Species Details

Calycadenia micrantha

small-flowered calycadenia

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Photo by ©2021 Aaron Arthur  max-height:128px; max-width:145px;
©2021 Aaron Arthur
Photo by ©2012 Jake Ruygt  max-height:128px; max-width:145px;
©2012 Jake Ruygt
Scientific Name:
Calycadenia micrantha R.L. Carr & G.D. Carr
Common Name:
small-flowered calycadenia
Family: Asteraceae
Element Code: PDAST1P0C0
USDA Plants Symbol: CAMI53
Synonyms/Other Names:
CA Rare Plant Rank: 1B.2
Fed List: None
State List: None
Global Rank: G2
State Rank:
Other Status: USFS_S
CRPR Changes:
added to 1B on 2005-10-24
Add Date: 2005-01-01
Date Edited: 2021-10-04
Lifeform: annual herb
Blooming Period: Jun-Sep
5 - 1500 meters
15 - 4920 feet
General Habitat:
  • Chaparral
  • Meadows and seeps (volcanic)
  • Valley and foothill grassland
General Micro Habitat: sparsely vegetated areas
Micro Habitat:
  • Roadsides
  • Rocky
  • Scree
  • Serpentinite (sometimes)
  • Talus
Most populations small. Surveys at type locality unsuccessful in 2005. Threatened by road maintenance, and potentially threatened by fuel breaks, development, alteration of fire regimes, non-native plants, military activities, and feral pigs. Formerly included in C. truncata ssp. microcephala, a synonym of C. truncata in TJM (1993). See SIDA 21(2):261 (2004) for original description.
Total Occurrences: 22
Element Occurrence Ranks:
1 5 1 0 0 15
Occurrence Status:
Historical >20 Years 10
Recent <=20 Years 12
Presumed Extant 22
Possibly Extirpated 0
Presumed Extirpated 0
California Endemic:
California Island:
States: Name (Code)
California (CA)
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)
Definitions of codes following a county and/or quad:
* Presumed extirpated
(?) Occurrence confirmed, but possibly extirpated
Quad and county data is imported from the CNDDB. Species may be present in other areas where conditions are favorable. These data should NOT be substituted for pre-project review or for on-site surveys.


Presumed Extant
Counties   Quads