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Holocarpha virgata

Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Asterids
Cladus: Campanulids
Ordo: Asterales

Familia: Asteraceae
Subfamilia: Asteroideae
Tribus: Madieae
Subtribus: Madiinae
Genus: Holocarpha
Species: Holocarpha virgata

Holocarpha virgata (A.Gray) D.D.Keck, 1958

D.D.Keck, Aliso. a series of papers on the native plants of California. [Title originally El Aliso] 4:111. 1958


International Plant Names Index. 2018. Holocarpha virgata. Published online. Accessed: Feb. 22 2018.
The Plant List 2013. Holocarpha virgata in The Plant List Version 1.1. Published on the internet. Accessed: 2018 Feb. 22. 2018. Holocarpha virgata. Missouri Botanical Garden. Published on the internet. Accessed: 2018 Feb. 22.
Hassler, M. 2018. Holocarpha virgata. World Plants: Synonymic Checklists of the Vascular Plants of the World In: Roskovh, Y., Abucay, L., Orrell, T., Nicolson, D., Bailly, N., Kirk, P., Bourgoin, T., DeWalt, R.E., Decock, W., De Wever, A., Nieukerken, E. van, Zarucchi, J. & Penev, L., eds. 2018. Species 2000 & ITIS Catalogue of Life. Published on the internet. Accessed: 2018 Feb. 22. Reference page.
USDA, ARS, Germplasm Resources Information Network. Holocarpha virgata in the Germplasm Resources Information Network (GRIN), U.S. Department of Agriculture Agricultural Research Service. Accessed: 07-Oct-06.

Vernacular names
English: yellowflower tarweed

Holocarpha virgata is a species of flowering plant in the aster family known by the common names yellowflower tarweed, pitgland tarweed, and narrow tarplant.[3]


Holocarpha virgata is endemic to California, where it is most common in the San Joaquin Valley and Sacramento Valley of the Central Valley, and adjacent foothills of the Inner Coast Ranges and Sierra Nevada (U.S.).[4] There are additional populations in foothills of the Peninsular Ranges in San Diego County, western Riverside County, and Orange County.[3][5]

Holocarpha virgata is an annual herb producing an erect stem 20 centimetres (7.9 in) to over 1 metre (3.3 ft) tall. It has many branches and is lined with oily glands and hairs. The linear leaves are up to 15 centimetres (5.9 in) long near the base of the plant and those along the stem are much smaller.[5]

The inflorescence is made up of several short branches lined densely in small, thick, green bracts. The bracts 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. Each head contains 9-25 disc florets which are yellow with black or purplish anthers. The head has a fringe of 3-7 yellow ray florets which often have lobed tips.[5]


Holocarpha virgata subsp. elongata D. D. Keck - San Diego County, western Riverside County, and Orange County
Holocarpha virgata subsp. virgata - Central Valley, etc.


Tropicos, Holocarpha virgata (A. Gray) D.D. Keck
The Plant List, Holocarpha virgata (A.Gray) D.D.Keck
CalFlora taxon report, University of California: Holocarpha virgata
CalFlora: Distribution map . accessed 11.14.2013
Flora of North America: Holocarpha virgata

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