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1. Petals not narrowing to a claw at the base; flowers regular, closing at night.
2. Sepals usually joined and turned to one side; ovaries and immature fruits 4-grooved; stigmas 1-6 mm long........................C. amoena
2. Sepals staying fused in 2's or coming free, not turned to one side; ovaries and immature fruits 8-grooved, stigmas about 1.5 mm long...................C. purpurea
1. Petals with a distinct, narrow claw at the base; flowers slightly irregular, not closing at night.
3. Petals 3-lobed; fertile stamens 4; leaves often alternate........................C. pulchella
3. Petals not 3-lobed; fertile stamens 8; leaves opposite........................C. rhomboidea
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