Last Addition: July 26, 2000. Each "thumbnail" image below is linked to a larger photograph.
Madia is a genus of 10 annual, commonly ruderal species distributed widely in western North America, Chile, and Argentina. Plants 0.1-25 dm high. Heads generally radiate, phyllaries (0)1 - 21, equaling the number of ray florets, enclosing the ray ovaries and falling with the mature cypselae; ray florets pistillate, corolla commonly yellow or yellowish, sometimes tinged or spotted with maroon or purple, the tube 0.5 - 5 mm long, the limb 0.7 - 20 mm long, 2-3-lobed; receptacular chaff peripheral, generally more or less fused in a ring; disk florets 1 - 65, perfect or staminate, the corolla 1.3 - 5.5 mm long, similar in color to rays, the anthers black or yellow; ray cypselae compressed or 3-angled, epappose; disk cypselae (where present) similar to those of ray florets or less angular and less compressed, epappose. Chromosome numbers of n = 8, 14, 16, and 24 have been recorded for the genus.
|M. elegans. 1, 2, Ventana Wilderness, Santa Lucia Mts., Monterey Co., CA.; 3, "densiflora"; 4, Butte Co., CA.; 4,|
|M. exigua, cultivated.|
|M. radiata, Bitterwater Rd., near Pinole Spring, San Luis Obispo Co., CA.|
|M. sativa. 1, habit of plant in Haleakala Crater, Maui; 2, Cambria, CA.; 3, close-up of heads of cultivated plant.|
Madiinae Access Page