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Eriogonum cedrorum
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Cedars Buckwheat
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Eriogonum cedrorum

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About Cedars Buckwheat (Eriogonum cedrorum) Eriogonum cedrorum is a rare species of wild buckwheat known by the common name The Cedars buckwheat. It is endemic to Sonoma County, California where it is known only from The Cedars, an unincorporated area outside of Guerneville near Cazadero. The Cedars is known for its botanical riches, including the endemic plant species Cedars fairy lantern and serpentine fleabane. The habitat is a serpentine canyon surrounded by non-serpentine terrain and many rare serpentine-endemic plants are isolated within. Much of the flora is also adapted to alkaline conditions, growing among seeps of mineral-rich waters that can have a pH up to 11. This species of buckwheat was first collected in 1947 and described to science as a new species in 2009. It can be found in three locations with an estimated 1500 to 2000 individuals in existence. Eriogonum cedrorum is a mat-forming perennial herb growing up to half a meter wide with hairy or woolly herbage. It has a woody taproot and caudex unit covered in rosettes of leaves each up to 1. 5 centimeters long by 1 wide. The inflorescence arises on an erect stem up to 8 centimeters. The inflorescence itself is a cluster of yellow flowers that quickly turn dark red. The stamens are tipped with yellow anthers.
Plant Description
Plant Type
Perennial herb

Max. Height
0.8 - 3.1 in (2 - 7.9 cm)

Flower Color

Native Status
Natural Setting
Elevation ?
1334' - 1921'

Annual Precip. ?
69.5" - 71.0"

Summer Precip. ?
0.67" - 0.71"

Coldest Month ?
48.1° F - 49.1° F

Hottest Month ?
68.6° F - 69.2° F

Humidity ?
2.76 vpd - 16.24 vpd

Landscaping Information
Common uses
Butterfly Gardens, Bee Gardens

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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