Pseudobulbs ovoid-conic, ca. 3 × 1-1.7 cm, ± enclosed in sheaths, with 3-5 leaves. Leaf blade linear-lanceolate, 30-80 × 5-7 cm, petiole-like stalk 10-20 cm. Inflorescence to 100 cm, with many tubular sheaths; rachis 8-15 cm, 9-16-flowered; floral bracts reflexed, purple, ovate, ca. 1.5 cm. Flowers opening successively, purple; pedicel and ovary purplish, 25-35 mm. Sepals ovate, concave, 15-17 × ca. 9 mm, sparsely pubescent, apex acute; lateral sepals oblique. Petals subelliptic, ca. 18 × 13 mm, apex acute; lip 3-lobed, 16-23 mm, with 2 small, triangular, pubescent auricles at base of claw; disk with 2 short keels arising from base of lip; lateral lobes falcate, ca. 6 × 3 mm, apex dilated and truncate; mid-lobe dilated toward apex and flabellate, ca. 10 mm, apex subtruncate and often shallowly 2-lobed, with a distinct claw at base; claw and lower part of lip sometimes yellow; keels expanded toward apex into 2 large, fleshy, erect, rounded extensions terminating near base of claw, extensions pubescent adaxially. Column ca. 1.5 cm. Fl. Jan-Dec. 2n = 40, 42, 60.
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Pseudobulbs 40–60 × 20–40 mm. Leaves 3–4 per pseudobulb, on stalks 80–150 mm long, 500–900 × 80–150 mm, yellowish green to dark green, pleated. Flower stem 0.5–1 m long, hairy, 3–40-flowered. Flowers 35–55 × 35–55 mm, deep pink to purple. Dorsal sepal 20–30 × 8–12 mm, erect or slightly incurved. Lateral sepals 18–28 × 8–12 mm, divergent. Petals 20–30 × 12–18 mm, widely spreading. Labellum 20–30 × 12–15 mm, T-shaped when flattened; lateral lobes narrow, erect; midlobe with square or notched apex, base with 2 raised, hairy calli.
Highly localised; found growing among shrubs, tussocks and sedges in swamps, seasonally inundated areas, seepage sites and moist, grassy patches close to small streams, often in sunny situations.
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