What is the plant
Dendrobium bigibbum is an epiphytic or lithophytic orchid with green or purplish pseudobulbs 200–1,200 mm (8–50 in) long and 15–20 mm (0.6–0.8 in) wide, often with purplish edges. Each pseudobulb has between three and five egg-shaped leaves 100–150 mm (4–6 in) long and 30–35 mm (1.2–1.4 in) wide. The arching flowering stems are 200–400 mm (8–20 in) long with between two and twenty lilac-purple, rarely bluish or pinkish flowers. The flowers are resupinate, 20–30 mm (0.79–1.2 in) long and 30–70 mm (1–3 in) wide, the size depending on the variety. The sepals are oblong to egg-shaped, 20–30 mm (0.79–1.2 in) long and 9–11 mm (0.35–0.43 in) wide. The dorsal sepal is upright or turned back and the lateral sepals spread widely apart from each other. The petals are broadly egg-shaped, 25–30 mm (0.98–1.2 in) long and wide. The labellum is 20–26 mm (0.8–1 in) long, 20–28 mm (0.8–1 in) wide and has three lobes. The side lobes are upright and the middle lobe has four or five ridges along its midline and a hairy patch in the middle. Flowering occurs from February to July
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