. 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. COMPOSITAE. Vol. III. i. Megalodonta Beckii (Torr.) Greene. Water Marigold. Fig. 4518. Bidens Beckii Torr.; Spreng. Neue Entdeck. 2: 135- 1821. M. Beckii Greene, Pittonia 4: 271. 1901. M. nudata Greene, loc. cit. 1901. Stems simple, or little branched, 2°-8° long. Submersed leaves sessile, 1/-2' long, repeat- edly divided into numerous capillary segments; emers
. 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. COMPOSITAE. Vol. III. i. Megalodonta Beckii (Torr.) Greene. Water Marigold. Fig. 4518. Bidens Beckii Torr.; Spreng. Neue Entdeck. 2: 135- 1821. M. Beckii Greene, Pittonia 4: 271. 1901. M. nudata Greene, loc. cit. 1901. Stems simple, or little branched, 2°-8° long. Submersed leaves sessile, 1/-2' long, repeat- edly divided into numerous capillary segments; emersed leaves few, sessile, opposite, or some- times in 3's, lanceolate or oblong, acute, serrate or laciniate, i'-li' long; heads solitary or few, short-peduncled, l'-li' broad; involucre hemi- spheric, its bracts oval or oblong, obtusish, glabrous, the outer somewhat shorter than the inner; rays 6-10, obovate, or oblong, notched, golden yellow; achenes nearly terete, s"~7" long; pappus of 3-6 slender awns, downwardly barbed above, smooth below, divergent, 6"-i2" long. In ponds and streams, Quebec to New Jersey, west to Manitoba and Missouri. 73. THELESPERMA Less. Linnaea 6: 511. 1831. Glabrous annual or perennial herbs, with opposite linear and undivided, or finely dis- sected leaves, and long-peduncled heads of both tubular and radiate flowers, or the rays wanting. Involucre hemispheric or campanulate, of 2 distinct series of bracts, the outer short, narrow and somewhat spreading, the inner united nearly to or beyond the middle into a cup, their tips scarious-margined. Receptacle flat, chaffy, the 2-nerved broad; white scarious chaff subtending the disk-flowers and achenes. Ray-flowers, when present, neutral, the rays yellow, entire or toothed. Disk-flowers perfect, fertile, their corolla with a slender tube and S-toothed limb. Anthers obtuse and entire at the base. Style-tips acute. Achenes, some or all of them, papillose on the back, oblong or
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
