大白花地榆

Sanguisorba sitchensis C. A. Meyer, Fl. Ochot. 34. 1856
Sanguisorba canadensis Cham. & Schlecht. l^innaea 2 : 32. 1827. Sanguisorba canadensis latifolia Hook. Fl. Bor. Am. 1 : 198. 1832. Poterium sitchense S. Wats. Bibl. Ind. 1 : 303. 1878. Sanguisorba latifolia Coville, Cont. U. S. Nat. Herb. 3: 339. 1896.
Glabrous perennial, with a strong rootstock; stem leafy, 2-12 dm. high, simple or branched above ; leaves odd-pinnate, 1-10 dm. long, the lower with 11-21 leaflets, the upper more reduced; stipules rounded, coarsely toothed ; leaflets 2-7 cm. long, 1.5-5 cm. wide, coarsely serrate with ovate teeth, rather thin, paler beneath, rounded at the apex, those of the lower leaves deeply cordate at the base ; petiolules often 1 cm. long ; spike 2-10 cm. long, with the stamens 1.5-2 cm. thick, at first lanceolate, in age cylindric; bracts
lanceolate, glabrous or ciliate ; sepals oval, 2.5-3 mm. long, white or slightly tinged with
purple; filaments 8-10 mm. long, flattened and dilated above, at the apex nearly 0.5 mm. wide.
Type locality : Sitka.
Distribution : Wet places, especially salt marshes, from Alaska and Yukon Territory to Idaho and Oregon.

Sanguisorba canadensis L. Sp. PL 117. 1753
Sanguisorba palustris Raf. Atl. Journ. 153. 1832. Poterium canadense A. Gray, Man. ed. 5. 150. 1867.
Glabrous perennial, with a strong rootstock ; stem leafy, 3-20 dm. high, simple or branched above ; leaves oddpinnate, 1-6 dm. long, the lower with 7-17 leaflets, occasionally with foliaceous stipels, the upper more reduced ; stipules adnate to the petioles, often leafy and oblique, coarsely serrate ; leaflets with petiolules 5-25 mm. long, oblong, varying to ovate-oblong or lance-oblong, sharply serrate, obtuse at the apex, rounded, truncate, or somewhat cordate at the base, 1-6 cm. long, 5-30 mm. wide, firm, dark-green above, paler beneath ; spike 3-15 cm. long, with the stamens 2 mm. thick, beginning to bloom at the base, therefore at first lanceolate and tapering to the apex ; bracts lanceolate, pubescent, about equaling the buds ; sepals oval, mucronate, white or greenishwhite, 3 mm. long ; filaments 6-8 mm. long, flattened and gradually dilated above, at the apex aoout 0.5 mm. wide, only a little narrower than the anthers ; fruit puberulent, rounded rhombic-ovoid, 4winged.
Type locality : Canada.
Distribution : Swamps from Labrador and Newfoundland to Georgia and Michigan.