CATALOGUE OF PLANTS. 255 
SPHIRODELA, Schleid. 
Duck-weed. 
‘S$. polyrhiza (L.), Schleid. (Lemna polyrhiza, L.) 
Ponds. Common throughout the State. 
WOLFFIA, Horkel. 
: Wolffa. 
W. Columbiana, Karsten. 
Bergen : Closter, rare—Austin. Camden: Kaighn’s Point— 
Martindale. 
ALISMACEZE. 
ALISMA, L. 
Water Plantain. 
A. Plantago, L. (Including var. Americanum, Gray.) 
In shallow water. Common throughout the State. 
SAGITTARIA, L. 
Arrow Head. 
$. sagitteefolia, L., forma obtusa (Willd.), Britt. 
-Camden: In the Delaware River—Martindale, C. E. Smith. 
Forma latifolia (Willd.), Britt. 
Camden: In the Delaware River—Martindale. 
Forma hastata (Pursh), Britt. 
In wet places. Common throughout the State. 
Forma angustifolia (Engelm.), Britt. 
Burlington: Quaker Bridge—Leggett. Camden :—Martin- 
dale. 
Forma gracilis (Pursh), Britt. 
In pine-barren swamps; frequent. Burlington: Quaker 
Bridge—Leggett; Brown’s Mills—E. Diffenbaugh. Atlantic: 
Pleasant Mills—Leggett; along Mullica River—C. E. Smith. 
Monmouth: Sandy Hook—Martindale. 
S. calycina, Engelm. 
Bergen: Hackensack marshes and Fairview—Austin. 
