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11. Potamogetonaceae

眼子菜科 yan zi cai ke

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

Herbs, perennial or annual, in fresh to brackish water, totally submerged or with floating leaves. Rhizomes present or absent. Stems elongated or shortened, terete to compressed, rarely strongly compressed. Leaves alternate or basal, occasionally opposite or subopposite; stipules free from leaves or adnate to leaf base and sheathing stems. Inflorescence a capitate spike, terminal or axillary. Plants monoecious; flowers small, bisexual. Perianth bractlike, free, present or absent. Stamens (1-)4; anthers sessile, (1 or)2-celled, extrorse, longitudinally dehiscent. Carpels (1-)4, free; ovule solitary. Fruit drupaceous. Embryo curved; endosperm absent.

Three genera and ca. 85 species: cosmopolitan; two genera and 24 species in China.

Guo Youhao & Li Qingyi. 1992. Potamogetonaceae (excluding Halodule, Phyllospadix, Posidonia, Ruppia, Syringodium, Triglochin, and Zostera). In: Sun Xiangzhong, ed., Fl. Reipubl. Popularis Sin. 8: 40-83.

1 Submersed leaves with stipules free from leaf base, or if adnate then adnate portion less than 1/2 length of stipule; leaves submersed and floating or all submersed; submersed leaf blades translucent, not channeled, flattened; peduncle stiff, submersed or projecting above water surface.   1 Potamogeton
+ Submersed leaves with stipules adnate to leaf blade for 2/3 or more length of stipule; leaves all submersed, blades opaque, channeled; peduncle lax, not projecting inflorescence above water surface.   2 Stuckenia

Lower Taxa


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