88 



ALISMACEAE. 



i. Sagittaria longirostra (Micheli) J. G. Smith. 



Long-beaked Arrow-head. 

 (Fig. 193.) 



Sag it f aria sagittaefolia var. longirostra Mi- 

 cheli in DC. Monog. Phan. 3 : 69. 1881. 



Sagittaria longirostra J. G. Smith, Mem. Torr, 

 Club, 5 : 26. 1894. 



Monoecious, glabrous, scapes erect, rather 

 stout, i>^ -3 tall. Leaves broad, sagittate, 

 4 / -i2 / 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 // -i5 // long, longer than the 

 fertile pedicels ; petals 8 // -i4 // long ; fila- 

 ments glabrous ; styles curved, twice as long 

 as the ovaries ; achene obovate, about 2"" 

 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. 



In swamps and along ponds. New Jersey ancT 

 Pennsylvania to Alabama. July-Sept. 



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. 

 Sagittaria Engelmanniana J. G. Smith, Mem. Torr. Club, 5: 



25. 1894. 



Monoecious, glabrous, scape erect or ascending, slen- 

 der, 8'-2(/ high. Leaves narrow, i^4 / -8 / long, i' / -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 // -i2 // 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 %" long. 



In shallow water, Massachusetts to Delaware, near the 

 coast, probably extending further south. Aug.-Sept. 



Sagittaria latifolia Willd. Broad-leaved Arrow-head. (Fig. 195.) 



Sagitlaria latifolia Willd. Sp. PI. 4 : 409. 1806. 

 Sagiliaria 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 > as- 

 long as the blade ; bracts acute, acuminate or obtuse, the 

 upper ones sometimes united ; flowers I'-i^' wide ;. 

 filaments slender, glabrous; achene i // -2 // long, broadly 

 winged on both margins, its sides even or i-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 pubescens (Muhl.) J. G. Smith, Mem. Torr. 



Club, 5 : 26. 1894. 

 Sagitlaria pubescens Muhl. Cat. 86. 1813. 



Whole plant pubescent, varying from merely puberulent to- 

 densely hirsute. Ontario to New Jersey, Florida and Alabama. 



