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4. Alisma Linnaeus, Sp. Pl. 1: 342. 1753.
泽泻属 ze xie shu
Herbs, aquatic or of marshes, usually with a tuber. Leaves aerial, floating, or submerged, all basal, petiolate, margin entire. Inflorescences paniculate or occasionally umbellate; branches whorled, each one usually secondarily branched and with bracts at base. Flowers bisexual. Petals usually larger than sepals. Stamens 6. Carpels numerous in a single whorl, free, each with 1 ovule. Achene laterally compressed, 1- or 2-grooved or canaliculate abaxially, with a usually adaxial beak.
About 11 species: temperate and subtropical regions; six species (one endemic) in China.
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| 1 |
Anthers broader than long; style 0.1-0.2 mm; plants slender. |
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6 A. nanum |
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Anthers narrower than long; style longer than 0.4 mm; plants ± robust |
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(2) |
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| 2 (1) |
Aerial leaves usually elliptic to ovate, base subcordate or truncate |
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(3) |
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Aerial leaves lanceolate to broadly lanceolate, base cuneate |
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(4) |
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| 3 (2) |
Petals marginally denticulate; carpels regularly arranged; styles 0.7-1.5 mm. |
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1 A. plantago-aquatica |
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Petals marginally undulate; carpels irregularly arranged; styles ca. 0.5 mm. |
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2 A. orientale |
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| 4 (2) |
Lateral pericarp thin, translucent; styles substraight; anthers 1-1.2 mm. |
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3 A. lanceolatum |
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Lateral pericarp thickish, opaque; styles recurved; anthers 0.5-0.8 mm |
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(5) |
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| 5 (4) |
Leaves ± falcate; achenes abaxially 1-canaliculate; styles not cirriform-recurved. |
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5 A. canaliculatum |
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Leaves not falcate; achenes abaxially 1- or 2-grooved; styles cirriform-recurved. |
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4 A. gramineum |
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Lower Taxa
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Treatments in Other Floras @ www.efloras.org
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