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