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REVISION OF THE SPECIES OF LOPHOTOCARPUS OF THE 
UNITED STATES: AND DESCRIPTION OF A NEW SPECIES 
OF SAGITTARIA. 
BY JARED G. SMITH. 
LOPHOTOCARPUS. 
ANALYTICAL KEY TO SPECIES. 
Petioles and scapes about equal, very slender; leaves hastate; dorsal 
wing of the mature achene inflated. 
Fertile pedicels 3-5 cm. long, very slender, shorter than the 2 or 3 
internodes; beak of the achenia very short. L. fluitans. 
Fertile pedicels equaling the internodes; verticils 5 or more. 
L. Californicus. 
Petioles thick and spongy, longer than the weak, ascending or at length 
decumbent scape; dorsal wing of the achene thin, flat, not inflated. 
Leaves with sagittate or hastate blades, seldom bladeless. Plants 
growing in fresh water ponds and marshes, 
Basal lobes of the leaves widely divergent: large plants, 2-6 dm. 
high. L. calycinus, 
Basal lobes not widely divergent: low plants, 1-1.5 dm. high. 
L. depauperatus. 
Leaves mostly bladeless phyllodia. Submerged seashore and tidal flat 
aquatics. 
Phyllodia thick, spongy, nodose, 1-3 dm. long. L. spongiosus. 
Phyllodia flat, spatulate, not nodose, 3-7 cm. high. L. spatulatus. 
LoPpHOTOCARPUS FLUITANS (Engelm.). Sagitiaria caly- 
cina fluitans Engelm. in Torr. Bot. Mex. Bound. 
Surv. 212. 1859. 
Submerged aquatic with very slender erect petioles 3-5 
dm. high. Mature leaves sagittate, 6-8 cm. long, acute, 
the basal lobes shorter or longer than the middle one, 
2.5-5 em. long, 5-6 mm. wide, the middle lobe lanceolate, 
acute, 3.5-5 cm. long, 10-15 mm. wide; basal lobes some- 
times very short, or obsolete (when the blade is linear-lan- 
ceolate), obtuse at the apex, and rounded or truncate at the 
Separates issued September 27, 1899, 10 1 
