. 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. 13. Senecio tomentosus Michx. Woolly Ragweed. Ashwort. Fig. 4622. 5. tomentosus Michx. Fl. Bor. Am. 2: 119. 1803. Perennial, more or less densely and persistently tomentose or woolly-canescent; stems rather stout, solitary, or sometimes tufted, i°-2i° high. Basai and lower leaves ovate-lanceolate, oblong or rarely spatulate, long-petioled, erect, very obtuse, 2
. 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. 13. Senecio tomentosus Michx. Woolly Ragweed. Ashwort. Fig. 4622. 5. tomentosus Michx. Fl. Bor. Am. 2: 119. 1803. Perennial, more or less densely and persistently tomentose or woolly-canescent; stems rather stout, solitary, or sometimes tufted, i°-2i° high. Basai and lower leaves ovate-lanceolate, oblong or rarely spatulate, long-petioled, erect, very obtuse, 2'-6' long, 4-2' wide, crenate-dentate, narrowed or truncate at the base; stem leaves few and distant, small, linear-lanceolate or spatulate, crenate or rarely laciniate; heads several or numerous, co- rymbose, mostly long-peduncled, 8"-io" broad; involucre cylindric, or narrowly campanulate, its bracts linear-lanceolate, acute or acuminate, at length glabrate, with or without a few small outer ones; rays 10-15; achenes hispidulous, at least on the angles; pappus white. In moist soil, southern New Jersey to Florida, Louisiana, Texas and Arkansas. April-June. 14. Senecio plattensis Nutt. Prairie Rag- wort. Fig. 4623. S. plattensis Nutt. Trans. Am. Phil. Soc. (II) 7: 4i3- 1841. Perennial, similar to the preceding species, usu- ally smaller-leaved, lower and less tomentose, or becoming glabrate in age, seldom over ii° high. Basal leaves oval, ovate or oblong, some or all of them often more or less pinnatifid, with the termi- nal segment much larger than the lateral ones, crenulate or dentate, long-petioled; stem leaves mostly smaller than the basal ones, usually pin- natifid; heads several or numerous, compactly or loosely corymbose, conspicuously radiate. Indiana and Illinois to Ontario, North Dakota, Colo- rado, Missouri and Texas. AP"l-June. Senecio pseudotomentosus Mackenzie & Bush, of Missouri, differs in having the basal leaves mostly merely Pl
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
