. 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. 16. Asclepias syriaca L. Common Milk- weed. Silkweed. Fig. 3398. Asclepias syriaca L. Sp. PI. 214. 1753. Asclepias Cornuti Dec. in DC. Prodr. 8 : 564. 1844. Stem stout, usually simple, 3°-S° high, finely pubescent at least above. Leaves oblong, oval or ovate, finely and densely pubescent beneath, soon glabrous above, acute or obtuse and cuspidate at the apex, o
. 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. 16. Asclepias syriaca L. Common Milk- weed. Silkweed. Fig. 3398. Asclepias syriaca L. Sp. PI. 214. 1753. Asclepias Cornuti Dec. in DC. Prodr. 8 : 564. 1844. Stem stout, usually simple, 3°-S° high, finely pubescent at least above. Leaves oblong, oval or ovate, finely and densely pubescent beneath, soon glabrous above, acute or obtuse and cuspidate at the apex, obtuse, narrowed or subcordate at the base, 4-9' long, ' wide, the primary nerves wide-spreading; petioles stout, 3"-8" long; umbels several or numerous ; peduncles pubescent or tomen- tose, ii'-3i' long; pedicels 1-2'long; corolla green- purple or greenish-white, its segments oblong-lan- ceolate, 3"-4" long; column short and thick, the hoods ovate-lanceolate with a tooth on each side, longer than the anthers and the incurved horn; fol- licles 3'-s' long, erect on recurved pedicels, tomen- tose and covered with short soft processes. In fields and waste' places, New Brunswick to- Sas- katchewan, North Carolina and Kansas. Leaves rarely lanceolate. Silky swallow-wort. Virginia silk. Wild cotton. June-Aug. Asclepias kansana Vail, of Kansas, differs by erect-spreading hoods of the corolla and more densely tomentose follicles. 17. Asclepias speciosa Torr. Showy Milk- weed. Fig. 3399. Asclepias speciosa Torr. Ann. Lye. N. Y. 2: 218. 1826. A. Douglasii Hook. Fl. Bor. Am. 2: 53. pi. 152. 1834. White-tomentose or canescent all over, or gla- brate below, pale; stem simple, stout, i°-2l° high. Leaves thick, broadly ovate or oval, obtuse and cus- pidate or acute at the apex, subcordate, rounded or narrowed at the base, petioled, 3'-8' long, 2'-4' wide; peduncles i'-3' long; umbels several or rarely soli- tary, many-flowered; pedicels stout, c/'-i8" long; co
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
