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Key to Calyptocarpus

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1 Cypselae slightly dimorphic, those of the rays elliptic and with a relatively smooth surface and the margins with small, inconspicuous winglike projections, those of the discs muricate and deltoid in shape; lateral awns of both types ascending to slightly divergent; [widespread, with both native and non-native populations]
1 Cypselae monomorphic, not noticeably different in shape or texture, and the margins of both lacking small winglike projections; lateral awns of both types widely divergent or reflexed; [waif, s. FL]