Potamogeton pusillus small pondweed Potamogetonaceae POPU; Q, wl; R, wp; 

Potamogeton pusillus.commons.wikimedia.org

Potamogeton pusillus.with flowers.commons.wikimedia.org (Accessed 11/2014).

Potamogeton pusillus is a perennial, submerged monocotyledon, rooted aquatic, stems filamentous, to 1.5 m long, branching near ends. 

Leaves alternate, all submerged, linear 1-7 cm long, to 0.2 cm wide with 1-3 veins, 2 small, translucent glands at base, sheath at base of leaf to 1 cm long, membranous, free above; winter buds 1-3 cm, leaves rolled into a hard spindle-shaped body in axils along branches. 

Flowers tiny, in round to cylindrical spikes 0.2-1 cm long, at ends of stalks 0.5-6 cm long. 

Fruit an oval achene 0.2 cm long, minutely beaked (use lens); blooming and fruiting July-Sept (Hough 1983). 

Wetland status: OBL. 

Frequency in NYC: Very infrequent. 

Origin: Native. 

Habitat: Acid to alkaline water.