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FOC | Family List | FOC Vol. 23 | Hydrocharitaceae

10. Halophila Thouars, Gen. Nov. Madagasc. 2. 1806.

喜盐草属 xi yan cao shu

Herbs, submerged marine. Stems slender, easily breaking, creeping, branched, rooting at nodes, with 2 scales at each node. Leaves usually opposite or binate, usually petiolate, margin entire or serrulate. Plants dioecious or monoecious; flowers unisexual. Spathes 2-valved, sessile, usually 1-flowered. Male flowers pedicellate; perianth segments 3; stamens 3, alternate with perianth segments, filament absent; anthers 2-4-thecous, extrorse; pollen moniliform. Female flowers sessile or subsessile; ovary with an apical beak; beak expanded at apex into 3 minute perianth lobes; ovules 2 to numerous; styles (2 or)3-5, threadlike. Fruit with beak at apex; pericarp membranous. Seeds few to many, globose or subglobose.

About nine species: along the coasts of the W Indian and S Pacific Oceans; four species in China.

1 Lateral shoots 1-1.5 cm, each with 6-10 leaves; leaves narrowly elliptic to lanceolate, without cross veins.   4 H. beccarii
+ Lateral shoots shorter than 1 cm, each with only 1 pair of leaves; leaves ovate to elliptic, with 3-25 pairs of cross veins   (2)
2 (1) Leaves 0.5-1.2 cm, cross veins in 3-8 pairs and diverging from midvein at an angle of 70-90º.   3 H. minor
+ Leaves 1-4 cm, cross veins in 6-25 pairs and diverging from midvein at an angle of 45-60º   (3)
3 (2) Leaves 1-4 cm, entire and smooth, cross veins in 12-25 pairs.   1 H. ovalis
+ Leaves 1-2.2 cm, margin finely serrulate, pubescent on both surfaces, cross veins in 6-9 pairs.   2 H. decipiens

Lower Taxa


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