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1 Plants with tap roots; cypsela faces uniformly glochidiate-hairy; corolla laminae 6-10 mm long; [west of Mississippi river] | |
1 Plants with fibrous roots; cypsela faces glabrous or minutely glandular-glochidiate (bearing small glands or small hair-like bristles); corolla laminae (6-)8-17 long; [east of Mississippi river] |