Plants 300-700 mm high. Corm 30-60 mm diam.; tunics of densely matted fibres, with long collar. Stem erect, unbranched or rarely with single short erect branch, 2.0-3.5 mm diam. Basal leaves 1 to 3, usually green at flowering, blade linear or linear-lanceolate, 150-600 x 3-8 mm, acuminate, narrowed below, with 3 or 4 veins; cauline leaves 3 to 5, lower 2 or 3 subulate, upper 1 or 2 reduced to scales or vestigial. Spike moderately densely ± 5-to 18-flowered, 70-150 mm long; bracts dry and brown, leathery or papery and fairly soft, oblong or ovate-oblong, outer 6-16 mm long, acute or mucronulate, inner slightly longer. Flowers zygomorphic, pale to deep pink, lower 3 tepals with red median lozenge or streak flanked by white streaks, unscented; perianth tube narrowly funnel-shaped, 6-11 mm long; tepals unequal, dorsal larger, arched over stamens, recurved apically, oblanceolate-spathulate, clawed in lower half, 23-33 x 5-8(-12) mm, obtuse, other tepals recurved in distal half, 18-25 x 5-9 mm, upper laterals joined to lower laterals for ± 1 mm and lower 3 tepals joined at base for 5-7 mm. Filaments arcuate, later diverging, (15-)17-20 mm long; anthers 5-7 mm long, pink or yellow, with acuminate or bifid, often recurved apiculus 1-2 mm long. Style 26-28 mm long, dividing opposite middle of anthers, branches 3-4 mm long. Capsules ovoid, slightly inflated, 15-20 x 8-10 mm. Seeds up to 5 mm long, winged on angles.
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Like T. ramosa but more robust and rarely branched, dorsal tepal larger, 7-12 mm wide and longer than upper laterals.