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Glandular Big Tarweed
Blepharizonia laxa

About Glandular Big Tarweed (Blepharizonia laxa) Blepharizonia laxa is a California species of tarweed known by the common name glandular big tarweed. It is endemic to central California, where it grows in the Central Coast Ranges and adjacent areas of the southern San Francisco Bay Area and Central Valley, from Contra Costa County to as far south as San Luis Obispo County. Blepharizonia laxa is similar to its relative, B. plumosa. It tends, however, to be yellow-green rather than gray-green, and covered with many more stalked glands.
Plant Description
Plant Type
Annual herb

Flower Color

Native Status

Natural Setting
Elevation ?
19' - 4795'

Annual Precip. ?
7.3" - 29.6"

Summer Precip. ?
0.15" - 0.54"

Coldest Month ?
40.9° F - 51.8° F

Hottest Month ?
68.4° F - 78.1° F

Humidity ?
1.08 vpd - 26.03 vpd

Landscaping Information
Nursery Availability
Never or Almost Never Available

Other Names
Common Names

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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