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Alisma lanceolatum With., Arrang. Brit. Pl. ed. 3. 2: 362. 1796. Yuzepchuk in Komarov, Fl. URSS 1: 281. 1934; Clapham et al, Fl. Brit. Is. ed. 2. 934. 1962; Dandy in Rech. f., Fl. Iran. 78: 4. t. 3. 1971.
Alisma plantago-aquatica var. lanceolatum (With.) Koch.Alisma stenophyllum Samuelsson
An erect, glabrous, emergent herb. Leaves broadly linear-lanceolate, 6-7.5 cm long, 1-1.4 cm broad, somewhat glaucous, cuneately tapering into as long as or much longer petiole, acute. Panicle of (3-) 4-6 ascending branches and pedicels per verticil, 30-40 cm long. Flowers purplish-pink, c. l.2 cm across; pedicels slender, 1.5-l.8 (-2.2) cm long; bracts triangular-ovate, 5-10 mm long, acuminate. Sepals triangular-ovate, c. 3 mm long, c. 2 mm broad, with membranous margins, acute. Petals membranous, oblong, 5-6 mm long, 2-2.5 mm broad, acute. Stamens with c. 2 mm long filaments; anthers elliptic-oblong. Ovaries c. 1 mm long, glabrous; styles longer than the ovaries, erect. Achenes obovate, c. 2-2.5 mm long, pale brown, with 1 or 2 furrows on back. Seeds oblong, c. 1.5 mm long, reddish brown.
Fl. Per.: June-September.
Type: Described from England.
Distribution: West Pakistan, Central and South-western Asia, north west Africa and Europe.
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