Centromadia pungens, the common spikeweed[2] or common tarweed,[3] is a species of North American plants in the tarweed tribe within the sunflower family. It is native to northern Baja California and the western United States (California, Oregon, Washington, Idaho, Nevada, Arizona). The plant is considered a noxious weed in parts of the Pacific Northwest.[4][5]

Centromadia pungens is an herb up to 120 cm (48 inches) tall. It produces arrays of numerous yellow flower heads with both ray florets and disc florets.[6][7][8]

  • Centromadia pungens subsp. laevis (D.D.Keck) B.G.BaldwinBaja California, southern California
  • Centromadia pungens subsp. pungens – most of species range
(from Wikipedia on 19.9.16)



Centromadia pungens
Common names: Common spikeweed, common tarweed,
Family: Asteraceae
Native of California, a small tufted herb with linear spiny leaves and about 2 cm across yellow radiate heads. 
Photographed from Fremont, California.  

This is very close to the plant I had posted earlier from Fremont a couple of years ago. Could you kindly have a look? Centromadia Species for sure.

Great to see a California native plant on this egroup! This was formerly Hemizonia pungens until Jepson Manual 2 revised it to Centromadia. One of the few flowering annuals during California’s dry summers. I see it where I live in San Jose in Lake Cunningham Park. Must be handled with extreme care due to the spiny leaves, esp when it dries out.

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