Chasmanthium sessiliflorum (Poiret) Yates var. sessiliflorum . Longleaf Spikegrass. Phen: Aug-Oct. Hab: Moist to dryish hardwood forests, swamps, other moist habitats. Dist: Se. VA, n. TN, n. AR, and e. OK south to sc. peninsular FL and ec. TX.

Origin/Endemic status: Endemic

Taxonomy Comments: This species and C. laxum are morphologically somewhat similar, but their treatment as infrataxa of a single species is completely unwarranted. They frequently co-occur (especially on the Gulf Coastal Plain), growing side by side, and show no sign of intergradation.

Synonymy: < Chasmanthium laxum (L.) Yates ssp. sessiliflorum (Poir.) L.G.Clark – Mo1; < Chasmanthium laxum (L.) Yates var. sessiliflorum (Poir.) L.G.Clark – NcTx, WH3, Wipff & Jones (1994); < Chasmanthium sessiliflorum (Poir.) Yates – Ar, C, FlGr, FNA25, GW1, K1, K3, K4, Tn, Tx, Va, W, Yates (1966a), Yates (1966c); < Uniola longifolia Scribn. – S, S13; < Uniola sessiliflora Poir. – F, G, HC, RAB

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Wetland Indicator Status:

• Atlantic and Gulf Coastal Plain: FAC (taxonomic split from wetland indicator species)
• Eastern Mountains and Piedmont: FAC (name change)
• Great Plains: FAC (taxonomic split from wetland indicator species)
• Midwest: FAC (taxonomic split from wetland indicator species)

Heliophily: 4