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; 2nd ed. . eaf-lets pinnatifid, and greenish perfect bracted flowers in dense oblong spikes. Calyx-tubeurn-shaped, constricted at the mouth, 4-winged, its 4 lobes with scarious margins. Stamens2 or 4; filaments short. Pistil i; style terminal: stigma brush-like; ovule. I, enclosed in the dr\- calyx-tube. [Greek, diminutive of Poterium.] Two species, one of north
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; 2nd ed. . eaf-lets pinnatifid, and greenish perfect bracted flowers in dense oblong spikes. Calyx-tubeurn-shaped, constricted at the mouth, 4-winged, its 4 lobes with scarious margins. Stamens2 or 4; filaments short. Pistil i; style terminal: stigma brush-like; ovule. I, enclosed in the dr\- calyx-tube. [Greek, diminutive of Poterium.] Two species, one of northwestern America and the following typical one. I. Poteridium annuum (Xutt.) Spach. PlainsPoteridium. Fig. 2265. Polcritim annuum Nutt. ; Hook. Fl. Bor. Am. i : 198. 183^. Sanguisorba annua Xutt.; T. & G. FI. \. .\. i : 429. 1840. Poteridium annuum Spach. Ann. Sci. Xat. III. 5: 43. 1846. Glabrous, 4-ls high. Leaflets 7-15, broadly obovate,6 long or less, pectinate-pinnatifid. with linear-oblongsegments; spikes il long or less, about 3* thick;bracts ovate, shorter than the flowers; calyx-lobes oval,apiculate. l long: stamens usually 4; fruiting calyx-tube strongly 4-winged. Plains, Kansas to .Arkansas and Texas. 21. POTERIUM L. Sp. PI. 994. 1753. Perennial herbs, with odd-pinnate, stipulate leaves, and small, perfect and imperfectflowers in dense heads. Calyx-tube 4-anBled, constricted at the throat, 4-lobed, Petals flowers with several or numerous declined stamens, the filaments capillan,-. Pistils2; style terminal; stigmas brush-like. Achene enclosed in the thickened, 4-angled calyx-tube. Seed suspended. [Greek, goblet or beaker.] About four species, natives of the Old World, the following typical. 266 ROSACEAE.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
