Wolffia columbiana H.Karst.

PLANTAE EXSICCATAE GRAYANAE
173. Wolffia columbiana Karst.
Bot. Unters, i. 103 (1865); Hegelm. Lemnac. 122,
t. 1, figs. 1-13; Thompson, Rep. Mo. Bot. Gard. ix.
41, t. 4, fig. F; Britton & Brown, 111. FI. ed. 2, i. 449,
fig. 1127.
On wet mud in slough near Dutcher’s Bridge,
Salisbury, Connecticut.
Coll. M. L. Fernald.
September 6, 1909.
03700827