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.
Madiinae Access Page