Bulbs 2–5+, clustered, often short-rhizomatous at base, rhizome not stout or iris-like, oblong, elongate, 1–3 × 0.8–1.5 cm; outer coats enclosing 1 or more bulbs, grayish or brownish, membranous, minutely striate, cells in regular vertical rows, narrowly elongate, fibers persistent, parallel, few; inner coats white to pink or reddish, cells in regular vertical rows, narrowly elongate. Leaves persistent, green at anthesis, 3–5, basally sheathing, sheaths not extending much above soil level; blade solid, flat, channeled to broadly V-shaped in cross section, 10–25 cm × 1–6 mm, margins entire or denticulate. Scape persistent, sometimes 2 or more produced successively from single bulb, usually clustered, nodding, solid, terete or ridged, particularly distally, sometimes flattened and narrowly winged, abruptly recurved near apex, 10–50 cm × 1–3 mm. Umbel persistent, cernuous, loose, 8–35-flowered, hemispheric, bulbils unknown; spathe bracts persistent, 2, 3-veined, lanceolate, ± equal, apex acuminate, beakless. Flowers campanulate, 4–6 mm; tepals ± erect, pink or white, elliptic-ovate, ± equal, withering in fruit, margins ± entire, apex ± obtuse, at least outer tepals strongly incurved, midribs not thickened; stamens exserted; anthers yellow; pollen yellow; ovary conspicuously crested; processes 6, flattened, ± triangular, margins entire or toothed; style exserted, linear, ± equaling stamens; stigma capitate, scarcely thickened, unlobed; pedicel 6–25 mm, becoming stouter in fruit, elongating and bending abruptly upward from near point of attachment. Seed coat dull or shining; cells smooth, minutely roughened, or each with minute, central papilla. 2n = 14.
"Bulb slenderly conic, very gradually tapering into the stem; lvs several, arising near together at the soil-surface, shorter than the stem, 2–4(–8) mm wide; scape 3–6 dm, abruptly declined near the top; umbel nodding (at least in bud), many-fld, without bulblets; pedicels 12–25 mm, becoming rigid; tep white to rose, ovate or elliptic, 4–6 mm, obtuse or subacute; stamens exsert; filaments barely widened at base; fr obovoid, 3-lobed, 4 mm, each valve (and each lobe of the ovary) bearing 2 erect triangular processes near the top; 2n=14. Dry woods, rocky banks, and prairies; N.Y. to Mich., Minn., and B.C., s. to Va., Ky., and Mo., and in the mts. to Ga., Ala., and Ariz. July, Aug. (A. allegheniense; A. oxyphilum Wherry, of shale-barrens, with few, whitish fls, may merit some recognition)"