Diuris sulphurea (Diuris sulphurea)
Description
Diuris sulphurea is a tuberous, perennial herb with up to three linear to lance-shaped leaves 200–500 mm (8–20 in) long and 3–4 mm (0.1–0.2 in) wide. Up to seven flowers 20–30 mm (0.8–1 in) wide are borne on a flowering stem 200–500 mm (8–20 in) tall. The flowers are bright yellow with a few prominent dark brown markings. The dorsal sepal is egg-shaped, erect or leaning forward, 15–20 mm (0.6–0.8 in) long and 9–13 mm (0.4–0.5 in) wide. The lateral sepals are green or green and brown, linear, 16–25 mm (0.6–1 in) long, 1–3 mm (0.04–0.1 in) wide, turned downwards and usually parallel to each other. The petals are erect or turned backwards with an egg-shaped blade 12–18 mm (0.5–0.7 in) long and 7–11 mm (0.3–0.4 in) wide on a dark brown stalk 5–8 mm (0.2–0.3 in) long. The labellum is 10–15 mm (0.4–0.6 in) long and has three lobes. The centre lobe is spade-shaped, 8–13 mm (0.3–0.5 in) long, 7–10 mm (0.3–0.4 in) wide and the side lobes are egg-shaped with the narrower end towards the base, 4–6 mm (0.16–0.24 in) long and 2.5–4 mm (0.1–0.2 in) wide. There is a ridge-shaped callus in the mid-line of the base of the labellum and extending about half way along. Flowering occurs from August to December.
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: Diuris
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