Allium tribracteatum var. diehlii
Dale W. McNeal Jr. & T. D. Jacobsen in Flora of North America (vol. 26)
Bulbs 1-5, not clustered on stout, primary rhizome, ovoid to globose, 0.7-1.5 × 0.6-1.4 cm; outer coats enclosing 1 or more bulbs, brown to grayish brown, membranous, usually distinctly cellular-reticulate, cells isodiametric or ± narrowly hexagonal, transversely elongate, without fibers; inner coats red to purple or white, cells obscure, quadrate to ± transversely elongate. Leaves usually persistent, green at anthesis, 2, basally sheathing, sheaths not extending much above soil surface; blade solid, flat or channeled, ± falcate, 8-27 cm × 1-3 mm, margins entire. Scape persistent, solitary, erect, solid, terete, 3-10(-20) cm × 1-3 mm. Umbel persistent, erect, compact, 8-25-flowered, hemispheric, bulbils unknown; spathe bracts persistent, 2, 7-10-veined, ovate, ± equal, apex acuminate. Flowers campanulate, 5-8 mm; tepals erect, white with prominent green to purplish midvein, lanceolate to elliptic, ± equal, becoming involute at tip and rigid in fruit, margins entire, apex obtuse to acuminate; stamens included; anthers yellow; pollen yellow or white; ovary crestless or obscurely crested; processes 3, low, rounded, central, margins entire; style linear, equaling stamens; stigma capitate, scarcely thickened, unlobed; pedicel 5-15 mm. Seed coat shining; cells smooth. 2n = 14. Flowering late Apr--Jul. Sandy, rocky soil; 1200--3300 m; Colo., Idaho, Mont., Nev., Oreg., Utah, Wyo.
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