ເອື້ອງກະເປົາກະເບື້ອລາວ / Butterfly Slipper Orchid

Lithophyte. Shoots crowded, 4-5- leaved; roots thick, villose. Leave pendent, mid-green, lighter green underneath, the sheathing part very finely and densely spoted with purple to the base, linear, 29-37 x 3.8-4.6 cm, apex obtuse, shortly decurved-apiculate. Inflorescence 1-flowered patent; peduncle 22-32 cm long, 7.6 mm diam. very short purple pubescent; floral bract light green, when flattened ligulate, 5.2 x 3.3 cm, glabrous. Pedicel with ovary light green, curved-fusiform 4.5 cm long, 9.7 mm diam., very short-purple pubescent. Flower c. 12 cm across; dorsal sepal white, more or less strongly flushed with light purple except along the margins, at the base with a bright yellow-green blotch, in the basal half with bold, ring shaped or U-shaped, deep red-purple spots with a lighter centre; synsepal light green; petals glossy light brown to light greenish brown, with mush darker brown mid-vein, the other veins darker but less so than the mid-vein  with or without a few small dark brown dots in the basal half; lip white at the base, inside with purple hairs, the pouch glossy light brown, somewhate darker and more reddish brown the petals; column white with purple hairs, the knob on the staminode bright deep yellow; pollen masses deep dull yellow. Dorsal sepal suborbicular, held almost flat up right, 8.4 x 8.6 cm, apex emarginate, mucronate. Synsepal narrowly ovate, 6.8 x 3.1 cm, subacute. Petals wide-spreading to somewhat incurved, narrowly oblanceolate, 7.7 x 1.8 cm, apex rounded, margins slightly undulate, at base below the mid-vein with a small patch of long hairs, at apex slightly pubescent. Lip 6.5 x 3.9 cm; claw 2.1 cm wide, inside in basal part coarsely pubescent; the pouch gradually tapering to the obtuse apex, 2.9 cm long from front rim to apex. Column finely pubescent, including both sides of the staminode, stigma glabrous, broadly ovate 1.2 x 1.0 cm; staminode broadly ovate-subcordate, 1.7 x 2.0 cm, apex (i.e., the side closest to the dorsal sepal) emarginate, base indistinctly 3-lobed, margins incurves except at the base.