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Calycadenia micrantha

R. L. Carr & G. D. Carr

Small-flower Calycadenia

G2Imperiled Found in 1 roadless area NatureServe Explorer →
G2ImperiledGlobal Rank
UnknownThreat Impact
Identity
Unique IDELEMENT_GLOBAL.2.789520
Element CodePDAST1P0C0
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVascular Plant
Endemicendemic to a single state or province
KingdomPlantae
PhylumAnthophyta
ClassDicotyledoneae
OrderAsterales
FamilyAsteraceae
GenusCalycadenia
Concept Reference
Carr, R. L. and G. D. Carr. 2004. A new species of Calycadenia (Asteraceae) from north central California. Sida 21(1):259-265.
Conservation Status
Rank MethodLegacy Rank calculation - Excel v3.1x
Review Date2016-07-19
Change Date2016-07-19
Edition Date2017-10-19
Edition AuthorsR. Bittman (2005, 2016), rev. Treher (2017)
Threat ImpactUnknown
Range Extent5000-20,000 square km (about 2000-8000 square miles)
Number of Occurrences21 - 80
Rank Reasons
Calycadenia micrantha has about 22 known occurrences but more occurrences may be discovered with increased search effort. Threats may include development, changes in fire regime, roads, pigs, nonnative plants and military activities. Most occurrences are on U.S. Forest Service Lands. Basic research is needed on the ecology and biology of this plant.
Range Extent Comments
Endemic to California. The range of this plant includes several counties including Colusa, Humboldt, Lake, Monterey, and Trinity. These counties are largely non-adjacent, suggesting the true distribution may be quite a bit larger than we currently have data for.
Occurrences Comments
Twenty-two occurrences but eight of these are historic and should be surveyed to confirm plants are extant.
Threat Impact Comments
Threats may include fuel breaks, development, alteration of fire regimes, military activities, and feral pig disturbance.
Ecology & Habitat

Habitat

Dry, open rocky ridges, hillsides, talus; openings in scrub, woodland; Elevation: 500-1500 m (Jepson FloraProject 2017). Dry, open, rocky ridges, hillsides and talus; 300-1500 m (FNA 2006c).
Terrestrial Habitats
Forest/WoodlandShrubland/chaparralBare rock/talus/scree
Other Nations (1)
United StatesN2
ProvinceRankNative
CaliforniaS2Yes
Plant Characteristics
DurationANNUAL
Economic Value (Genus)No
Roadless Areas (1)
California (1)
AreaForestAcres
Elk CreekMendocino National Forest23,182
References (4)
  1. Carr, R. L. and G. D. Carr. 2004. A new species of <i>Calycadenia</i> (Asteraceae) from north central California. Sida 21(1):259-265.
  2. Flora of North America Editorial Committee, editor. 2006c. Flora of North America, north of Mexico. Volume 21. Magnoliophyta: Asteridae, part 8: Asteraceae, part 3. Oxford University Press, New York. 616 pp.
  3. Flora of North America Editorial Committee (FNA). 2006c. Flora of North America north of Mexico. Vol. 21. Magnoliophyta: Asteridae, part 8: Asteraceae, part 3. Oxford Univ. Press, New York. xxii + 616 pp.
  4. Jepson Flora Project (eds.) 2015. Jepson Online Interchange for California Floristics. Accessed online: http://ucjeps.berkeley.edu/interchange/