APPENDIX. 



Sagittaria ^ smaller, western species with similar 



ambigua leaves and flowers, but the filaments 



July-Septem- smooth. The achene with a short oblique 



beak, and very narrow wings. 1-2 feet 

 high. Margins of ponds. Kan. and south. 

 Sagittaria Very variable as to its leaves which are 



heteropkyila linear, lance-shaped, and elliptical, as well 

 July-Septem= as lance-ovate with two narrow, short 



basal lobes one of which is sometimes abor- 

 tive. The flower-stalk, shorter than the leaves, is limp 

 and finally prostrate. Flowers of the second order, the 

 pistillate ones of the lowest circle almost stemless. 

 Achenes narrowly oval with a long erect beak. 8-30 

 inches high. Swamps and margins of ponds. Me., 

 south, and west to Minn, and Neb. 



Leaves lance-shaped to linear on long 

 Sagittaria , , ~ ~ . , , 



graminea slender stems, 3-5 veined, and some re- 



White or duced to mere flattened phyllodia (leafless 



pinkish stems) ; all acute-pointed. Flowers stami- 



July-Septem- nate or the i ower c i rc i e pistillate, the 

 petals often a very pale magenta pink, 

 the filaments dilated and slightly fine-hairy. Achenes 

 extremely small and almost beakless, slightly winged, 

 and ribbed on the sides. 4-32 inches high, Me., south, 

 and west to Neb. and Tex. Britton & Brown record 

 the early leaves as often purplish that is, magenta- 

 tinged. 



Sagittaria tares -^ species almost without leaves but 

 * August- with cylindrical, pointed phyllodia rarely 



September bearing a linear blade. Flowers of the 

 second order, in 1-3 circles only, and small scarcely 

 ove r J inch broad, with 12 dilated fine-hairy filaments. 

 Achene obovate, with a short erect beak, the sides scol- 

 lop-ridged. 4-16 inches high. Ponds, Cape Cod, Mass., 

 Long Island, N. Y., south. 



Sagittaria -^ dwarf species with linear or linear- 



subulata lanceolate leaves, obtuse or acute, or 



July-Septem- reduced to strap-shaped phyllodia. Flow- 

 ers generally of the second order, and 

 sometimes of the third order, small, and with 6-8 smooth 

 filaments. Achene scollop-ribbed and short-beaked. 



540 



