Xyris chapmanii E. L. Bridges & Orzell

Herbs, perennial, cespitose, occasionally solitary, 2--10(--11) dm, base bulbous to nearly bulbous. Stems compact. Leaves erect to ascending, 10--50 cm; sheaths pinkish, rugulose, papillate, or scabrous to nearly smooth, soft; blade dull green, linear, flattened, slightly to very twisted, 2.5--10 mm wide, smooth to papillate or scabrous, margins smooth to scabrous. Inflorescences: scape sheaths exceeded by leaves; scapes linear, terete, to 2.5 mm wide, smooth to minutely scabrous, 2--4-ribbed distally, ribs papillate to minutely scabrous; spikes prevalently ovoid-ellipsoid, (7--)10--17(--20) mm; fertile bracts 6--8 mm, margins entire, apex rounded. Flowers: lateral sepals included, slightly curved, 6--8 mm, keel scarious, lacerate to lacero-fimbriate; petals unfolding midday or afternoon, blade broadly obovate to nearly orbiculate, 3--5 mm; staminodes bearded. Seeds translucent, ellipsoid-cylindric, 0.6--1 mm, longitudinally multiribbed with fainter cross ribs. 2n = 18.

Flowering summer--fall. Sandy peats of deep pineland bogs and seeps, bog edges; 0--200 m; Ala., Fla., Ga., La., Miss., N.C., Tex.

Although I have seen no records from South Carolina, Xyris scabrifolia is to be expected there.

Several examples of what Bridges and Orzell have named Xyris chapmanii, together with a series of my own of this morph, show such intergradation that it is impossible to break the two out even as varieties.