Calycadenia villosa

Calycadenia villosa is an uncommon species of flowering plant in the family Asteraceae known by the common name dwarf western rosinweed. It is endemic to central California, where it is known from a limited distribution in the Central Coast Ranges in Monterey County and San Luis Obispo County, with a few populations in Santa Barbara and western Fresno Counties.[3] There are perhaps 16 occurrences.[4][5][6]

Calycadenia villosa
Herbarium specimen

Vulnerable  (NatureServe)[1]
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Calycadenia
Species:
C. villosa
Binomial name
Calycadenia villosa
Synonyms[2]
  • Hemizonia douglasii A.Gray

Calycadenia villosa is an annual herb producing a very hairy erect stem approaching 40 centimeters (16 inches) in height. The leaves are linear (long and narrow) and up to 5 centimeters (2 inches) long. The inflorescence is made up of clusters of flower heads surrounded by gland-tipped bracts. Each flower head is a hairless bunch of small disc florets and one to four white to pink ray florets. Each ray floret has three lobes, the middle lobe being narrowest. The fruit is an achene; those developing from disc florets bear a pappus of scales.[7]

References
  1. "NatureServe Explorer 2.0".
  2. The Plant List, Calycadenia villosa DC.
  3. Center for Plant Conservation
  4. The Nature Conservancy
  5. Biota of North America Program 2014 county distribution map
  6. Calflora taxon report, University of California, Calycadenia villosa DC. dwarf calycadenia
  7. Flora of North America, Calycadenia villosa


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