Alismataceae
Threadleaf arrowhead
Sagittaria filiformis
- Family
- Alismataceae
- Genus
- Sagittaria
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Common names
By language (2)
- Arabic
- سهم الماء خيطي الشكل
- English
- Threadleaf arrowhead
Synonyms
- Sagittaria natans Michx.
- Sagittaria natans var. gracillima S.Watson
- Sagittaria stagnorum Small
- Sagittaria subulata var. gracillima (S.Watson) J.G.Sm.
- Sagittaria subulata var. natans (Michx.) J.G.Sm.
Flowers
- In flower
- March to May, August, November (from 12 flowering iNaturalist observations worldwide)
Characteristics
- Growth habit
- Forb/herb
- Lifespan
- Perennial
- In the US and Canada
- Lower 48 states: native
Photos
FlowerPhoto: mfeaver, CC BY 4.0, from iNaturalist 
FlowerPhoto: Siddarth Machado, CC BY 4.0, from iNaturalist 
FlowerPhoto: Ian Talty, CC BY 4.0, from iNaturalist 
FlowerPhoto: Ann Redmond, CC BY 4.0, from iNaturalist 
Photo: Patrick Belk, CC BY 4.0, from iNaturalist 
Photo: tas56, CC BY-SA 4.0, from Wikimedia Commons 
Photo: Patrick Belk, CC BY 4.0, from iNaturalist 
Photo: naturedom12, CC0, from iNaturalist 
Photo: Athena Philips, CC BY 4.0, from iNaturalist 
Photo: Brandon Corder, CC BY 4.0, from iNaturalist
More in Sagittaria
- ArrowheadSagittaria sagittifoliaAlismataceae
- Broadleaf arrowheadSagittaria latifoliaAlismataceae
- Threeleaf arrowheadSagittaria trifoliaAlismataceae
- Sagittaria natansAlismataceae
- Giant arrowheadSagittaria montevidensisAlismataceae
- Awl-leaf arrowheadSagittaria subulataAlismataceae
- Sagittaria pygmaeaAlismataceae
- Delta arrowheadSagittaria platyphyllaAlismataceae
- Sessile-fruited arrowheadSagittaria rigidaAlismataceae
- Sagittaria aginashiAlismataceae
- Grassy arrowheadSagittaria gramineaAlismataceae
- Longbarb arrowheadSagittaria longilobaAlismataceae
Sources: classification, synonyms from World Flora Online Plant List (2026-06, CC0 1.0); common names, popularity from Wikidata (2026-10-26, CC0 1.0); common names, US characteristics from USDA PLANTS Database (2025-05-29, CC0 1.0). About our plant data.