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 102nd meridian . the following, 2 native speciesoccur in the southeastern United States. Type spe-cies: Cynanchmn acutiun L. I. Cynanchum nigrum (L.) Pers. BlackSwallow-wort. Fig. 3415. Asclepias nigra L. Sp. PI. 216. nigrum Moench, Meth. 317. nigrum Pers. Syn. i : 274. 1805. Twining, or at first erect, puberulent, slender,2°-5° high. Leaves ovate or ovate-lanc
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 102nd meridian . the following, 2 native speciesoccur in the southeastern United States. Type spe-cies: Cynanchmn acutiun L. I. Cynanchum nigrum (L.) Pers. BlackSwallow-wort. Fig. 3415. Asclepias nigra L. Sp. PI. 216. nigrum Moench, Meth. 317. nigrum Pers. Syn. i : 274. 1805. Twining, or at first erect, puberulent, slender,2°-5° high. Leaves ovate or ovate-lanceolate, en-tire, thin, acuminate at the apex, rounded at thebase, pinnately veined, petioled, 2-$ long. ^-2¥wide; petioles 2-i2 long; pedicels ii-3 long;flowers dark purple, about 2h broad; corolla-segments pubescent within; crown fleshy, 5-lobed ;follicles on nearly straight fruiting pedicels, about2 long, glabrous. In waste places, escaped from gardens, Massa-chusetts to Pennsylvania and Ohio and in BritishColumbia. Introduced from Europe. June-Sept. Cynanchum Vincetoxicum (L.) Pers., with green-ish-white glabrous corollas, another Old Worldspecies, is recorded as escaped from cultivation insouthern
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
