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FOC | Family List | FOC Vol. 23 | Hydrocharitaceae

7. Vallisneria Linnaeus, Sp. Pl. 2: 1015. 1753.

苦草属 ku cao shu

Physkium Loureiro.

Herbs, submerged, stoloniferous, without erect stems. Leaves basal, sessile, linear or strap-shaped, veins 3-9, parallel, slightly sheathed at base, margin minutely serrulate or entire. Plants dioecious; flowers unisexual. Male flowers numerous, minute, shortly pedicellate, clustered together on a central column enclosed by a common spathe, each flower finally breaking free and floating on water surface; spathe ovate or broadly lanceolate, shortly pedunculate; sepals 3, convex, 2 larger than other; petals 2 or 3, minute; stamens 1-3. Female flowers solitary in spathe; spathe tubular, bifid at apex, pedunculate; peduncles long, coiled after anthesis; sepals 3; petals 3, minute; ovary narrowly cylindric or narrowly triangular-cylindric; ovules numerous; styles 3, bifid. Fruit cylindric or triangular-cylindric. Seeds numerous, oblong or fusiform.

About eight species: tropical and subtropical regions; three species (one endemic) in China.

1 Stamen 1; fruit cylindric; veins without spines.   1 V. natans
+ Stamens 2; fruit triangular-cylindric; midveins with minute spines   (2)
2 (1) Seeds 2-5-winged.   2 V. spinulosa
+ Seeds without wings.   3 V. denseserrulata

Lower Taxa


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