Centromadia pungens

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
Scientific classification
Kingdom:	Plantae
(unranked):	Angiosperms
(unranked):	Eudicots
(unranked):	Asterids
Order:	Asterales
Family:	Asteraceae
Tribe:	Madieae
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

References

1. The Plant List Centromadia pungens (Hook. & Arn.) Greene
2. "BSBI List 2007". Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-01-25. Retrieved 2014-10-17.
3. "Centromadia pungens". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 5 June 2015.
4. Biota of North America Program 2014 county distribution map
5. Calflora taxon report, University of California, Centromadia pungens (Hook. & Arn.) Greene, common tarweed
6. Flora of North America, Spikeweed, Centromadia Greene
7. Greene, Edward Lee 1894. Manual of the Botany of the Region of San Francisco Bay 196
8. Torrey, John & Gray, Asa 1843. Flora of North America 2(3): 399

External links

• Calflora Database: Centromadia pungens (Common spikeweed, Common tarweed)
• Jepson eFlora (TJM2): Centromadia pungens
• USDA Plants Profile for Centromadia pungens (common tarweed)