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Calycadenia truncata
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Rosin Weed
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Calycadenia truncata

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About Rosin Weed (Calycadenia truncata) Calycadenia truncata is a species of flowering plant in the daisy family known by the common name Oregon western rosinweed. It is native to southwestern Oregon and northern and central California. It is found in the Cascades, the Coast Ranges, and the foothills of the Sierra Nevada as far south as Monterey and Tulare Counties. Calycadenia truncata is an annual herb producing an erect, reddish stem, which may exceed 100 cm (39 in) in height. The leaves are linear (long and very narrow) and up to 10 centimetres (3. 9 inches) long. The inflorescence bears one or more flower heads at separate nodes, surrounded by short bracts tipped with resin glands. The hairy flower heads have a center of many purple-tipped disc florets as well a few yellow ray florets. The fruit is an achene.
Plant Description
Plant Type
Annual herb

Max. Height
3.3 ft (1 m)

Native Status

Natural Setting
Elevation ?
26' - 14090'

Annual Precip. ?
15.3" - 86.0"

Summer Precip. ?
0.25" - 3.85"

Coldest Month ?
10.8° F - 51.1° F

Hottest Month ?
34.1° F - 76.0° F

Humidity ?
0.37 vpd - 25.32 vpd

Landscaping Information
Nursery Availability
Never or Almost Never Available

Other Names
Common Names
Oregon 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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