Plants 60-160(-220) mm high. Corm broadly obconic (triangular in outline), 10-15 mm diam., up to 40 mm below ground, tunics dark brown to blackish, basal margins with fine laterally extended teeth 1-3(-4) mm long, tunics often accumulating. Stem mostly 2-or 3-branched or unbranched; branches produced well above ground level, slightly compressed, oval in section, occasionally lightly or obscurely angled, angles smooth. Leaves 3 or 4, only lowermost well developed, straight and linear or falcate, usually ± as long as to twice as long as stem, rarely slightly shorter, 2-3(-4) mm wide, corrugately ribbed; remaining leaves < 1/2 as long as lowermost and progressively more bract-like above. Inflorescences spikes of 9 to 16 flowers, lateral spikes with fewer flowers, 2-ranked in bud, becoming spiral after anthesis; outer bract grey-green, transparent on veins, acute, 7-11 mm long, folded on midline but not keeled, apices acute and curving upward, inner bract 1/3-1/2 as long as outer, transparent with two green keels, forked at tip. Flowers zygomorphic, pale lilac-pink, lower tepals each with darker blotch or streak in midline and claw-like cusp near base, cusp ± white surrounded basally by red-purple zone, occasionally upper lateral tepals also lightly marked in lower 1/2, lightly sweet-scented; perianth tube 10-15 mm long, slender below, curving outward and wider in upper 1/3; tepals narrowly lanceolate to ± linear, dorsal 9-11 x 2-3 mm, ± erect, upper laterals recurving from base, lower 3 united for ± 2 mm, extending horizontally below, flexed downward distally. Stamens unilateral, ± erect; filaments ± 6 mm long, exserted ± 3 mm from tube; anthers ± 3 mm long, parallel, light purple; pollen ± white. Style straight, adaxial to stamens, dividing between middle and apex of anthers; branches ± 2.5 mm long, deeply divided and recurved. Capsules globose-trigonous, ± 4-5 mm long. Seeds globose, 1.6-2.0 mm diam., smooth, brown, glossy.
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Cormous geophyte, 70-250 mm tall, stems simple or branching above, corm tunics blackish, margins with horizontal spines. Leaves sword-shaped, ribbed. Flowers in a lax, few-flowered spike, lilac to mauve, fragrant, perianth tube cylindrical, the lower tepals each with a filiform cusp near base, bracts short, curving upward. July-early Sept.