. 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. 3. Thelesperrna gracile (Torr.) A. Gray. Rayless Thelesperrna. Fig. 4521. Bidens gracilis Torr. Ann. Lye. N. Y. 2 : 215. 1827. T. gracile A. Gray, Kew. Journ. Bot. 1: 252. 1849.' Perennial from a deep root; stem rigid, branched, i°-3° high, the branches nearly erect. Leaves rigid, erect or ascending, 2-3' long, pinnately or bipin- nately divided into linear seg
. 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. 3. Thelesperrna gracile (Torr.) A. Gray. Rayless Thelesperrna. Fig. 4521. Bidens gracilis Torr. Ann. Lye. N. Y. 2 : 215. 1827. T. gracile A. Gray, Kew. Journ. Bot. 1: 252. 1849.' Perennial from a deep root; stem rigid, branched, i°-3° high, the branches nearly erect. Leaves rigid, erect or ascending, 2-3' long, pinnately or bipin- nately divided into linear segments, or the upper linear and entire; heads 6"-io" broad; rays usually none, sometimes present and z"s" long; outer bracts of the involucre 4-6, ovate, mostly ob- tuse, very much shorter than the inner ones, which are united to the middle or beyond; disk yellow or brownish; outer achenes slightly papillose; pappus awns longer than the width of the summit of the achene. On dry plains, Nebraska and Wyoming to Texas, northern Mexico and Arizona. May-Aug. 74. GALINSOGA Cav. Icon. 3: 41. 1794. Annual branching herbs, with opposite, mostly petioled, dentate or entire leaves, and small peduncled heads of both tubular and radiate flowers, terminal and in the upper axils. Involucre hemispheric or broadly campanulate, its bracts in 2 series, ovate, obtuse, mem- branous, striate, nearly equal, or the outer shorter. Receptacle conic or elongated, its thin chaff subtending the disk-flowers. Ray-flowers white or red, pistillate, fertile, the rays 4 or S, short. Disk-flowers yellow, perfect, the corolla S-toothed. Anthers minutely sagittate at the base. Style-branches tipped with acute appendages. Achenes angled, or the outer ones flat. Pappus of the disk-flowers of several short laciniate or fimbriate scales, that of the ray-flowers of several or few short slender bristles, or none. [Named in honor of M. M. Galinsoga, superintendent of the Botanic Gardens at
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
