Leaf | Linear-oblong, slightly obtuse and unequally bilobulate at apex, 2.0–2.5 cm wide, 10–15 cm long, dark green | Oblong-elliptic to linear-oblong, acute and tridenticulate at apex, 1.8–2.2 cm wide, 15–25 cm long, dark green | Linear-oblong, slightly obtuse to rounded, unequally bilobulate at apex, 1.2–1.5 wide, 10–15 cm long, green | Linear-oblong, slightly obtuse to rounded, unequally bilobulate at apex, 2.0–2.5 wide, 15–25 cm long, dark green |
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Peduncle | 9 – 15 cm long, shortly pubescent, green, densely spotted brownish purple | 8 – 15 cm long, shortly pubescent, pale green, densely spotted dark maroon | 10 – 15 cm long, shortly pubescent, green, densely spotted brownish purple | 12–18 cm long, shortly pubescent, green, densely spotted brownish purple |
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Flower | 5.5 – 6.5 cm across | 6.5–8.0 cm across | 6.5–7.5 cm across | 8.0–10 cm across |
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Dorsal sepal | Ovate - elliptic to ovate, obtuse, 3.0 – 4.0 cm wide, 4.0 – 4.5 cm long, basal margins slightly recurved, apical margins incurved and undulate, purplish pink to white, with reddish purple veins | Broadly ovate to nearly round, obtuse, 4.7–7.0 cm wide, 4.5–5.7 cm long, apical margins slightly undulate, purplish pink to pale pink, with reddish purple veins | Ovate - elliptic, obtuse, 3.0 – 4.0 cm wide, 4.2 – 4.5 cm long, basal margins recurved, apical margins strongly incurved, white, with the central flushed red - purple, brown - yellow nerves at base | Ovate - elliptic, obtuse, 3.0–3.5 cm wide, 4.0–4.5 cm long, basal margins recurved, apical margins incurved and undulate, white, with reddish brown veins, yellow at base |
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Synsepal | Oblong - elliptic, subacute to obtuse, 2.0 – 2.5 cm wide, 3.5 – 4.0 cm long, pale yellow - green with reddish brown veins | Oblong - elliptic, subacute, 2.0 – 2.8 cm wide, 3.8 – 4.0 cm long, pale yellow - green with reddish brown veins | Elliptic, obtuse, 2.0 – 2.5 cm wide, 3.5 – 3.8 cm long, pale yellow to white with reddish brown veins | Oblong - elliptic, subacute, 2.0–2.3 cm wide, 3.5–4.0 cm long, pale yellow - green with reddish brown veins |
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Petal | Narrowly oblong, incurved, 0.8 – 1.0 cm wide, 3.8–4.5cm long, rounded and slightly twisted at apex, pale greenish yellow with brown veins | Oblanceolate to narrowly oblong, incurved, rounded at apex, 1.0 – 1.6 cm wide, 4.0–4.4 cm long, slightly twisted at apex, pale greenish yellow with brown veins | Narrowly oblong, incurved, rounded at apex, 1.0 – 1.2 cm wide, 4.0–4.5 cm long, undulate margins, pale greenish yellow with brown veins | Oblanceolate to narrowly oblong, incurved, rounded at apex, 0.8–1.0 cm wide, 4.5–5.0 cm long, undulate margins, pale greenish yellow with brown veins |
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Labellum | Saccate, tapering to narrow apex, 2.0–2.4 cm wide, 3.0–3.5 cm long, brownish yellow with reddish brown veins | Saccate, tapering to apex, 2.6–2.8 cm wide, 3.8–4.4 cm long, greenish yellow with purplish brown veins | Saccate, tapering to apex, 2.5–2.8 cm wide, 3.6–4.4 cm long, brownish yellow with reddish brown veins | Saccate, tapering to narrow apex, 2.3–2.5 cm wide, 3.0– 3.5 cm long, brownish yellow with reddish brown veins |
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Staminode | Obovate - obcordate, 0.9–1.0 cm wide, 0.9–1.0 cm long, rough surface, glittery, yellow color with raised yellow wart | Obovate, 1.0–1.1 cm wide, 1.0–1.2 cm long, thick, glabrous, white with a slightly raised yellow wart | Elliptic - obovate to obcordate, 1.0–1.2 cm wide, 1.0–1.1 cm long, thick, rough surface, brown - yellow with raised yellowish orange wart | Elliptic-obovate to obcordate, 1.0–1.2 cm wide, 1.2–1.5 cm long, thick, rough surface, glittery, yellow with raised yellowish orange wart |
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Flowering period | July–September | September–November | September–November | September–November |
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Distribution | Northern Thailand, Lampang province | Myanmar, southwestern China, and northern Thailand | Northern Vietnam | Central Laos, Bolikhamxai province |
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