Dendrobium tetragonum A.Cunn. ex Lindl.

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Dendrobium tetragonum, commonly known as the tree spider orchid, is a variable species of epiphytic or lithophytic orchid endemic to eastern Australia. Tree spider orchids are unusual in having pendulous pseudobulbs that are thin and wiry near the base then expand into a fleshy, four-sided upper section before tapering at the tip. There are only a few thin but leathery leaves at the end of the pseudobulbs and up to five flowers on relatively short flowering stems. To allow for the variations in the species there are five subspecies and a variety, some with a unique common name.

 

Description

Dendrobium tetragonium is an epiphytic or lithophytic herb with pendulous pseudobulbs 150–600 mm (6–20 in) long and 6–9 mm (0.2–0.4 in) wide. The pseudobulbs have a thin, wiry base but expand to a fleshy, four-sided upper section and a tapering tip with between two and five thin but leathery leaves. The leaves are 50–90 mm (2–4 in) long and 15–40 mm (0.6–2 in) wide. The flowering stems are 10–35 mm (0.4–1 in) long and bear up to eight flowers. The number, size and colour of the flowers depend on subspecies. Flower size ranges from 30 to 120 mm (1.2 to 4.7 in) long and 20 to 80 mm (0.79 to 3.1 in) wide. The flowers range in colour from green to pale yellow, sometimes with red blotches and a labellum that ranges in colour from white, to yellowish with red, brown or purplish markings. The sepals range in size from 20 to 70 mm (0.79 to 2.8 in) long and 2 to 5 mm (0.08 to 0.2 in) wide and the petals from 10 to 40 mm (0.39 to 1.6 in) long and 1 to 2 mm (0.04 to 0.08 in) wide. The labellum ranges from 8 to 15 mm (0.31 to 0.59 in) long and from 6 to 20 mm (0.24 to 0.79 in) wide. Flowering occurs between April and November.

Dendrobium tetragonum - Wikipedia

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