. An illustrated flora of the northern United States, Canada and the British possessions, from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian. Botany; Botany. Genus 49. THISTLE FAMILY. 459. 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. i. Melampodium leucanthum T. & G. Plains Melampodium. Fig. 4419. Melampodium leucanthum T. & G. Fl. N. A. 2: 271. 1842. Perennial, woody at the base
. An illustrated flora of the northern United States, Canada and the British possessions, from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian. Botany; Botany. Genus 49. THISTLE FAMILY. 459. 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. i. Melampodium leucanthum T. & G. Plains Melampodium. Fig. 4419. Melampodium leucanthum T. & G. Fl. N. A. 2: 271. 1842. Perennial, woody at the base, branched, canes- cent, 4'-i2' high, the branches slender. Leaves linear, lanceolate, or the lower spatulate, sessile, entire, or nearly so, canescent, 1-2' long, ii"-3" wide, obtuse or obtusish at the apex; heads i'-i' broad, terminating the branches; peduncles slen- der, i'-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, hood- ed, 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. 50. ACANTHOSPERMUM Schrank, PI. Rar. Hort. Monac. pi. 53. 1819. Annual rather coarse herbs, with pubescent foliage and erect or creeping stems, opposite, broad, often leathery, toothed leaves, and radiate but inconspicuous heads, axillary to leaf- like bracts. Involucre double, an outer one of flat herbaceous bracts, and an inner one of several smaller bracts which become bur-like and fall away enclosing an achene at maturity. Receptacle concave or convex. Ray-flowers few, in I series, the rays very small, yellowish, concave or hooded. Disk-flowers perfect, sterile. Anthers entire at the base. Achenes broadest above the middle, slightly curved. Pappus wanting. [Greek, thorn-seed, from the prickly, bu
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
