ALISMACEAE. 25 



3. SAGITTARIA L. Arrow-Head. 



Fertile pedicels slender, aseeuding, not reflexed in fruit. 

 Leaf -blades sagittate; filaments glabrous. 

 Beak of the achene erect. 



Fruiting pedicels shorter than the bracts; leaves broad. 



1. S. longkostra. 

 Fruiting pedicels longer than the bracts; leaves narrow. 



2. S. Engelmanniana. 

 Beak of the achene horizontal or oblique. 3. S. latifoUa. 



Leaf -blades entire, or rarely hastate or cordate. 



Fruiting heads sessile or very nearly so. 4. S. rigida. 

 Both staminate and pistillate flowers pedicelled. 



5. S. graminea. 

 Fertile pedicels stout, reflexed in fruit ; filaments dilated. 



6. S. subulata. 



1. Sagittakia longirostra (Micheli) J. G. Smith. M. p. 57. In swamps 



and along ponds. Summer. 

 Delatcare — (P.) . Lancaster — (P.) . 



2. Sagittaria Engelmanniana J. G. Smith. M. p. 57. Shallow water. 



Summer. 



PJuladelp]iia—4:6t'h and Spruce streets (Mac). BucJis—{P.). North- 

 ampton — (P.). 



Biirlington— (Quaker Bridge, Brown Mills (C), east of Medford (St.). 

 Gloucester— Westville (Li.). ^tZan tic— Pleasant Mills (C). Ocean- 

 Toms River (Fu.). Monmouth— Sandy Hook (C). 



3. Sagittaria latifolia Willd. M. p. 57. In water and wet places. Sum- 



mer. 

 3a. Sagittaria latifolia pubescens Muhl. M. p. 57. Shallow water. 

 Summer. 

 £i{cA"s— Sellersville (Fr.). C/iester- Mortonville (St.). Northampton 

 — Seidersville (P.). 



4. Sagittaria rigida Pursh. M. p. 58. Swamps or shallow water. Summer. 



Philadelphia — Bartram's Garden (Mac). Buds — Sellersville (Fr.). 

 Delaware — Tinicum (Fr.). Lancaster — (P.). Northampton — (P.). 

 Dauphin — Harrisburg (P.). 



Camden — Camden, Mart. (B. C), Gloucester (Te.). Gloucester — West- 

 ville (He.) (Li.) (Wn.). Hunterdon— Bull Island (C). 

 New Castle—Scarce. 



5. Sagittaria graminea Michx. M, p. 59. Mud or shallow water. Sum- 



mer. 

 BmcA-s— Bristol (Mac.) (Te.). Delaware— Marcus Hook (Fu.). Series 

 — (P.). Northampton — (P.). 



Camden— Camden, Mart. (B. C). Cape Ma?/- Cape May (Te.). 

 Neio Castle— Delavf are City. 



6. Sagittaria subulata (L.) Buchenau. M. p. 59. Tidewater mud. Sum- 



mer. 



Philadelphia— Horresdale (Br.). Delaware- Tinicum, Dr. Geo. Smith 

 (P.). 



Caiw^e« — Shores of the Delaware (C), Fish House (Br.), Washington 

 Park (VP.). Ifercer— Trenton (C). 



