Erect pencil orchid (Dendrobium racemosum)
Description
Epiphytic or lithophytic herb forming upright to straggly slender clumps. Stems erect to semi-pendulous, sparsely branched, 20-100 cm x 0.4-0.6 cm, tough, yellowish. Leaf terminal on stem, erect to pendulous, sessile; lamina terete, 8-20 cm x 0.8-1.2 cm, dark green, fleshy, shallowly grooved, apex obtuse. Inflorescence an axillary raceme, erect, 40-80 mm long, from node near leaf base; pedicels 15 mm long. Flowers 8-15, non-resupinate, porrect to nodding, star-shaped, 18-22 mm x 20-25 mm, cream to pale yellow with mauve anther. Sepals and petals recurving with age. Dorsal sepal obliquely erect, narrowly triangular, 20-25 mm x 2 mm, apex recurved. Lateral sepals divergent, narrowly triangular, 20-25 mm x 2 mm, bases fused to column foot. Petals divergent, linear, 20-25 mm x 1 mm. Labellum projected downwards, curved, 20 mm x 6 mm, 3-lobed; lateral lobes small, crescent-shaped; midlobe narrow, margins undulate or crinkled, apex caudate, 5 mm long, recurved or coiled; upper surface with 3 undulate ridges. Column 3 mm long. Column foot 5 mm long, almost in line with column. Capsules porrect to pendulous, dehiscent.
Taxonomic tree
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Domain: Eukarya
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Kingdom: Plantae
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Phylum:
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Class: Liliopsida
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Order: Asparagales
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Family: Orchidaceae
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Genus: Dendrobium
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