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15. Cymodoceaceae

丝粉藻科 si fen zao ke

Authors: Youhao Guo, Robert R. Haynes & C. Barre Hellquist

Plants submerged in salt water. Rhizomes creeping, usually slender. Stems shortened. Leaves sessile, alternate, subopposite, or crowded at nodes, linear, with conspicuous midvein, sheathing at base. Plants dioecious. Flowers minute, unisexual, solitary or in cymes. Male flowers pedunculate; perianth of 3 small scales or absent; stamens 1-3; anthers connate, sessile, longitudinally dehiscent; pollen grains threadlike. Female flowers sessile; perianth absent or cupular or of 3 segments; carpels 2, free; style simple or divided into 2(-4) filiform stigmas; ovule 1, pendulous. Fruitlet achene- or nutlike. Seeds without endosperm.

Four genera and 16-20 species: tropical and subtropical regions worldwide; three genera and four species in China.

Guo Youhao & Li Qingyi. 1992. Halodule and Syringodium. In: Sun Xiangzhong, ed., Fl. Reipubl. Popularis Sin. 8: 96-102; Zhou Lingyun, You Jun & Zhong Xiongwen. 1992. Cymodocea. In: Sun Xiangzhong, ed., Fl. Reipubl. Popularis Sin. 8: 107.

1 Flowers in cymes; leaves subulate-terete.   3 Syringodium
+ Flowers solitary; leaves linear, flattened   (2)
2 (1) Styles simple; anthers attached at different levels; leaves 1-4, alternate, 3-veined.   2 Halodule
+ Styles divided into 2 filiform stigmas; anthers attached at same height on stalk; leaves 2-7 together on short erect shoots, 7-17-veined.   1 Cymodocea

Lower Taxa


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