Parnassia grandifolia A.P. de Candolle. Limeseep Parnassia, Bigleaf Grass-of-Parnassus. Phen: Aug-Nov (-Dec). Hab: Fens, gravelly seepages, inland primarily or solely over calcareous, mafic, or ultramafic rocks; in the Coastal Plain in seepage over marl on nearly vertical river bluffs on the Cape Fear River (NC), and in acidic seepage bogs in pinelands. Dist: VA, WV, s. MO, and OK south to n. GA, Panhandle FL, s. MS (Sorrie & Leonard 1999), AR, and e. TX, primarily in the Appalachian and Ozarkian highlands. The discovery of populations of this species in Brunswick and Columbus counties, NC, was remarkable. In the Panhandle of FL and the West Gulf Coastal Plain of LA and TX it also occurs in wet savannas and pitcherplant bogs (MacRoberts, MacRoberts, & Jackson 2004), in FL sometimes in close proximity to P. caroliniana; Parnassia in Coastal Plain savannas should not necessarily be assumed to be P. caroliniana.

Origin/Endemic status: Endemic

Synonymy: = Ar, C, F, FNA12, G, GW2, K1, K3, K4, RAB, S, Tn, Tx, Va, W, WH3, WV, Alexander (1934b); > Parnassia floridana Rydb. – S13; > Parnassia grandifolia DC. – S13

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Wetland Indicator Status:

• Atlantic and Gulf Coastal Plain: OBL
• Eastern Mountains and Piedmont: OBL
• Great Plains: OBL

Heliophily: 7