Plants slender, 18-35 cm. Bulbs ca. 10 mm diam. Stems simple, rarely 1-branched. Leaves usually 3-4, basal leaves (0-)1-2; blade linear, ± reaching base of rhipidia, proximalmost cauline leaf blade linear, others reduced, bractlike. Rhipidia 1-2-flowered; outer spathe 18-22 mm, inner 25-30 mm, apex dry. Tepals pale blue, lanceolate, ca. 20 mm; filaments connate into tube, 1-2 mm; anthers (4-)6-8 mm; ovary oblong, 6-8 mm; style branching ca. 2 mm above apex of filament tube; branches ca. 2.5 mm. Capsules oblong, truncate, 10-15(-20) mm. Seeds compressed with winged angles, ca. 2.5 × 1.5 mm.

Flowering Apr--Jul. Limestone barrens, bluffs, wet prairies; Ark., Mo., Okla.

The flowers of Nemastylis nuttallii open ca. 5 P.M., and close ca. 7 P.M. The name N. coelestina (W. Bartram) Nuttall has long been used for this species, but in fact that name properly applies to a different entity, Ixia coelestina W. Bartram.