mount Diablo SP; now known from one extant occurrence for which quad location needs confirmation. Potentially threatened by trampling and non-native plants. Much habitat eliminated by urbanization. See Proceedings of the American Academy of Arts and Sciences 8:173 (1870) for original description, and Phytologia 66(4):375-376 (1989) for taxonomic treatment. |
|
Threats: |
|
Taxonomy: |
Selected References
| CRPR List Change on 2005-07-01 |
Citation
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 17 January 2025].