Plants cespitose, forming single or open colonies, each separated by 35-60 cm, acaulescent or rarely caulescent; rosettes usually small, mostly asymmetrical. Stems, when present, primarily rhizomatous, shorter than 1 m. Leaf blade spreading, including distal leaves, spatulate-lanceolate, concavo-convex, thin, widest near middle, 15-46 × 0.7-2 cm, flexible, rather glaucous, margins entire, filiferous, brown or straw-colored. Inflorescences racemose, rarely paniculate proximally, arising within or more often 0-20 cm beyond rosettes, 4-7 dm; branches, when present, few, short; bracts reflexed when mature, purplish, narrowly triangular, proximal to 10 cm, distal 2-3 cm, tapering to pungent apex; peduncle sometimes scapelike, 0.1-0.4 m. Flowers pendent; perianth campanulate; tepals distinct, white to somewhat greenish white, usually tinged pink or purple, broadly lanceolate, 3-4.7 × 1.5-3 cm; filaments 1.3-1.7 cm; pistil 2.4-3.2 cm × 0.5-0.8 cm; style pale green or rarely white, 9-13 mm; stigmas lobed. Fruits erect, capsular, dehiscent, cylindrical, deeply constricted near middle, 3-4.2 × 2-2.7 cm, dehiscence septicidal. Seeds dull black, thin, 6-8 × 5-8 mm.

Flowering spring--early summer. Exposed rocky ledges in woodlands and grasslands; 1500--2700 m; Colo., N.Mex., Okla.

Although J. L. Reveal (1977c) reduced Yucca neomexicana to a variety of Y. harrimaniae, the two taxa are morphologically and geographically distinct, and K. H. Clary´s (1997) DNA evidence supports their recognition as separate species.