PLANTS OF ONONDAGA COUNTY 29 



P. PERFOLIATUS — Lin., 1753. Clasping-leaved Pondweed. 

 Leaves ovate, submerged and clasping. Frequent. 

 Ponds and slow streams. Oneida Lake, Aug., 1895. 



P. CRISPUS — Lin., 1753. Curled-leaved Pondweed. 



Fruit triple keeled. Lateral keel with projecting tooth. 

 Frequent. Tully Lakes, 1895. 



P. zosTERAEFOLius — Schum, 1801. Eel-grass Pond-weed. 

 Leaves linear. Three large and numerous small nerves. 

 Common. Ponds and slow streams. Three River Point, 

 July, 1896. 



P. HiLLii— Morong, 1881. Hill's Pondweed. 



Leaves narrow, blunt, three-nerved. Occasional. Ponds 

 etc. White Lake, summer, 1899. 



P. OBTUSiFOLius — Mert and Koch, 1823. Blunt-leaved 

 Pondweed. 



Leaves mucronate and variously nerved. Frequent. 

 Stagnant waters. Mud Lock, September, 1896. 



P. FOLiosus — Raf, 1808. (P. Pauciflorus — Pursh, 18 lU.) 

 Leafy Pondweed. 

 Stem branched. Leaves linear, short. Low, stagnant 

 water north from Salina. Aug., 1900. 



P. PUSILLUS — Lin., 1753. Small Pondweed. 



Leaves submerged, linear, with two glands at base. 

 Frequent. Low, stagnant waters north from Salina. 

 Aug., 1900. 



P. DiVERSiFOLius — Raf, 1808. Rafinesque's Pondweed. 

 Stagnant water near Apulia. Aug., 1889. 



P. MUCRONATES — Schrad. Mucronate Pondweed. 



Resembles P. pusillus. Stem less branching and flat 

 and 5- to 7-nerved leaves ; broader. Not mentioned by 

 Britton. Spec, in S. B. C. Herb. 



P. PECTINATUS — Lin., 1753. Fennel-leaved Pondweed. 

 Stem and leaves filiform, dichotomously branching. 

 Common. Salt Marsh. 



P. MARINUS — Lin,, 1753. Marine Pondweed. 



Leaves small, linear, crowded. In sluggish water near 

 Long Branch. Aug., 1896. 



