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Sagittaria filiformis, the threadleaf arrowhead,[2] is an aquatic plant species native to the eastern United States, from Maine south to Florida and Alabama. it occurs in flowing streams in the northern part of its range, but more stagnant waters such as marshes and swamps in the South.[3][4]

Threadleaf arrowhead
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Monocots
Order:	Alismatales
Family:	Alismataceae
Genus:	Sagittaria
Species:	S. filiformis
Binomial name
Sagittaria filiformis J.G.Sm.
Synonyms[1]
Sagittaria natans Michx. Sagittaria natans var. gracillima S.Watson Sagittaria stagnorum Small Sagittaria storiflexum B.Bagmor. Sagittaria subulata var. gracillima (S.Watson) J.G.Sm. Sagittaria subulata var. natans J.G.Sm.

Sagittaria filiformis is a perennial herb up to 170 cm tall. Some leaves are thread-like, entirely underwater, but others are narrowly ovate or lanceolate and floating on the surface.[3][5]

References

External links

• photo of herbarium specimen at Missouri Botanical Garden, holotype of Sagittaria filiformis, collected in Alabama
• photo of herbarium specimen at Missouri Botanical Garden, Sagittaria filiformis, collected in Florida
• Center for Aquatic and Invasive Plants, University of Florida
• Go Botany, New England Wildflower Society
• Maine Department of Agriculture Conservation and Forestry, Maine Natural Areas Program,

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