Helianthus pauciflorus Nuttall ssp. pauciflorus . Stiff Sunflower. Phen: Jul-Oct. Hab: Prairies, disturbed areas. Dist: ON and MI west to SD and SK, south to w. KY, n. MS, and TX. Reported for VA by Fernald (1950) under the name H. laetiflorus var. rigidus and for nc. GA by Jones & Coile (1988) under the name H. rigidus.
Origin/Endemic status: Native
Synonymy: = Ar, FNA21, K1, K3, K4, NE; = Helianthus laetiflorus Pers. var. rigidus (Cass.) Fernald – F; = Helianthus pauciflorus Nutt. var. pauciflorus – C; = Helianthus rigidus (Cass.) Desf. var. rigidus – SE1; > Helianthus laetiflorus Pers. var. rigidus (Cass.) Fernald – Tx; < Helianthus pauciflorus Nutt. – Il, Mi, NcTx; > Helianthus rigidus (Cass.) Desf. – S
Heliophily: 9
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