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Pitgland Tarweed
Holocarpha virgata
About Pitgland Tarweed (Holocarpha virgata) 0 Nurseries Carry This Plant Holocarpha virgata is a species of flowering plant in the aster family known by the common name yellowflower tarweed. It is endemic to California, where it is most common in the Central Valley and adjacent foothills to the east and west. There is also a disjunct population near San Diego. This is an annual herb producing an erect stem 20 centimeters to over one meter tall. It has many branches and is lined with oily glands and hairs. The linear leaves are up to 15 centimeters long near the base of the plant and those along the stem are much smaller. The flower cluster is made up of several short branches lined densely in small, thick, green leafs. The leafs are just a few millimeters long and are tipped with glands. At the ends of the branches are flower heads, each lined with phyllaries which are covered in knobby resin glands. The head contains many disc florets which are yellow with black or purplish anthers. The head has a fringe of several yellow ray florets which often have lobed tips.
Plant Description
Plant Type
Plant Type
Annual herb

0.7 - 4 ft tall

Flower Color
Flower Color

Landscaping Information
Full Sun

Natural Setting
Site Type
Site Type
Grassy places

Annual Precipitation: 4.4" - 47.4", Summer Precipitation: 0.16" - 1.43", Coldest Month: 29.3" - 61.4", Hottest Month: 58.5" - 88.8", Humidity: 0.51" - 42.79", Elevation: -76" - 6415"

Alternative Names
Common Names: Narrow Tarplant, Wand Tarbush, Yellowflower Tarweed

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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