REVISION OF THE SPECIES OF LOPHOTOCARPUS. 147 
verticils 1.5-2 cm. apart, and more broadly winged achenia, 
although mature specimens have not been seen. It is most 
closely related to L. fluitans, from which it differs in hav- 
ing widely divergent basal lobes, usually shorter than the 
middle one, more verticils less widely separated, larger 
fruiting head, shorter fertile pedicels, and more broadly 
winged and prominently beaked achenes. 
Loruorocarrus caLycrnus (EnGELM). Sagittaria caly- 
cina Engelm. Torr. Bot. Mex. Bound. Surv. 212. 
1859. 
Leaves floating or ascending, 1.5-4dm. high. Blades en- 
tire, hastate, sagittate, or triangular crescent-shaped, dorsal 
lobes usually widely divergent, 8-16 cm. long, 5-25 cm. 
wide, rounded, obtuse or acute at the apex. Basal lobes 
often much longer than the middle one. Scape shorter 
than the petioles, simple, weak, at length decumbent. Ver- 
ticils 2-6; fertile pedicels very thick, recurved in fruit, 
equaling or longer than the slender sterile ones. Achenes 
obcuneate, truncate, 2-2.5 mm. long, narrowly winged on 
the margins, with a short, horizontal, triangular beak. In 
fresh water bogs and marshes, South Dakota to Louisiana 
and New Mexico, eastward to Delaware. Type specimens 
in the Engelmann Herbarium. July-September. 
: Specimens examined from South Dakota (No. 7, Potter, 1892; No. 3, 
Griffiths, Bangor, Sept. 18, 1892; No. 5 and 14, T. A. Williams, Canning, 
Aug. 16, 1892); Michigan (J. Schneck, Grand Rapids, Aug. 24, 1881); 
Nebraska (No. 307, T. A. Williams, Greenwood, July 16, 1890); Kansas 
(Mark White, Cowley Co., 1898; No. 535, Hitchcock, Finney Co., Aug. 
13, 1895); New Mexico (No. 74, Wooton, Mesilla, July 2, 1897); Missouri 
(Dr. George Engelmann, various localities around St. Louis; Bush, 404, 
Courtney, Oct. 11, 1896, and 675, Watson, 1894; Hilgard, St. Louis, 1870; 
Eggert, St. Louis, 1877); Illinois (E. Hall, Athens, and Sangamon River, 
Sept., 1861, and Athens, Sept., 1865; Hitchcock, Cahokia, Aug. 13, 1890) ; 
Louisiana (Josiah Hale, Alexandria, the type of Sagittaria calycina 
maxima Engelm., with paniculate inflorescence and broadly triangular 
leaf-blades 30 cm. wide); Delaware (A. Commons, Delaware City, Sept. 
18, 1894). Sagittaria calycina media Engelm., collected in saline ponds 
along the Meramec river near St. Louis, Mo., July, 1856, ouly differs in 
having crescent-shaped leaves, rounded at the apex. 
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