Cooperia chlorosolen Herbert, Edwards’s Bot. Reg. 22: plate 1835. 1836; C. drummondii Herbert; C. kansensis W. Stevens; Zephyranthes brazosensis Traub; Z. herbertiana D. Dietrich

Leaf blade dull green, to 5 mm wide. Spathe (3–)4–5(–5.7) cm. Flowers erect; perianth white, sometimes tinged or veined pink, salverform, (7.3–)9–14(–16) cm; perianth tube primarily white, sometimes pale green proximally, (7–)8–12(–13) cm, diam. uniform, 3/4 or more perianth length, at least 15 times filament length, ca. 2–4 times spathe length; tepals rarely reflexed; stamens fasciculate, appearing equal; filaments subulate, 0.2–0.5 mm, apex blunt; anthers 4–8(–9) mm; style longer than perianth tube; stigma capitate, among or very near anthers, exserted no more than 2 mm beyond anthers; pedicel absent or rarely 0.1 cm and much shorter than spathe. 2n = 48, 60, 68, 72.

Flowering late spring--early fall (May--Oct). Wide range of soils and conditions, usually not very wet; 0--2400 m; Ala., Ark., Kans., La., Miss., Okla., Tex.; e Mexico.