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1 Ray flower blades (7-) 9-15 (-19) mm long, blue-violet (rarely white); involucres (4.5-) 5.5-7.1 (-8.5) mm high; [calcareous habitats, especially glades] | |
1 Ray flower blades (3-) 3.8-7.5 (-11) mm long, white (rarely slightly blue or violet); involucres (2.5-) 3.1-5.1 (-6.5) mm high; [various habitats, including glades]. | |
4 Stems sparsely to densely hairy with short pubescence; plants 3-10 dm tall; upper stem leaves with axillary fascicle shoots; [prairies, woodlands, barrens, and glades of n. IL and n. IA south to n. AR and ne. OK] |