46 NORTH AMERICAN FLORA [VOLUME 17 
anthers, or longer; anthers of an oblong type. Carpels numerous, inserted on a convex or 
globose receptacle. Style apical; stigma simple. Achenes forming a bristly head, flat, or 
the body somewhat turgid, smooth-ribbed, beaked by the persistent, straight or curved style. 
Type species, Alisma rostratum Nutt. 
Fruit-bearing pedicels short, often very short, the fruit-heads approximate to the scape or ap- 
pressed to it, the inflorescence thus virgate. 
Leaf-blades more or less elongate, gradually narrowed into the petiole. 
Achene turgid, with a short stout beak which is sometimes hooked at the 
apex. 1. Z. Grisebachii. 
Achene flat, with a long slender incurved beak. 2. E, Andrieuxit, 
Leaf-blades broad, of an ovate type, cordate or subcordate at the base. 3. E. bracteatus, 
Fruit-bearing pedicels elongate, the fruit-heads borne away from the scape, the 
inflorescence thus lax. 
Leaf-blades narrowed at the base or shallowly cordate; sepals ribbed, 
scarcely accrescent, spreading or reflexed beneath the fruit-head. 
Achenes sessile ; foliage not muricate. 
Flowers, and fruit-heads, borne on stiff spreading pedicels. 4, E. cordifolius. 
Flowers, and fruit-heads, borne on pliable curved pedicels. 
Leaf-blades of an ovate type, truncate or shallowly cordate at the 
ase. 
Achene-body falcate, about 2 mm. long, the beak arising from 
the top of the body; bracts linear-lanceolate. 5. £. radicans, 
Achene-body cuneate-obovate, about 1.5 mm. long, the beak 
arising from the inner side of the body ; bracts ovate. 6. EZ. virgatus. 
Leaf-blades of an oblong or elliptic type, cuneate, often broadly so 
at the base. 7. E, ovals, 
Achenes stipitate ; foliage muricate. 8. EB, muricatus, 
Leaf-blades deeply cordate at the base ; ; sepals smooth, conspicuously accres- 
cent, enveloping the fruit-head. 9. E, tunicatus. 
1. Echinodorus Grisebachii Small. 
Echinodorus intermedius var. Griseb. Cat. Pl. Cub. 218. 1866. 
fz 
Leaf-blades oblong or elliptic, or ‘‘ ovate,’’ 3-11 cm. long, obtuse, 3-5-veined, gradually 
narrowed at the base, the petioles very variable in length, sometimes longer than the 
blades; scape often solitary, 3-4 dm. tall, the inflorescence virgate, raceme-like, the floral 
whorls few, remote, dense; bracts lanceolate; pedicels 2-6 mm. long, or rarely longer, 
recurved in fruit; sepals ovate or oval, 2.5-3 mm. long, obtuse, spreading in age; 
petals white, slightly longer than the sepals; fruit-heads 4-5 mm. in diameter; achenes 
1.5-2 mm. long, the body turgid, obovoid, prominently ribbed, the beak less than one half 
as long as the body. 
TYPE LOCALITY: Not given [Cuba]. 
DISTRIBUTION: Cuba. 
2. Echinodorus Andrieuxii (H. & A.) Small. 
Alisma Andricuxti H. & A. Bot. Beech. Voy. 311. 1837. 
Echinodorus ellipticus Micheli, in DC. Monog, Phan, 3: 51, in part. 1881. Not Alisma ellipii- 
cum Mart. 1830. 
Echinodorus ellipticus ovatus Buch. in Engler, Pflanzenreich 415: 34. 1903. 
Leaf-blades elliptic or oblong, 13-20 cm. long, obtuse, 5-9-veined, rather gradually 
narrowed at the base, the petioles mostly longer than the blades ; scapes commonly solitary, 
mostly 5-12 dm. tall, the inflorescence virgate, raceme-like, the floral whorls several, dense, 
remote; bracts lanceolate, attenuate; pedicels 8-14 mm. long, ascending in age; sepals 
broadly ovate, 4.5-6 mm. long, obtuse, spreading in age; petals white, twice or thrice as 
long as the sepals; fruit-heads ovoid, 6-8 mm. long; achenes 2.5-3 mm. long, the body 
cuneate or obovate-cuneate, flattish, strongly ribbed, the beak less than one half as long as 
the body. 
TYPE LOCALITY: Mexico. 
DISTRIBUTION : Mexico, 
3. Echinodorus bracteatus Micheli, in DC. Monog. 
Phan. 3: 59. 1881. 
Leaf-blades ovate, often broadly so, 25-35 cm. long, 7-11-veined, acute or acutish at 
the apex, shallowly and widely cordate at the base, the petioles elongate ; scape 2 m. tall 
