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Calycadenia fremontii
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Fremont's Western Rosinweed
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Calycadenia fremontii

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About Fremont's Western Rosinweed (Calycadenia fremontii) Calycadenia fremontii is a species of flowering plant in the daisy family known by the common name Fr mont's western rosinweed (after John C. Fr mont). It is native to southwestern Oregon (Josephine + Jackson Counties) and northern California (mostly north of Napa and Placer Counties but with a few isolated populations in Santa Clara and Tuolumne Counties). It is a common member of the flora in several types of habitat in the mountains, foothills, and valleys. This annual plant is variable in appearance. Calycadenia fremontii produces a rigid, erect, hairy stem reaching a top height anywhere between 10 centimeters (2 inches) and one meter (40 inches). The leaves are linear in shape and arranged alternately along the stem, especially on the lower part. The largest is up to 8 centimeters long. The inflorescence bears one or more glandular flower heads, each with 2 to 6 three-lobed ray florets in shades of white to red to yellow, and up to 20 disc florets at the center. The fruit is an achene; achenes from the disc florets may have a pappus of scales.
Plant Description
Plant Type
Annual herb

Max. Height
4 in (10.2 cm)

Flower Color
White, Yellow

Native Status

Natural Setting
Elevation ?
180' - 5802'

Annual Precip. ?
12.3" - 117.4"

Summer Precip. ?
0.32" - 3.43"

Coldest Month ?
31.1° F - 50.1° F

Hottest Month ?
57.8° F - 76.3° F

Humidity ?
0.35 vpd - 26.50 vpd

Landscaping Information
Nursery Availability
Never or Almost Never Available

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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