Thereianthus montanus J.C.Manning & Goldblatt

Plants 200-350 mm high. Corm 7-10 mm diam.; tunics of fine-textured, netted fibres accumulating with age. Stem erect, flexed outward above sheath of second leaf. Leaves 3 or 4, lowermost reaching or exceeding spike, linear, 150-300 x 2.5-2.8 mm, thick-textured with main vein evident but not thickened or raised when fresh, plus 1 or 2 evident secondary veins on each side, uppermost leaf well separated from spike, short and entirely sheathing. Spike erect, compact, densely 7-to 10-flowered; bracts overlapping, outer 6-8 mm long, obtuse to truncate, green and leathery below, dry and brown in upper 1/2, ± 2 internodes long, inner ± 1.5 mm shorter than outer, brown and papery with narrow darker zone along veins. Flowers suberect, purple, lower three or all tepals each with spear-shaped, purple median streak near base, throat and lower part of tube white; perianth subactinomorphic, salver-shaped; tube straight or slightly arching in upper ± 5 mm, 22-27 x 1.2-1.5 mm, cylindric and widening slightly in upper ± 5 mm; tepals spreading and slightly cupped, narrowly elliptical to lanceolate, subequal, 9-15 x 3.5-5.0 mm. Stamens unilateral; filaments erect, 6-8 mm long, exserted 3-4 mm from tube; anthers 4-5 mm long, purple; pollen violet. Style arching over stamens, dividing between base and middle of anthers, branches ± 2.5 mm long, divided for ± 1/2 their length. Capsules and seeds unknown.