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Key to Sanvitalia

Asteraceae

Sanvitalia

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1 Disc cypselas ± monomorphic within heads, all cypselas ± 4-angled to laterally compressed and none winged; ray corollas 1.5-2.5 mm long
1 Disc cypselas strongly dimorphic within heads with outer cypselas wingless, and inner 1-2-winged; ray corollas 2-9 mm long