Sagittaria filiformis J.G. Smith. clade: Graminea Group, Platyphylla Complex. Common name: Threadleaf Arrowhead. Phenology: May-Sep. Habitat: Swiftly flowing water of blackwater rivers and streams, blackwater lake shores, tidal waters. Distribution: As conceived here, probably ranging from ME south to s. FL, s. AL, and s. MS.
ID notes: The forms growing in swiftly flowing black water are remarkable and unlikely to be recognized as a Sagittaria unless in flower, with linear leaves over 100 cm long and only 1-3 mm wide, with 5-7 parallel ribbed veins, resembling S. kurziana.
Origin/Endemic status: Native
Taxonomy Comments: The proper taxonomic treatment and associated nomenclature to apply to these plants has been uncertain and controversial (see synonymy).
Synonymy ⓘ: = AqW, FNA22, NE, NS, NY, Pa, POWO, Va, WH3, Keener (2005); = n/a — Tat; = Sagittaria stagnorum Small — GW1; = Sagittaria subulata (L.) Buchenau var. gracillima (S.Watson) J.G.Sm. — F, G, RAB, Bogin (1955); > Sagittaria filiformis J.G.Sm. — S; >< Sagittaria kurziana Glück — SFla; > Sagittaria lorata Chapm. — S, S13; > Sagittaria stagnorum Small — S, SFla; < Sagittaria subulata (L.) Buchenau — C; Sagittaria filiformis J.G.Sm. Basionym: Sagittaria filiformis J.G.Sm. 1894
Links to other floras: = Sagittaria filiformis - FNA22
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Wetland Indicator Status:
- Atlantic and Gulf Coastal Plain: OBL
- Eastern Mountains and Piedmont: OBL
- Northcentral & Northeast: OBL
Heliophily ⓘ: 8
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© Siddarth Machado, some rights reserved (CC BY), uploaded by Siddarth Machado source CC-BY | Original Image ⭷
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