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Calycadenia villosa

DC.

Dwarf Rosinweed

G3Vulnerable Found in 3 roadless areas NatureServe Explorer →

G3VulnerableGlobal Rank

HighThreat Impact

Identity

Unique IDELEMENT_GLOBAL.2.158655

Element CodePDAST1P0B0

Record TypeSPECIES

ClassificationSpecies

Classification StatusStandard

Name CategoryVascular Plant

Endemicendemic to a single state or province

KingdomPlantae

PhylumAnthophyta

ClassDicotyledoneae

OrderAsterales

FamilyAsteraceae

GenusCalycadenia

Concept Reference

Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.

Taxonomic Comments

All Calycadenias are actively evolving and are therefore "difficult" taxonomically. C. villosa may contain two or more subspecies (Bittman 1998).

Conservation Status

Rank MethodLegacy Rank calculation - Excel v3.1x

Review Date2017-09-13

Change Date2017-09-13

Edition Date2017-09-13

Edition AuthorsD. Gries, rev. R. Bittman (7/98); rev. R. Bittman (2013), rev. R. Bittman and Treher (2017)

Threat ImpactHigh

Range Extent5000-20,000 square km (about 2000-8000 square miles)

Number of Occurrences21 - 80

Rank Reasons

Endemic to California, Calycadenia villosa is known from sixty occurrences in Monterey and San Luis Obispo Counties. Forty-two of these occurrences are on Ft. Hunter-Liggett lands with little or no protection. Threats are urbanization, vehicle activity, and non-native plants.

Range Extent Comments

Endemic to California, occuring in Monterey and San Luis Obispo Counties. It is extirpated in Kern County.

Threat Impact Comments

Habitat loss around the San Antonio Resevoir is a threat, as is, urbanization, vehicle activity including ORVs, grazing, roads, military activities, fire, weeds, pigs, and non-native plants (CNPS 2001, CNDDB 2003). Cattle grazing may be a threat in the future (CNDDB 2003). Many sites occur on a military reservation (Ft. Hunter-Liggett) and may be threatened by military activities.

Ecology & Habitat

Habitat

Chaparral, cismontane woodland, meadows, valley and foothill grassland, dry, rocky hills and ridges.

Terrestrial Habitats

Forest/WoodlandForest - ConiferShrubland/chaparral

Other Nations (1)

United StatesN3

Province	Rank	Native
California	S3	Yes

Plant Characteristics

DurationANNUAL

Economic Value (Genus)No

Roadless Areas (3)

California (3)

Area	Forest	Acres
Black Mountain	Los Padres National Forest	16,818
Garcia Mountain	Los Padres National Forest	7,850
Machesna Mountain	Los Padres National Forest	12,271

References (6)

Bittman, R. 1998. Lead Botanist, California Natural Diversity Database. Unpublished notes on fifty rare plants of California for purposes of updating Element Global Ranking (EGR) forms. California Natural Heritage Division, Dep. of Fish & Game, Sacramento, California, U.S.A.
California Department of Fish and Game. 2000. Natural Diversity Database (RareFind 2), Version 2.1.2, January 25, 2000. Downloaded in 2003.
California Native Plant Society (CNPS). 2001. Inventory of Rare and Endangered Plants of California (sixth edition). Rare Plant Scientific Advisory Committee, David P. Tibor, Convening Editor. California Native Plant Society. Sacramento, CA. x + 388pp.
Hickman, J. C., ed. 1993. The Jepson manual: Higher plants of California. University of California Press, Berkeley, CA. 1400 pp.
Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
Skinner, M.W., and B.M. Pavlik, eds. 1997 (1994). Inventory of rare and endangered vascular plants of California. 1997 Electronic Inventory Update of 1994 5th edition, California Native Plant Society, Special Publication No. 1, Sacramento.