Tree Spider Orchid
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Tree Spider Orchid
P Introduced Photo: Kalyan Brata Santra
Common name: Tree Spider Orchid
Botanical name: Dendrobium tetragonum    Family: Orchidaceae (Orchid family)
Synonyms: Callista tetragona, Dendrocoryne tetragonum, Tropilis tetragona

Tree Spider Orchid is a tree-dwelling or rock-dwelling orchid with drooping pseudobulbs 15-60 cm long and 6-9 mm wide. The pseudobulbs have a thin, wiry base but expand to a fleshy, four-sided upper section and a tapering tip with 2-5 thin but leathery leaves. The leaves are 5-9 cm long and 1.5-4 cm wide. The flowering stems are 1-3.5 cm long and bear up to eight flowers. The number, size and color of the flowers depend on subspecies. Flower size ranges from 3 to 12 cm long and 2-8 cm wide. The flowers range in color from green to pale yellow, sometimes with red blotches and a lip that ranges in color from white, to yellowish with red, brown or purplish markings. The sepals are 2-7 cm long and 2-5 mm wide and the petals are 1-4 cm long and 1-2 mm wide. The lip is 0.8-1.5 cm long and 0.6-2 cm wide. Tree Spider Orchid is native to Australia, cultivated in NE India. Flowering: April-November.

Identification credit: Kalyan Brata Santra Photographed in Kaziranga Orchid Garden, Assam.

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