88 ALISMACEAE. 
1. Sagittaria longiréstra (Micheli) J. G. Smith. Long-beaked Arrow-head. 
(Fig. 193.) 
Sagittaria sagittaefolia var. longirostra Mi- 
cheli in DC. Monog. Phan. 3: 69. | 1881. 
Sagittaria eal G. Smith, Mem. Torr. 
Club, 5: 1894. 
Monoecious, glabrous, scapes erect, rather 
stout, 14°-3° tall. Leaves broad, sagittate, 
4/-12’ long, abruptly acute at the apex, the 
basal lobes ovate or ovate-lanceolate, acute, 
one-third to one-half the length of the blade ; 
scape usually longer than the leaves, 6- 
angled below; bracts triangular-lanceolate, 
acuminate, 7’’-15’’ long, longer than the 
fertile pedicels; petals 8’’-14’’ long; fila- 
ments glabrous ; styles curved, twice as long 
as the ovaries; achene obovate, about 2/7 
long, winged on both margins, the ventral 
margin entire or undulate, the dorsal eroded, 
its sides with a short crest, its beak stout, 
erect or somewhat recurved. 
Inswampsand along ponds. New Jersey and 
Pennsylvania to Alabama. July—Sept. 
' 
}W 
2 Sagittaria Engelmanniana J. G. Smith. 
Engelmann’s Arrow-head. (Fig. 194.) 
Sagittaria variabilis var. (?) gracilis S, Wats. in A. Gray, 
Man. Ed. 6, 555. 1889. Not Engelm. 
Sagitiaria Engelmanniana J. G. Smith, Mem. Torr. Club, 5: 
25. 1894. 
Monoecious, glabrous, scape erect or ascending, slen- 
der, 8’-20’ high. Leaves narrow, 1%/-8’ long, 1//-4/” 
wide, acute or obtuse at the apex, the basal lobes nar- 
rowly linear, acuminate, one-third to one-half the length 
of the blade; scape striate, about as long as the leaves; 
bracts lanceolate, acute, shorter than the slender fertile 
pedicels, 4/’-6’’ long; flowers 7’/-12’’ broad; filaments 
glabrous ; style about twice as long as the ovaries; achene 
obovate, 2’’ long, winged on both margins and with 1-3 
lateral wing-like crests on each face, the beak short, 
stout, erect, about 14’ long. 
In shallow water, Massachusetts to Delaware, near the 
coast, probably extending further south. Aug.—Sept. 
3. Sagittaria latifolia Willd. Broad-leaved Arrow-head. (Fig. 195.) 
Sagtttaria latifolia Willd. Sp. Pl. 4: 409. 1806. 
Sagittar ta variabilis Engelm. in A. Gray, Man. 461. 1848. 
Monoecious or sometimes dioecious, glabrous or nearly 
so, scape stout or slender, 4’—4° tall, simple or branched. 
Leaves exceeding variable in form and size, sometimes 
linear-lanceolate and acuminate at the apex, sometimes. 
wider than long and obtuse; basal lobes from { to 4 as 
long as the blade; bracts acute, acumiuate or obtuse, the 
upper ones sometimes united; flowers 1/-114’ wide; 
filaments slender, glabrous; achene 1//-2’’ long, broadly 
winged on both margins, its sides even or 1-ribbed, the 
beak about one-third its length, horizontal or nearly so. 
In shallow water, throughout North America, except the 
extreme north, extending to Mexico. Variable. July-Sept. 
Sagittaria latifolia pubéscens (abl. I. G. Smith, Mem. Torr. 
Club, 5 : 26. 
Sagittaria pubescens Muhl. Cat. 86. 1813. 
Whole plant pubescent, varying from merely puberulent to: 
densely hirsute. Ontario to New Jersey, Florida and Alabama, 
