Orbexilum psoralioides (Walter) Vincent. Subgenus: Poikadenia. Common name: Eastern Sampson's-snakeroot. Phenology: May-Jul; Jul-Sep. Habitat: Longleaf pine savannas, loamy longleaf pine sandhills, open woodlands. Distribution: Primarily on the Atlantic Coastal Plain, ranging from e. VA to ne. FL and Panhandle FL, inland to the Piedmont of NC and SC.

Origin/Endemic status: Endemic

Taxonomy Comments: Vincent (2014) discussed the nomenclature in detail.

Synonymy ⓘ: = FNA11.1, K4, POWO, Vincent (2014); = Orbexilum gracile (Torr. & A.Gray) Rydb. — S, Turner (2008); = Orbexilum pedunculatum (Mill.) Rydb. var. gracile (Torr. & A.Gray) J.W.Grimes — C, SE3, Grimes (1988), Grimes (1990), Isely (1998); = Orbexilum pedunculatum (Mill.) Rydb. var. psoralioides (Walter) Isely — NS, Va; = Psoralea gracilis Torr. & A.Gray — S13; = Psoralea psoralioides (Walter) Cory var. psoralioides — F, G, GW2, RAB; < Orbexilum pedunculatum (Mill.) Rydb. — WH3; Trifolium psoralioides Walter. Basionym: Trifolium psoralioides Walter 1788

Links to other floras: = Orbexilum psoralioides - FNA11.1

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Wetland Indicator Status:

• Atlantic and Gulf Coastal Plain: FACU (taxonomic split from wetland indicator species)
• Eastern Mountains and Piedmont: FACU (taxonomic split from wetland indicator species)
• Great Plains: FACU (taxonomic split from wetland indicator species)
• Midwest: FACU (taxonomic split from wetland indicator species)
• Northcentral & Northeast: FACU (taxonomic split from wetland indicator species)

Heliophily ⓘ: 8