Tablelands greenhood (Pterostylis abrupta)
Description
Pterostylis abrupta, commonly known as the tablelands greenhood, is a species of orchid endemic to New South Wales. It is distinguished from similar greenhood orchids by its thick, flat, platform-like sinus and blunt labellum which is only just visible above the sinus. Pterostylis abrupta is a terrestrial, perennial, deciduous, herb with an underground tuber and a rosette of dark green, crinkled leaves, each leaf 10–25 millimetres (0.4–1 in) long and 10–15 millimetres (0.4–0.6 in) wide. A single flower 23–27 millimetres (0.9–1 in) long and 12–15 millimetres (0.5–0.6 in) wide is borne on a stalk 150–450 millimetres (6–20 in) high. The flowers are dark green, white and brown. The dorsal sepal curves forward with a thread-like tip 10–18 millimetres (0.4–0.7 in) long and with the petals forms a hood or "galea". The lateral sepals have a thread-like tip 30–40 millimetres (1–2 in) long and there is a protruding, platform like sinus between their bases. The labellum is 13–15 millimetres (0.5–0.6 in) long, 4 millimetres (0.2 in) wide, brown, blunt and just visible behind the sinus. Flowering occurs from December to April.
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: Pterostylis
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