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Dwarf Calycadenia Back to Plant Page
Calycadenia villosa

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About Dwarf Calycadenia (Calycadenia villosa) Calycadenia villosa is an uncommon species of flowering plant in the daisy family 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. There are perhaps 16 occurrences. 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 1 to 4 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.
Plant Description
Plant Type
Annual herb

Max. Height
1.3 ft (0.4 m)

Native Status
Natural Setting
Elevation ?
7' - 3550'

Annual Precip. ?
12.8" - 45.5"

Summer Precip. ?
0.18" - 0.56"

Coldest Month ?
41.0° F - 50.6° F

Hottest Month ?
63.6° F - 77.8° F

Humidity ?
0.85 vpd - 26.11 vpd

Landscaping Information
Nursery Availability
Never or Almost Never Available

Other Names
Common Names
Dwarf Western Rosinweed

Sources include: Wikipedia. All text shown in the "About" section of these pages is available under the Creative Commons Attribution-ShareAlike License. Plant observation data provided by the participants of the California Consortia of Herbaria, Sunset information provided by Jepson Flora Project. Propogation from seed information provided by the Santa Barbara Botanical Garden from "Seed Propagation of Native California Plants" by Dara E. Emery. Sources of plant photos include CalPhotos, Wikimedia Commons, and independent plant photographers who have agreed to share their images with Calscape. Other general sources of information include Calflora, CNPS Manual of Vegetation Online, Jepson Flora Project, Las Pilitas, Theodore Payne, Tree of Life, The Xerces Society, and information provided by CNPS volunteer editors, with special thanks to Don Rideout. Climate data used in creation of plant range maps is from PRISM Climate Group, Oregon State University, using 30 year (1981-2010) annual "normals" at an 800 meter spatial resolution.

Links:   Jepson eFlora Taxon Page  CalPhotos  Wikipedia  Calflora

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