Allium constrictum (Ownbey & Mingrone) P. Peterson, Annable & Rieseberg
Family: Amaryllidaceae
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Bulbs 1-5+, not clustered on stout, primary rhizome, ovoid, 1-1.5 × 0.8-1.4 cm; outer coats enclosing 1 or more bulbs, brownish, membranous, lacking cellular reticulation or cells arranged in only 2-3 rows distal to roots, ± quadrate, without fibers; inner coats white, cells obscure, quadrate. Leaves usually persistent, green at anthesis, 2, basally sheathing, sheaths not extending much above soil surface; blade solid, flat, broadly channeled, falcate, 10-35 cm × 1-3(-5) mm, margins entire. Scape persistent, solitary, erect, solid, terete, enlarged apically but distinctly constricted just proximal to inflorescence, 15-20 cm × 1.5-4 mm. Umbel persistent, erect, compact, 15-30-flowered, hemispheric to globose, bulbils unknown; spathe bracts persistent, 3, 5-7-veined, ovate, ± equal, apex acute. Flowers ± stellate, 7-8 mm; tepals spreading, light pink to rose with prominent green or reddish midribs, narrowly lanceolate, ± equal, becoming papery in fruit, margins entire, apex acuminate; stamens exserted; anthers blue-gray; pollen light blue to gray; ovary crested; processes 6, 2 per lobe, low, rounded, margins entire; style exserted, linear; stigma capitate, unlobed; pedicel 10-20 mm. Seed coat shining; cells smooth. 2n = 14. Flowering May--Jul. Shallow, lithosolic soils, often dry and sandy; of conservation concern; 300--500 m; Wash. Allium constrictum is known only from Douglas, Grant, and Lincoln counties.