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.
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