Centromadia pungens

Centromadia pungens, the common spikeweed^[2] or common tarweed,^[3] is a species of North American plants in the tribe Madieae within the family Asteraceae. 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
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Asterids
Order:	Asterales
Family:	Asteraceae
Genus:	Centromadia
Species:	C. pungens
Binomial name
Centromadia pungens (Hook. & Arn.) Greene
Synonyms[1]
Centromadia maritima Greene Hartmannia pungens Hook. & Arn. Hemizonia pungens (Hook. & Arn.) Torr. & A.Gray

Centromadia pungens is an herb up to 120 cm (47 in) tall. It produces arrays of numerous yellow flower heads with both ray florets and disc florets.^[6][7][8]

Subspecies^[1]

• Centromadia pungens subsp. laevis (D.D.Keck) B.G.Baldwin - Baja California, southern California
• Centromadia pungens subsp. pungens - most of species range