. 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 71. THISTLE FAMILY. 495 1. Bidens laevis (L.) Larger or Smooth Bur-Marigold. Brook Sun- flower. Fig. 4505. Helianthus laevis L. Sp. PI. 906. 1753. Bidens chrysanthemoides Michx. Fl. Bor. Am. 2 : 136. 1803. Bidens laevis Prel. Cat. N. Y. 29. 1888. Bidens lugens Greene, Pittonia 4: 254. 1901. Annual; glabrous throughout; stems branch- ed, erec
. 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 71. THISTLE FAMILY. 495 1. Bidens laevis (L.) Larger or Smooth Bur-Marigold. Brook Sun- flower. Fig. 4505. Helianthus laevis L. Sp. PI. 906. 1753. Bidens chrysanthemoides Michx. Fl. Bor. Am. 2 : 136. 1803. Bidens laevis Prel. Cat. N. Y. 29. 1888. Bidens lugens Greene, Pittonia 4: 254. 1901. Annual; glabrous throughout; stems branch- ed, erect or ascending, i°-3° high. Leaves sessile, lanceolate, evenly serrate or serrulate, acuminate at the apex, narrowed to the some- times connate-perfoliate base, 3'-8' long, l'-i' wide; heads numerous, short-peduncled, erect in flower, often declined in fruit, I'-24' broad; rays very showy, golden yellow; involucre hemispheric, its outer bracts linear-oblong or spatulate, equalling or exceeding the broader, ovate or oblong, membranous inner ones, shorter than the rays; rays 8-10, obovate- oblong, obtuse; achenes cuneate, truncate, 2"- 4" long, retrorsely hispid on the margins; pappus of 2-4 (usually 2), rigid downwardly barbed awns, shorter than the achene. In swamps and wet meadows, Massachusetts to Illinois, Kansas, Florida, Louisiana and Mexico. Northern records of this species apply to Bidens cernua. Bidens elegans Greene, of southeastern Virginia, appears to be a narrow-rayed race of this species. 2. Bidens cernua L. Smaller or Nodding Bur-Marigold. Fig. 4506. Bidens cernua L. Sp. PI. 832. 1753. Coreopsis Bidens L. loc. cit. 908. 1753. Annual; stems glabrous, or hispid, usually erect, branched, 3'-3° high. Leaves sessile and commonly somewhat connate-perfoliate at the base, lanceolate to oblong-lanceolate, usually coarsely and sharply serrate, glabrous, acuminate, 3'-6' long, J'-i' wide; heads numerous, globose, short-peduncled, i'-i' broad, nodding
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
