Taxon Report

Calycadenia villosa DC.

dwarf calycadenia

Print Report


© 2015 David Wolfson

  Classification
Scientific Name:
 Calycadenia villosa DC.
Common Name:
 dwarf calycadenia
Family: Asteraceae
Element Code: PDAST1P0B0
USDA Plants Symbol: CAVI
Synonyms/Other Names:

Ecology and Life History
Lifeform: annual herb
Blooming Period: May-Oct May-Oct
Elevation: 240-1350 (785-4430)
General Habitats: Chaparral, Cismontane woodland, Meadows and seeps, Valley and foothill grassland
Microhabitat: Rocky
Microhabitat Details: fine soils

Conservation Status
CA Rare Plant Rank: 1B.1
Global Rank: G3
State Rank:
 S3
State List: None
Fed List: None
Other Status: BLM_S; SB_SBBG; USFS_S
CRPR Changes:

Occurrence Data from the CNDDB
Total Occurrences: 59
Element Occurrence Ranks:
   Excellent (A) 2
   Good (B) 38
   Fair (C) 3
   Poor (D) 0
   None (X) 1
   Unknown (U) 15

Location
California Endemic:  True
California Counties and Islands: Name (Code)
Monterey (MNT), San Luis Obispo (SLO)
Quads: Name (Quad Code)
Adelaida (3512067)*, Alder Peak (3512183), Bear Canyon (3612113), Bradley (3512077), Bryson (3512171), Burnett Peak (3512172), Burro Mountain (3512173), Camatta Ranch (3512043), Cosio Knob (3612112), Creston (3512055), Hames Valley (3512088), Jolon (3512182), La Panza (3512032), La Panza Ranch (3512042)*, Lime Mountain (3512068), Pebblestone Shut-in (3512161), Tierra Redonda Mountain (3512078)*, Williams Hill (3512181)

Threat List Data from the CNDDB

Threat List Total: 16
EOs with Threat Listed: Total EOs % of EOs
49 83 %
ORV activity 29 49%
Grazing 22 37%
Road/trail construction/maint. 12 20%
Other 9 15%
Feral pigs 9 15%
Military operations 8 13%
Non-native plant impacts 8 13%
Improper burning regime 7 11%
Foot traffic/trampling 2 3%
Development 2 3%
Erosion/runoff 1 1%
Agriculture 1 1%
Dam/Inundation 1 1%
Vandalism/dumping/litter 1 1%
Mining 1 1%
Recreational use (non-ORV) 1 1%

Notes
Probably consists of northern and southern unrecognized subspecies. Habitat lost to construction of San Antonio Reservoir; also threatened by urbanization, vehicles, grazing, feral pigs, alteration of fire regimes, road construction, road maintenance, and non-native plants.
Threats:
Taxonomy:

Selected References

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].