WATER-PLANTAIN FAMILY. 89 



4. Sagittaria arifolia Nutt. Arum-leaved Arrow-head. (Fig. 196.) 



Sagittaria sagiltaefolia var. minor Pursh, Fl. Am. Sept. 



395. 1814 ? 

 Sagitlaria arifolia Nutt.; J. G. Smith, Ann. Rep. Mo. 



Bot. Card. 6 : 32. pi. I. 1894. 



Glabrous or nearly so, terrestrial or partially sub- 

 merged, scape weak, ascending, S'-ao' long. Leaves 

 sagittate, broad, acute at the apex, about as long as the 

 scape, their margins slightly curved, their basal lobes 

 acute or acumiuate, 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 i // 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 S. sagittaefolia I,., 

 but distinguished from that species by its achenes. 



5. Sagittaria cuneata Sheldon. Floating Arrow-head. (Fig. 197.) 



Sagittaria cuneata Sheldon, Bull. TOIT. Club, a*: sBj. 



pi. 159. 1893. 



Aquatic, submerged, rooting in sand, wrap* very 

 slender, simple, terete, i-2 long, bearing the 

 flowers at the surface of the water. Leaves long- 

 petioled, the blade floating, sagittate, linear-lanceo- 

 late, acuminate, I'-tf long, the basal lobes acumin- 

 ate, about one- fourth its length ; phyllodia of two 

 kinds, one petiole-like and as long as the leave*. 

 the other lanceolate, and clustered at the base of 

 the plant; bracts ovate-lanceolate, acute. 2"-$" 

 long, much shorter than the slender fertile pedi- 

 cels ; flowers 6"-8" broad ; achene only ft" long. 

 obovate-cuneate, its beak very short, erect. 



In shallow water. Minnesota to Washington and 



British Columbia. Aug. Sept. 



6. Sagittaria longiloba Engelm. Long- 

 lobed Arrow-head. (Fig. 198.) 



Sagitlaria longiloba Engelm. in Torr. Bot. Mex. 

 Bound. Surv. 212. 1859. 



Monoecious, glabrous, scape slender, simple or 

 rarely branched, i-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 // l n K. 

 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 i // loug, 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. 



