22. Dalea purpurea Vent., Descr. Pl. Nouv.: tab. 40. 1801.

Lectotypus (designated here): UNITED STATES. Illinois: Michaux s.n. (G [G00341562]!; isolecto-: P [P 02141637, P 02141638]!, P-MICH [P00667210 in part]!).

Notes. – In the Ventenat herbarium, two specimens have been found. One is clearly the one sent by Michaux from Illinois and the second is a sterile collection cultivated in Cels’s garden [G00341561]. We choose to designate as the lectotype the Michaux s.n. collection as it is fertile and better represents the morphology of Dalea purpurea . Michaux collections determined as Petalostemon violaceus Michx. and kept in P and P-MICH are considered as isolectotypes as they do represent the same collection that Ventenat received from Illinois which would be described by him as Dalea purpurea . In P-MICH [P00667210] only the collections on the far left and far right are type material.