Sagittaria subulata

Sagittaria subulata, the awl-leaf arrowhead, narrow-leaved arrowhead or dwarf sagittaria, is an aquatic plant species.

Description
It is a perennial herb up to 40 cm tall. The leaves are submersed or floating, narrowly linear to ovate, not lobed. The inflorescence floats on the surface of the water.

Distribution and habitat
It is native to the Colombia, Venezuela, and every US state along the coast from Massachusetts to Louisiana. It has also been reported as naturalized in Great Britain on just three occasions; only one of these is recent and it appears to have become extinct by 2010. It is also recorded as a non-native on the Azores, and on the Island of Java in Indonesia. It grows primarily in shallow brackish water along the seacoast, in marshes, estuaries, etc.

Conservation
It is listed as special concern in Connecticut, as endangered in Massachusetts, as rare in Pennsylvania, and as historical in Rhode Island.