. 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. 20. POTERIDIUM Spach, Ann. Sci. Nat. III. 5: 43. 1846. Annual or perennial herbs, with branched stems, stipulate, odd-pinnate leaves, the leaf- lets pinnatifid, and greenish perfect bracted flowers in dense oblong spikes. Calyx-tube urn-shaped, constricted at the mouth, 4-winged, its 4 lobes with scarious margins. Stamens 2 or 4; filaments short. Pistil i; styl
. 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. 20. POTERIDIUM Spach, Ann. Sci. Nat. III. 5: 43. 1846. Annual or perennial herbs, with branched stems, stipulate, odd-pinnate leaves, the leaf- lets pinnatifid, and greenish perfect bracted flowers in dense oblong spikes. Calyx-tube urn-shaped, constricted at the mouth, 4-winged, its 4 lobes with scarious margins. Stamens 2 or 4; filaments short. Pistil i; style terminal; stigma brush-like; ovule i, suspended. Achene enclosed in the dry calyx-tube. [Greek, diminutive of Poterium.] Two species, one of northwestern America and the following typical one. I. Poteridium annuum (Nutt.) Spach. Plains Poteridium. Fig. 2265. Poterium aiinuum Nutt. ; Hook. FI. Bor. Am. i : igS. 1832. Sanguisorba annua Nutt. ; T. & G. Fl. N. A. i : 429. 1840. Poteridium annuum Spach, Ann. Sci. Nat. III. 5: 43. 1846. Glabrous, 4'-is' high. Leaflets 7-15, broadly obovate, 6" long or less, pectinate-pinnatifid, with linear-oblong segments; spikes li' long or less, about 3i" thick; bracts ovate, shorter than the flowers; calyx-lobes oval, apiculate, i" long; stamens usually 4; fruiting calyx- tube strongly 4-winged. Plains, Kansas to Arkansas and Texas. 21. POTERIUM L. Sp. PL 994. 1753. Perennial herbs, with odd-pinnate, stipulate leaves, and small, perfect and imperfect flowers in dense heads. Calyx-tube 4-angled, constricted at the throat, 4-Iobed. Petals 4. Perfect flowers with several or numerous declined stamens, the filaments capillary. Pistils 2; 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 Please note that these images are extracted from scanned page images that may have b
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