Centromadia Greene

Last Addition: July 26, 2000.  Each "thumbnail" image below is linked to a larger photograph.

Centromadia includes three annual and one perennial species with spine-tipped leaves.  Species of Centromadia occur in and around the Central Valley of California S to Baja California.  Plants 1-12 dm high.  Heads radiate; phyllaries many, spine-tipped, each half enclosing a ray ovary; receptacular chaff scattered;  ray florets pistillate, the corollas yellow or becoming red; disk florets many, mostly staminate, the corollas yellow or becoming red; anthers black or yellow; (ray) cypselae beaked; ray pappus absent;  disk pappus absent or comprising 3-12 scales.  Chromosome numbers in the genus are n = 9, 11, 12, 13.

Centromadia perennis

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