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1 Flowers solitary in leaf axils; petals absent; [calcareous seepage, KY, TN, n. AL]
..2 Stems prostrate or decumbent, leafy throughout; [of moist habitats]
....3 Seed surface pebbled-papillose; mature leaves narrowly lanceolate or oblanceolate, 1.5-3 mm wide; sepal nerves 3
......4 Plants perennial from woody crowns; leaves rigid, with axillary fascicles; stem and inflorescence axes strictly glabrous; sepal nerves 3
........5 Sepal nerves 3 (occasionally weakly 5), widely spaced, not appearing ribbed; inflorescences divaricately-branching at maturity, forming a diffuse tangled mound in robust specimens; seeds 0.8-0.9 mm across; flowering time centered May through June
........5 Sepal nerves 5, typically closely spaced and appearing elevated and ribbed (widely spaced in some specimens); inflorescences ascending to spreading at maturity; seeds 0.5-0.7 (-0.75) mm across; flowering time centered April through May