The plant is conspicuous for its large, lance-shaped leaves which grow up from  underground rhizomes and its showy, white three-petaled flowers which form at the end of long, thick stalks.
 Each flower has three green sepals, three white or pink-tinged petals, at least six stamens, and  pistils which may be in separate flowers.
  The plant likes to grow in fresh or brackish water and is commonly found in ditches, marshes, swamps and along the shores of lakes and streams.

Sagittaria lancifolia reproduces both asexually through spreading  rhizomes and sexually through  reproduction of copious achenes, a dry fruit each of which carries a single seed.
The achenes are  dispersed through  animal vectors and  through hydrochory (dispersal through wind, water, or gravity).
The achenes germinate only under light, and with or without available fluid,  but the period of their germination is shorter when they are submersed in water.
Temperature is a factor, with 100% germination occurring at 20 °C (68 °F).
Germination is reduced in anaerobic conditions.
Growth is also dependent on temperature.
The plant is conspicuous for its large, lance-shaped leaves which grow up from  underground rhizomes and its showy, white three-petaled flowers which form at the end of long, thick stalks.  Each flower has three green sepals, three white or pink-tinged petals, at least six stamens, and  pistils which may be in separate flowers.   The plant likes to grow in fresh or brackish water and is commonly found in ditches, marshes, swamps and along the shores of lakes and streams.
Sagittaria lancifolia reproduces both asexually through spreading  rhizomes and sexually through  reproduction of copious achenes, a dry fruit each of which carries a single seed. The achenes are  dispersed through  animal vectors and  through hydrochory (dispersal through wind, water, or gravity). The achenes germinate only under light, and with or without available fluid,  but the period of their germination is shorter when they are submersed in water. Temperature is a factor, with 100% germination occurring at 20 °C (68 °F). Germination is reduced in anaerobic conditions. Growth is also dependent on temperature.
Sagittaria lancifolia