This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol3", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
Herbs, some species woody, with opposite entire or dentate leaves, and terminal peduncled heads of both tubular and radiate, white or yellow flowers in our species. Involucre hemispheric, its bracts in 2 series, the 4 or 5 outer ones broad, often connate at the base, the inner hooded, embracing or permanently surrounding the pistillate fertile ray-flowers. Receptacle convex or conic, chaffy. Ray-flowers in 1 series, the rays spreading, 2-3-lobed or entire. Disk-flowers perfect, sterile, their corollas with a narrowly campanulate 5-toothed limb, the anthers entire at the base, the style undivided. Achenes obovoid, more or less incurved. Pappus none. [Greek, black-foot, of doubtful significance, but the stem bases of the typical species are dark-colored.]
About 35 species, natives of the warmer parts of America. Besides the following, 2 or 3 others occur in the southwestern United States. Type species: Melampodium americanum L.
Melampodium leucanthum T. & G. Fl. N. A. a: 271. 1842.
Perennial, woody at the base, branched, canes-cent, 4'-12' high, the branches slender. Leaves linear, lanceolate, or the lower spatulate, sessile, entire, or nearly so, canescent, 1'-2' long, 11/2'-3" wide, obtuse or obtusish at the apex; heads 1/2'-3/4' broad, terminating the branches; peduncles slender, 1 '-3' long; outer bracts of the involucre ovate or oval, obtuse, united below; rays 5-9, cuneate-oblong, white, 2-3-lobed, firm in texture, veiny, persistent; inner bracts turbinate or terete, hooded, muricate, the hood wider than the body.
In dry soil, Kansas to Colorado, Arizona, Texas and Mexico. June-Oct. Not distinguished, in our first edition, from M. cinereum DC. of Texas and northern Mexico.