Xyris chapmanii E. L. Bridges & Orzell

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.

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.

Ala., Fla., Ga., La., Miss., N.C., Tex.

Flowering summer--fall.

Sandy peats of deep pineland bogs and seeps, bog edges; 0--200m.

Xyris chapmanii E. L. Bridges & Orzell

Xyris scabrifolia Harper, Bull. Torrey Club 30: 325. 1903
Solitary 'according to Harper ) ; leaves linear, 25-40 cm. long, 3-4 (-5 ) mm. broad, somewhat incrassate and obtuse at the apex, tuberculate-scabrid at margins, elsewhere transversely rugose; sheath occupying one fourth to one third the length of the leaf, scabrid, opaque, somewhat dilated at the base; peduncles 50-70 cm. tall, 1-1.75 mm. broad, terete or nearly so, bicostate above, transversely rugose, the peduncular sheath 10-15 cm. long, rusty or chestnutcolored and somewhat shining below; spike many-flowered, ellipsoid, 10-14 mm. long, about 7 mm. thick, the outer barren bracts broadly elliptic, 2.5-3 mm. long, rounded at the apex, the flowering bracts broadly obovate, about 7 mm. long, 5-6 mm. broad, entire, tawny or palechestnut-colored, somewhat shining, with a large ovate dorsal, area 2.5-3 mm long; lateral sepals narrowly lanceolate-linear, acute at the apex; keel narrow, serrulate or lacerate only above; seeds ellipsoid, about 0.5 mm. long.
Type locality: Open bog, near Woodbury, Meriwether County, Georgia. Distribution: Known only from the type locality.

Xyris scabrifolia là một loài thực vật hạt kín trong họ Hoàng đầu. Loài này được R.M.Harper miêu tả khoa học đầu tiên năm 1903.