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Calycadenia oppositifolia
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Butte County Calycadenia
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Calycadenia oppositifolia

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About Butte County Calycadenia (Calycadenia oppositifolia) Calycadenia oppositifolia is a species of flowering plant in the daisy family known by the common name Butte County western rosinweed. It is native primarily to Butte County, California, although a few populations have been found in other parts of the state. It grows in the foothills of the high mountain ranges. Calycadenia oppositifolia is an annual herb producing an erect, unbranching, hairy stem approaching 30 centimeters (12 inches) in maximum height. The leaves are linear in shape and up to 5 centimeters (2 inches) long, arranged oppositely about the stem. The inflorescence bears bracts coated in large resin glands and dense clusters of flower heads. The hairy, glandular flower head has a center of several disc florets surrounded by a few white or reddish triple-lobed ray florets. Each ray floret has three lobes at the tip, the middle lobe being shortest. The fruit is an achene; those developing from the disc florets have a pappus of scales.
Plant Description
Plant Type
Annual herb

Max. Height
1 ft (0.3 m)

Flower Color

Native Status
Natural Setting
Elevation ?
181' - 4911'

Annual Precip. ?
16.9" - 71.8"

Summer Precip. ?
0.29" - 1.86"

Coldest Month ?
39.4° F - 52.2° F

Hottest Month ?
62.8° F - 75.8° F

Humidity ?
1.22 vpd - 24.69 vpd

Landscaping Information
Nursery Availability
Never or Almost Never Available

Other Names
Common Names
Butte County 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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