Arthur river greenhood (Pterostylis rubenachii)
Description
Pterostylis rubenachii, is a terrestrial, perennial, deciduous, herb with an underground tuber. It has a rosette of between four and six, elliptic to egg-shaped leaves, each leaf 15–20 mm (0.6–0.8 in) long and 6–10 mm (0.2–0.4 in) wide, lying flat on the ground. Between two and seven transparent green flowers with darker green stripes are crowded together on a flowering spike 30–80 mm (1–3 in) high with two or three stem leaves with their bases wrapped around it. The flowers are 8–9 mm (0.3–0.4 in) long and about 5 mm (0.2 in) wide. The dorsal sepal and petals are joined to form a hood called the "galea" over the column. The dorsal sepal is gently curved but suddenly curves downward near the tip and is about the same length as the petals. The lateral sepals turn downwards and are about 6 mm (0.2 in) long, 5 mm (0.2 in) wide and fused together forming a cup with tips about 1 mm (0.04 in) long. The labellum is about 3 mm (0.1 in) long, 2 mm (0.08 in) wide and whitish-green with a dark green, appendage. Flowering occurs in October and November.
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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