Part 1, 1909] ALISMACEAE 49 
Leaf-blades imperfect or obsolete, the phyllodia thick or partially flat- 
tened; plants of salt or brackish water. 
Phyllodia terete or nearly so, prominently nodose-septate. 5. ZL. spongiosus. 
Phyllodia flat, more or less spatulate, not prominently nodose. 6. L. Spathulatus. 
Leaf-blades ovate to suborbicular with rounded or abruptly pointed broad basal 
lobes. : 7. L, guayanensis. 
1. Lophotocarpus fluitans. (Engeim.) J. G. Smith, Rep. Mo. Bot. 
Gard. 11: 145. 1899, 
Sagitlaria calycina fluitans Engelm. Bot. Mex. Bound. Surv. 212. 1859. 
Plants submerged ; leaves usually erect, mostly 1.5-5 dm. tall, the petioles slender, the 
blades linear, lanceolate, or sagittate, mostly 3-5 cm. long, or longer, including the basal 
lobes, which are shorter than the terminal lobe; scapes about as long as the leaves, with 
2 or 3 remote whorls ; fruit-bearing pedicels elongate, mostly 3-5 cm. long, shorter than the 
rachis-internodes ; fruit-heads about 8 mm. in diameter; achenes obovate, 2 mm. long, the 
beak minute, the dorsal wing thick and prominent. 
TYPE LOCALITY: Western Texas. 
DISTRIBUTION: Western Texas, New Mexico, and southern California. 
ILLUSTRATION : Rep. Mo. Bot. Gard. 11: p/. 57. 
2. Lophotocarpus californicus J. G. Smith, Rep. Mo. Bot. 
Gard. 11: 146. 1899. 
Plants submerged; leaves usually ascending, mostly 3-4 dm. tall, the petioles slender, 
the blades hastate or sagittate, 4-8 cm. long, or longer, including the divergent basal lobes, 
which are as long as the terminal lobe or shorter; scapes about as long as the leaves, with 
3-5 rather approximate whorls; sepals broadly ovate or suborbicular, becoming 6-9 mm. 
long; fruit-bearing pedicels short and thick, 1-2 cm. long, as long as the rachis-internodes 
or nearly so; fruit-heads 10-12 mm. in diameter; achenes cuneate or obovate-cuneate, 
nearly 2.5 mm. long, the beak minute, the dorsal wing broad and thick. 
TYPE LOCALITY: Coyote Creek, Los Angeles County, California. 
DISTRIBUTION : California. 
ILLUSTRATION : Rep. Mo. Bot. Gard, 11: £1. 54, 
3. Lophotocarpus depauperatus J. G. Smith, Rep. Mo. Bot. 
Gard. 11: 148. 1899, 
Plants mostly emersed; leaves 1.5-3 dm. tall, the petioles relatively slender, the 
blades oblong, elliptic, sagittate or hastate, 2-4 cm. long, including the basal lobes which 
are usually more or less spreading; scapes about one half as long as the leaves, mostly 
with 1 or 2 whorls; sepals suborbicular, becoming 6-7 mm. long; fruit-bearing pedicels 
rather stout, 1-3 cm. long; fruit-heads 7-8 mm. in diameter; achenes cuneate, fully 2 mm. 
long, or rarely shorter, the beak slender, the dorsal wing thin. 
TYPE LOCALITY: Missouri. a 
DISTRIBUTION : Wisconsin to Illinois, Missouri, and Oklahoma. 
ILLUSTRATION: Rep. Mo. Bot. Gard. 11: £2. 55. 
4, Lophotocarpus calycinus (Engelm.) J. G. Smith, Mem. Torrey 
Club 5: 25. 1894. 
Sagittaria calycina Engelm. Bot. Mex. Bound. Surv. 212. 1859. 
Sagittaria calycina maxima Engelm. Bot. Mex. Bound. Surv. 212, 1859. 
Sagittaria calycina media Rngelm. Bot. Mex. Bound. Surv. 212. 1859. 
Sagittaria calycina grandis Engelm. in A. Gray, Man. ed. 5. 494. 1867. 
Lophiocarpus calycinus Micheli, in DC. Monog. Phan. 3: 61. 1881. 
Lophotocarpus calycinus maximus B. I,. Robinson, in A. Gray, Man. ed. 7. 84. 1908. 
Plants mostly emersed; leaves 1.5-6 dm. tall, the petioles stout, the blades sagittate, 
hastate or lunate, 6-30 cm. long, the basal lobes usually longer than the broad terminal 
lobe, usually caudate-acuminate; scapes shorter than the leaves, the inflorescence usually 
simple, with 2-7 whorls; sepals suborbicular to orbicular-reniform, becoming 9-15 mm. 
long; fruit-bearing pedicels very thick, usually elongate, mostly 3-5 cm. long; fruit-heads 
