100 



ALISMACEAE. 



VOL. I. 



4. Sagittaria brevirostra Mack. & Bush. 

 Short-beaked Arrow-leaf. Fig. 234. 



Sagittaria variabilis dii'ersifolia Engelm. in A. Gray, 



Man. Ed. 5, 493. 1867. 

 Sagittaria brevirosta Mack. & Bush, Rep. Mo. Bot. 



Card. 16 : 102. 1905. 



Monoecious, glabrous, scape erect, i-2 tall, 

 simple or branched. Leaves ovate to lanceolate, 

 sagittate or hastate, s'-i7' long, acute at the apex, 

 the basal lobes lanceolate to linear-lanceolate, 

 about i the length of the blade ; scape usually 

 taller than the leaves, 4-6-angled; bracts lanceo- 

 late to linear-lanceolate, attenuate ; flowers i' 

 broad or less; filaments glabrous, slender; achene 

 suborbicular to cuneate-obovate, i*"-\' long, 

 broadly winged on both margins, and ridged on 

 the sides, the short erect beak less than 4 as long 

 as the body. 



In bogs and shallow streams, New Jersey and 

 Pennsylvania to Florida and Tennessee. Aug.-Oct. 



5. Sagittaria latifolia Willd. Broad-leaved Arrow- 

 head. Fig. 235. 



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



Sagittaria -cariabilis 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 I to i as 

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

 upper ones sometimes united; flowers i'-ij' 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. 



6. Sagittaria pubescens Muhl. Hairy 

 Arrow-leaf. Fig. 236. 



Sagittaria pubescens Muhl. Cat. 86. 1813. 

 Sagittaria sagittifolia pubescens Torr. Comp. 356. 



1826. 

 Sagittaria variabilis pubescens Engelm. in A. Gray, 



Man. Ed. 5, 493. 1867. 

 Sagittaria latifolia pubescens J. G. Smith, Mem. 



Torrey Glub 5: 25. 1894. 



Monoecious or rarely dioecious, pubescent, scape 

 erect, i-2 tall, simple or rarely branched. Leaves 

 ovate, deltoid' or deltoid-lanceolate, mostly acute, 

 rarely acuminate at the apex ; basal lobes \ the 

 length of the blades or nearly so ; bracts obtuse, 

 sometimes broadly rounded; flowers i'-i' wide; 

 filaments very slender, glabrous; achene iJ"-2" 

 long, winged on both margins, its sides promi- 

 nently winged, the beak about \ its length. 



In bogs and shallow water. Nova Scotia to Wis- 

 consin, Missouri and Kansas. July-Sept. 



