The Genus Sagittaria

 

Flowering Stalk Multiply Branched
Water Plantain Alisma triviale
Leaves Thin, not Broad or Arrow-shaped
Grass-leaved Arrowhead Sagittaria graminea	Slender Arrowhead Sagittaria teres	Engelmann's Arrowhead Sagittaria engelmanniana
Leaves Broad or Arrow-Shaped
Broad-leaved Arrowhead Sagittaria latifolia	Sessile-fruited Arrowhead Sagittaria rigida	Engelmann's Arrowhead Sagittaria engelmanniana