Taxonomic review is provided for taxa of Callitriche L. (Callitrichaceae) occurring in North America. One new species, C. stenoptera Lansdown, is described from Arizona in the United States, and the following names are lectotypified: C. anceps Fernald, C. drummondii Hegelmaier, C. hermaphroditica L. var. bicarpellaris (Fenley ex Jepson) H. Mason, C. longipedunculata Morong, C. marginata Torrey, C. nuttallii Torrey, C. sepulta S. Watson, and C. stenocarpa Hegelmaier.
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Vol. 19 • No. 3