Bulb solitary or several aggregates, terete or subterete, with thicker roots; bulb outer skin gray-brown, often subparallel fibrous, sometimes reticulate. Leaves striate, abaxially keeled, usually shorter than scape, 2--5 mm wide. Scape terete, often with 2 longitudinal ribs, 13--35 cm tall, proximally sheathed with leaves; involucre unilaterally dehiscent, sparsely 2--3-lobed, persistent; umbel subflabellate, many-flowered, loose; pedicels unequal, from subequal to perianth segments up to 3 times as long as they are, basally ebracteolate; flowers purplish red to dark purple; perianth segments elliptic-rectangular, apex obtuse-rounded or retuse, 7--9 mm long, 3--4 mm wide, inner whorl slightly longer; filaments longer than flowers. slightly longer than inner whorl; filaments shorter than perianth segments, 4.5-5-8 mm long, 2/3-3/4 connate into a tube, base of detached part of inner whorl of filaments often shoulder-expanded, outer whorl narrowly triangular; ovary ovoid, outer wall with fine verruculose protuberances; styles not protruding from perianth; stigmas 3-lobed. Flowering and fruiting June-August.