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Key to Lotus

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1 Leaves 3-foliolate, the upper commonly 1-foliolate; flowers solitary in leaf axils; [native or alien annual herbs]
1 Leaves 5-foliolate; flowers in umbels; [alien perennial herbs].
..2 Calyx tube 2.8-3.5 mm long; corolla usually 10-14 mm long; leaflets of the medial leaves mostly 1.5-2.5 (-5)× as long as wide
..2 Calyx tube 1.8-2.8 mm long; corolla usually 8-10 mm long; leaflets of the medial leaves 3-4 (-6)× as long as wide