48 NORTH AMERICAN FLORA [VoLUME 17 
obovate, about 6-ribbed, the beak slender, about one third as long as the body, straight or 
slightly curved. 
TYPE LOCALITY : Mexico. 
DISTRIBUTION: Mexico. 
7. Echinodorus ovalis Wright, in Sauv. Anal. Acad. Ci. 
Habana 7: 564. 1871. 
Leaf-blades oblong or elliptic, 7-18 cm. long, rounded at the apex, 5-7-veined, cuneate, 
often broadly so, at the base; petioles elongate ; scapes 1 m. tall or less, the inflorescence 
lax, the floral whorls remote, loose ; pedicels mostly 2-3 cm. long; bracts lanceolate; sepals 
suborbicular or orbicular-obovate, 4-5 mm. long, spreading in age; petals white, about 
twice as long as the sepals; fruit not seen. . 
TYPE LOCALITY: Western Cuba. 
DISTRIBUTION : Cuba. 
8. Echinodorus muricatus Griseb. Bonplandia 6: 11. 1858. 
Echinodorus macrophyllus muricatus Micheli, in DC. Monog. Phan. 3: 50. 1881. 
Leaf-blades orbicular-ovate or orbiculat-reniform, mostly 3-4 dm. long, sometimes 
larger, obtuse at the apex, 13-17-veined, cordate at the base; petioles elongate, muricate, 
as is the leaf-blade; scapes 1 m. tall or more, widely paniculate, the floral whorls remote, 
lax; bracts lanceolate; pedicels 1.5-2.5 cm. long; sepals broadly ovate to suborbicular, 5-6 
mm. long, spreading at maturity; petals white, twice or thrice as long as the sepals; 
achenes about 3 mm. long, falcate, the body narrowed to both ends, the beak flat, broad, 
shorter than the body. 
TYPE LOCALITY: Panama. 
DISTRIBUTION : Panama and northern South America. 
9. Echinodorus tunicatus Small, sp. nov. 
Leaf-blades ovate, often narrowly so, 1-4 dm. long, obtuse at the apex, 11-13-veined, 
deeply cordate at the*base; petioles elongate, mostly much longer than the blades; scapes 
about 1 m. tall or less, rounded below, obtusely 3-angled above, the floral whorls remote, 
many-flowered ; bracts with ovate bases and elongate tips; pedicels 1-2.5 cm. long, recurv- 
ing in age; sepals (mature) suborbicular or reniform, 9-15 mm. long, converging over the 
fruit-head; fruit-heads much depressed, 11-13 mm. wide, nodding; achenes 2.5-3 mm. 
long, the body narrowly cuneate, prominently ribbed, the beak incurved, less than one half 
as long as the body. 
Type collected opposite Marraganti, Panama, April, 1908, R. S. Williams 991. 
DISTRIBUTION : Known only from the type locality. 
5. LOPHOTOCARPUS T. Durand, Index Gen. Phan. x. 1888. 
Lophiocarpus Miq. Fl. Arch. Ind. 12: 50. 1870. Not Lophiocarpus Turcz. 1843. 
Annual or perennial acaulescent aquatic or marsh herbs. Scapes simple at least below the 
inflorescence. Flowers polygamous, borne in several whorls of 2 or 3 at the top of the scape, 
the upper staminate, the lower perfect. Stamens 9-15; filaments flattened, inserted at the 
base of the receptacle. Carpels numerous, borne on a convex receptacle. Style slender, 
oblique. Achenes crowded together, crested or winged, more or less enveloped by the 
calyx. Embryo horseshoe-shaped. 
Type species, Sagittaria calycina Engelm. 
Leaf-blades narrowed at the base or hastate, with more or less divergent acuminate basal lobes. 
Scapes about as long as the leaves; achene with the dorsal wing thick. 
Fruit-bearing pedicels long (3-5cm.) and slender ; fruit-heads less than 
1 em. thick. . 1. L. fluitans. 
Fruit-bearing pedicels short (1-2 cm.) and thick ; fruit-heads over 1 cm. 
thick. 2. L. californicus. 
Scapes shorter than the leaves; achene with the dorsal wing thin. 
Leaf-blades hastate or sagittate ; plants of fresh-water ponds or marshes. 
Leaf-blades with small basal lobes shorter than the terminal lobe. 3. L. depauperatus. 
Leaf-blades with large basal lobes fully as long as the terminal one. 4. L. calycinus. 
