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FOC | Family List | FOC Vol. 23 | Hydrocharitaceae

2. Ottelia Persoon, Syn. Pl. 1: 400. 1805.

海菜花属 hai cai hua shu

Boottia Wallich; Oligolobos Gagnepain.

Herbs, freshwater. Stems usually cormlike. Leaves all basal, petiolate, usually sheathing at base; blades submerged or sometimes floating, linear to broadly ovate, 3-11-veined. Spathes elliptic or ovate, usually 2-6-winged, apex bifid or trifid, with 1 to many flowers. Flowers bisexual or unisexual and plants dioecious. Male flowers with longer pedicel. Bisexual and female flowers shortly pedicellate or without pedicel. Sepals 3, greenish, linear, oblong, or ovate. Petals 3, colored, orbicular to broadly obovate, much longer and wider than sepals. Stamens 3-15; filaments linear, flattened; anthers laterally dehiscent; staminodes (absent or 1-)3, often present in female flowers. Ovary of 3, 6, or 9 (or more) carpels; ovules numerous; stigmas 2 per style, linear. Fruit cylindric, fusiform, or conic. Seeds numerous, small, often hairy.

About 21 species: tropical to temperate areas; five species (two endemic) in China.

1 Flowers bisexual   (2)
+ Flowers unisexual   (3)
2 (1) Spathe with only 1 flower; flowers without gland; leaf sheath absent.   1 O. alismoides
+ Spathe with many flowers; flowers with gland; leaves sheathed at base.   2 O. balansae
3 (1) Female spathe with 2-9 female flowers; styles 3; fruit triangular-cylindric to fusiform.   5 O. acuminata
+ Female spathe with only 1 female flower; styles more than 3; fruit oblong   (4)
4 (3) Leaves dimorphic, submerged and floating; seeds smooth; male spathe with 10-30 male flowers.   3 O. cordata
+ Leaves not dimorphic, emersed; seeds densely hairy; male spathe with 47-60 male flowers.   4 O. emersa

Lower Taxa


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