An illustrated flora of the 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 ed2illustratedflo02brit Year: 1913 20. POTERIDIUM Spach', Ann. Sci. Xat. 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-\vinged, its 4 lobes with scarious margins.
An illustrated flora of the 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 ed2illustratedflo02brit Year: 1913 20. POTERIDIUM Spach', Ann. Sci. Xat. 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-\vinged, 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 drj' calyx-tube. [Greek, diminutive of Poterium.] Two species, one of northwestern America and the following typical one. Poteridium annuum (Xutt.) Spach. Plains Poteridium. Fig. 2265. Poterium an: Sanguisorba Poteridium c • m Xutt. ; Hook. FI. Bor. Am. i : 198. 1832. nua Nutt.; T. &; G. Fl. X. A. i : 42Q. 1840. Spach. Ann. Sci. Xat. III. 5: 1846. Glabrous, 4'-i5' high. Leaflets 7-15, broadly obovate, 6' long or less, pectinate-pinnatifid, with linear-oblong segments; spikes li' long or less, about si' thick; bracts ovate, shorter than the flowe^s; calyx-lobes oval, apiculate. i' long: stamens usually 4; fruiting calyx- tube strongly 4-winged. Pla Arka and Texas. Summer. 21. POTERIUM L. Sp. PI. 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-lobed. 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 typical.
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