Taxon Report
Calycadenia micrantha R.L. Carr & G.D. Carrsmall-flowered calycadenia |
 ©2021 Aaron Arthur |
Classification
|
Scientific Name: |
Calycadenia micrantha R.L. Carr & G.D. Carr |
|
Common Name: |
small-flowered calycadenia |
| Family: | Asteraceae |
| Element Code: | PDAST1P0C0 |
| USDA Plants Symbol: | CAMI53 |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | annual herb |
| Blooming Period: Jun-Sep | Jun-Sep |
| Elevation: | 5-1500 (15-4920) |
| General Habitats: | Chaparral, Meadows and seeps, Valley and foothill grassland |
| Microhabitat: | Roadsides, Rocky, Scree, Serpentine (sometimes), Talus |
| Microhabitat Details: | sparsely vegetated areas |
Conservation Status
| CA Rare Plant Rank: | 1B.2 |
| Global Rank: | G2 |
|
State Rank: |
S2 |
| State List: | None |
| Fed List: | None |
| Other Status: | BLM_S; USFS_S |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 22 |
| Element Occurrence Ranks: | |
| Excellent (A) | 1 |
| Good (B) | 5 |
| Fair (C) | 1 |
| Poor (D) | 0 |
| None (X) | 0 |
| Unknown (U) | 15 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Colusa (COL), Humboldt (HUM), Lake (LAK), Monterey (MNT), Trinity (TRI) | |
| Quads: Name (Quad Code) | |
| Alder Peak (3512183), Bartlett Mtn. (3912227), Bartlett Springs (3912226), Blake Mountain (4012355), Burro Mountain (3512173), Elk Mountain (3912238), Highland Springs (3812288), Lake Mountain (4012314), Long Ridge (4012313), Potato Hill (3912237), Sportshaven (4012344), Swim Ridge (4012322), Upper Lake (3912228) | |
Threat List Data from the CNDDB
| Threat List Total: | 8 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 8 | 36 % | |
| Foot traffic/trampling | 3 | 13% |
| Non-native plant impacts | 3 | 13% |
| Other | 2 | 9% |
| Grazing | 2 | 9% |
| Military operations | 2 | 9% |
| Feral pigs | 1 | 4% |
| Improper burning regime | 1 | 4% |
| Road/trail construction/maint. | 1 | 4% |
Notes
| Most populations small. Surveys at type locality unsuccessful in 2005. |
|
Threats: |
| Threatened by road maintenance, and potentially threatened by fuel breaks, development, alteration of fire regimes, non-native plants, military activities, and feral pigs. |
|
Taxonomy: |
| Formerly included in C. truncata ssp. microcephala, a synonym of C. truncata in TJM (1993). |
Selected References
| Proposed New Add to Rank 1B, G2 / S2.2 |
| SIDA 21(2):261 (2004) |
| Calycadenia micrantha profile for potential Species of Conservation Concern evaluation (2018) |
Citation
California Native Plant Society, Rare Plant Program. 2024. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 28 December 2024].