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FOC | Family List | FOC Vol. 23 | Alismataceae

1. Sagittaria Linnaeus, Sp. Pl. 2: 993. 1753.

慈姑属 ci gu shu

Lophiocarpus (Kunth) Miquel (1870), not Turczaninow (1843); Lophotocarpus T. Durand; Sagittaria sect. Lophiocarpus Kunth.

Herbs, aquatic, often stoloniferous and tuberiferous. Leaves aerial, floating, or submerged, linear, lanceolate, deeply cordate, or sagittate. Inflorescences usually of 3-flowered whorls each with 3 bracts. Flowers unisexual or polygamous, upper ones male, with longer and slender pedicels, lower ones female or bisexual, with shorter and thickened pedicel. Stamens (6-)9 to numerous. Carpels numerous, spirally arranged, each with 1 ovule; styles apical or subadaxial. Achenes laterally compressed, margins usually winged, with an apical or lateral stylar beak.

About 30 species: tropical and temperate regions; seven species (two endemic) in China.

1 Persistent sepals not reflexed after anthesis   (2)
+ Persistent sepals reflexed after anthesis   (4)
2 (1) Leaves floating or submerged, floating leaves broadly ovate to cordate-ovate; flowers polygamous; achenes with cristate wing.   1 S. guayanensis
+ Leaves aerial or submerged, sagittate or lanceolate; flowers unisexual; achenes without cristate wing   (3)
3 (2) Aerial leaves linear-lanceolate; female flowers without or only with very short pedicel.   6 S. tengtsungensis
+ Aerial leaves sagittate; female flowers pedicellate.   4 S. lichuanensis
4 (1) Leaves sessile or only with very short petiole, linear or subspatulate; achenes cristate on back.   7 S. pygmaea
+ Leaves petiolate; achenes not cristate on back   (5)
5 (4) Leaves floating or submerged.   2 S. natans
+ Leaves aerial or submerged   (6)
6 (5) Achenes with an adaxial beak; aerial leaves elliptic to ovate or sagittate, submerged leaves lanceolate; stolons usually lacking.   5 S. potamogetonifolia
+ Achenes with an apical beak; leaves sagittate.   3 S. trifolia

Lower Taxa


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