Plant at fl. to 50 cm. tall. Lf to 10 mm. wide, channelled, ± distinctly keeled. Infl. to c. 10-fld. Per. c. 15 mm. long, lavender-blue with darker spots, especially on petals. Sepals and petals ovate-oblong, subacute, ± concave giving rounded appearance to fl. Labellum slightly spathulate. Column-arms terete to plano-convex in T.S.; cilia very ∞, white, arising from sides, back and top of arm and mostly standing higher than post-anther lobe; post-anther lobe narrow compared with maximum width of column, extending well above anther-tip, dark and tuberculate above the middle, margin us. yellow, finely denticulate, inclined to bend over anther though not thickened or incurved.