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Limnophyton obtusifolium (Linn.) Miq., Fl. Ind. Bat. 3: 243. 1856. Hook. f., l.c. 560; Hartog in Steenis, Fl. Males. ser. 1, 5: 324. fig. 4. 1957; Cooke, Fl. Bomb. Pres. (reprint. ed.) 3: 344. 1958; Susan Carter in Hubbard & Milne-Redhead, Fl. Trop. E. Mr. (Alism.) 9. fig. 5, l-3. 1960; Subramanyam, Aquatic Angio. 86. fig. 52. 1962; F.N. Hepper in Hutch. & Dalz., Fl. W. Trop. Afr. 3: 11. 1968.
Alisma obtusifolium (Linn.)Alisma sagittifolium Willd.Sagittaria obtusifolia Linn.
Annual, erect, 60-90 cm tall herb. Leaves broadly ovate, sagittate, with spreading, acute triangular lobes, 15-30 cm long, pellucid-punctate, obtuse or emarginate at the apex; petiole 30-80 cm long, triangular, spongy. Peduncle as long as the petioles, triangular. Flowers 5-10 in each whorl, c. 1 cm across; pedicels 2.5-5 cm long, reflexed and thickened in fruit; bracts triangular-lanceolate, 1.5-2.5 cm long, c. 1 cm broad, bracteoles minute. Sepals ovate-elliptic, 4-6 mm long, 2-3.5 mm broad, obtuse, green. Petals delicate, obovate-elliptic, larger than the sepals. Stamens with c. 3 mm long, basally flattened and thickened filaments; anthers oblong. Achenes obovate, minutely stipitate, 4-6 (-8) mm long, 3-4 mm broad, reticulately ribbed, shortly beaked.
Fl. Per.: July-September.
Lectotype: Asia, Plukenet t. 220. f. 7 in Herb. Sloan Vol. 97. fol. 181 (BM).
Distribution: Far east Asia to Madagascar and topical Africa through Indo-Pakistan subcontinent and Sri Lanka (Ceylon).
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