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Key to Lotus

Fabaceae

Lotus

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1 Leaves 3-foliolate, the upper commonly 1-foliolate; flowers solitary in leaf axils
1 Leaves 5-foliolate; flowers in umbels.
  2 Inflorescences (4-) 5-15-flowered; stems hollow; perennials from rhizomes
  2 Inflorescences (1-) 3-8 (-10) flowered; stems solid; annuals or perennials from taproots (rarely rhizomatous).
    3 Calyx tube 2.8-3.5 mm long; corolla 10-17 mm long; leaflets of the medial leaves mostly 1.5-2.5 (-5)× as long as wide
    3 Calyx tube 1.8-2.8 mm long; corolla 7-10 mm long; leaflets of the medial leaves 3-4 (-6)× as long as wide