Rocky roadside with Pinus virginiana, Schizachyrium scoparium, Phemeranthus piedmontanus, Trifolium virginicum, Packera paupercula, Hypericum prolificum, Parthenium auriculatum, Solidago nemoralis, Smilax rotundifolia, Lobelia spicata, Dichanthelium cf depauperatum, Oenothera cf fruticosa, Minuartia patula, Scleria paucifolia, Melica mutica, and Symphyotrichum cf dumosum. Groundwater surfaced and the thin soil was saturated and slick. Exposed fractured/eroded bedrock was red with sparkles and what appeared to be gas bubbles on the surface, light brown on the inside.

Variety confirmed (probably var. fissa, as I recall) by specimen in the 1990s (MICH, UARK). Found at the intersection of Tenn. Highway 96 and Natchez Trace Parkway, NW corner at end of walkway overlook from parking area. The general area was not searched further for additional plants. Obviously dominant in understory over at least 1/4 acre.