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2 Corolla 14-20 mm long, slightly curved, the lobes 4-8 mm long and rounded-obtuse; inflorescence a dense raceme, the flowers in a dense and often irregular spiral; flowering Apr-Aug; [of uplands, usually parasitizing perennial composites such as Artemisia, Heterotheca, and Grindelia] | |
2 Corolla 14-22 mm long, strongly curved, the lobes 4-5 mm long and triangular-acute; inflorescence an open raceme, the flowers in a loose and regular spiral; flowering Aug-Oct; [of bottomlands, usually parasitizing annual composites such as Ambrosia and Xanthium] |