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HERBARIUM
OF
YALE UNIVERSITY

Yale University Herbarium

YU.027207

PLANTAE EXSICCATAE GRAYANAE

827. Spirodela polyrhiza (L.) SCHLEID.

In Linnaea, xiii. 392 (1839); Watson & Coulter in Gray, Man. ed. 6, 552 (1890); Britton & Brown, Ill. Fl. i. 365, fig. 884 (1896); Thompson in Ann. Rep. Mo. Bot. Gard. ix. 27, t. 1, fig. A (1897); Small, Fl. Se. U. S. 250 (1903); Hegi, Fl. Mitt.-Eu. ii. 141 (1909); Rydb. Fl. Rocky Mts. 144 (1918); Abrams, Ill. Fl. Pacif. St. i. 346, fig. 846 (1923); Saeger in Bull. Torr. Bot. Club, lvi. 351 (1929); Victorin, Fl. Laurent. 847, fig. 322 (1955).

Syn. *Lemna polyrhiza* L. Sp. Pl. 970 (1758); Gray Man. 450 (1848); Macoun, Cat. Canad. Pl. pt. iv, 75 (1888). *L.umbonata* A.Br. ex Hglm. Mon. Lemnac. 156 (1868).

Sheltered cove, Horn Pond, Woburn, Middlesex County,
MASSACHUSETTS.

Coll. L.B.SMITH, S.K.HARRIS.

July 10, 1938.