WATER-PLANTAIN FAMILY. 89 
4. Sagittaria arifolia Nutt. Arum-leaved Arrow-head. (Fig. 196.) 
Sagittaria sagtttaefolia var. minor Pursh, Fl. Am. Sept. 
Gatien "drifolia Nutt.; J. G. Smith, Ann. Rep. Mo. 
Bot. Gard. 6:32. pl. z. 18094. 
Glabrous or nearly so, terrestrial or partially sub- 
merged, scape weak, ascending, 8/20’ long. Leaves 
sagittate, broad, acute at the apex, about as long as the 
scape, their margins slightly curved, their basal lobes 
acute or acuminate, one-fourth to one-third the length 
of the blade; petioles usually curving outwardly ; 
bracts lanceolate, acute, usually equalling or longer 
than the fertile pedicels, often reflexed; filaments 
glabrous; petals 3’’-5’/’ long; achene cuneate-obovate, 
about 1’ long, winged on both margins, the sides 
smooth, the beak short, erect. 
Quebec to Minnesota and British Columbia, south to 
Michigan, western Kansas, New Mexico and California. 
Resembling in foliage the European SS. sagit/aefolia I,., 
but distinguished from that species by its achenes. 
5. Sagittaria cuneata Sheldon. Floating Arrow-head. (Fig. 197.) 
Sagittaria cuneata Sheldon, Bull. Torr. Club, 20: 283. 
pl. 159. 1893. 
Aquatic, submerged, rooting in sand, scape very 
slender, simple, terete, 1°-2° long, bearing the 
flowers at the surface of the water. Leaves long- 
petioled, the blade floating, sagittate, linear-lanceo- 
late, acuminate, 2’—4’ long, the basal lobes acumin- 
ate, about one-fourth its length ; phyllodia of two 
kinds, one petiole-like and as long as the leaves, 
the other lanceolate, and clustered at the base of 
the plant; bracts ovate-lanceolate, acute, 2//-3// 
long, much shorter than the slender fertile pedi- 
cels ; flowers 6//-8’’ broad ; achene only %” long, 
obovate-cuneate, its beak very short, erect. 
In shallow water, Minnesota to Washington and 
British Columbia. Aug.—Sept. 
6. Sagittaria longiloba Engeim. lLong- 
lobed Arrow-head. (Fig. 198.) 
Sagitlaria longiloba Engelm. in Torr. Bot. Mex. 
Bound. Surv. 212. 18509. 
Monoecious, glabrous, scape slender, simple or 
rarely branched, 1°-2° tall. Leaves long-petioled, 
the apex acute, the basal lobes linear-lanceolate, 
acuminate, about three-fourths the length of the 
blade; bracts lanceolate, acuminate, 3/’-4/’ long, 
much shorter than the very slender fertile pedicels 
which are longer than the sterile ones; stamens 
numerous, the filaments longer than the anthers; 
achene about 1’ long, quadrate-obovate, somewhat 
broader above than below, winged on both mar- 
gins, its beak exceedingly short. 
In shallow water, Nebraska to Colorado, south to 
Texas and Mexico. 
