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Alisma Linn., Sp. Pl. 342. 1753. Gen. Pl. ed. 5. 160. 1754; Hook. f., Fl. Brit. Ind. 6: 559. 1893 pro parte.
Perennial hydrophytes or marsh herbs with acrid juice. Leaves upright, linear-lanceolate to ovate. Inflorescence a pyramidal panicle with verticillate branches and flowers. Flowers bisexual, white or pink, bracteate. Thalamus flat, rarely convex. Sepals 3, persistent, appressed in fruit. Petals 3, larger than sepals. Stamens twice as many as petals, in a single whorl and antipetalous pairs, filaments coherent at the base to form nectary, anthers semi-versatile. Carpels many, arranged in a verticil; ovaries unilocular with single basal anatropous ovule; style ventral, erect or curved, stigma papillate. Achenes laterally much compressed, ventrally somewhat beaked near apex, ridged outside. Seeds erect.
About 10 species; chiefly distributed in north temperate regions, E. Africa and Australia.
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| 1 |
Anthers elliptic-oblong. Style erect, loner than the ovaries |
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(2) |
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Anthers suborbicular or isodiametric. Style recurved, shorter than the ovaries |
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Alisma gramineum |
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| 2 (1) |
Leaves broadly linear-lanceolate, gradually narrowed at the base into petiole. Petals acute |
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Alisma lanceolatum |
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Leaves broadly lanceolate-ovate, rounded or slightly cordate at the base. Petals obtuse |
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Alisma plantago-aquatica* |
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Lower Taxa
Related Synonym(s):
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