. 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. 8. Nabalus asper (Michx.) T. & G. Rough White-lettuce. Fig. 4117. Prenanthes aspera Michx. Fl. Bor. Am. 2: 83. 1803. Nabalus asper T. & G. Fl. N. A. 2 : 483. 1843. Scabrous or rough-puberulent; stem virgate, simple, 2°-4° high. Leaves firm, oval, oblong, or oblanceolate, those of the stem all closely sessile, acute or acutish, dentate, denticulate, or t
. 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. 8. Nabalus asper (Michx.) T. & G. Rough White-lettuce. Fig. 4117. Prenanthes aspera Michx. Fl. Bor. Am. 2: 83. 1803. Nabalus asper T. & G. Fl. N. A. 2 : 483. 1843. Scabrous or rough-puberulent; stem virgate, simple, 2°-4° high. Leaves firm, oval, oblong, or oblanceolate, those of the stem all closely sessile, acute or acutish, dentate, denticulate, or the uppermost entire, the lower sometimes clasping, 2'-3' long, J'-i' wide, the basal tapering into winged petioles, commonly obtuse; heads very numerous, erect, spreading, or slightly drooping, Z"~4" broad, 12-16-flowered, in a long narrow thyrsus; involucre oblong, 2"-2i" thick, s"~7" high, very hirsute, its principal bracts 8-10, with several short outer ones; flowers light yellow; pappus straw-color. On dry prairies, Ohio to South Dakota, Nebraska, Ken- tucky, Louisiana and Kansas. Rattlesnake-root. Fig. 4118. 9. Nabalus racemosus (Michx.) DC. Glaucous White-lettuce. Prenanthes racemosa Michx. Fl. Bor. Am. 2: 83. 1803. Nabalus racemosus DC. Prodr. 7: 242. 1838. Nabalus racemosus pinnatifidus Britton; Britt. & Brown, 111. Fl. 3: 291. 1898. Prenanthes racemosus var. pinnatifida A. Gray, Syn. Fl. 1: Part 2, 433. 1884. Stem virgate, rather stout, glabrous and somewhat glaucous; stem striate, 2°-6° high. Leaves thickish, glabrous and glaucous, the lower and basal ones oval, oblong, oblanceolate, or obovate, dentate, denticulate, pinnatifid or pinnately lobed, 4'-8' long, mostly ob- tuse, tapering into long margined petioles; upper leaves sessile, smaller and partly clasping, lanceo- late to ovate-lanceolate, denticulate, entire, or pin- natifid, mostly acute; heads very numerous, erect, spreading, or slightly drooping, 12-16-flower
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
