Caladenia alpina R.S.Rogers

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Caladenia alpina, commonly known as the mountain caladenia, is a plant in the orchid family Orchidaceae and is native to subalpine areas of south-eastern Australia and to New Zealand. It has a single fleshy leaf and a thin wiry flowering spike bearing two white flowers with red bars on the labellum. In New Zealand this orchid is sometimes known as Caladenia lyallii.

Caladenia alpina is a terrestrial, perennial, deciduous, herb with an underground tuber and a single, sparsely hairy, lance-shaped leaf, 9–28 cm (4–10 in) long and 5–8 mm (0.2–0.3 in) wide. The leaf is thick and fleshy and green to dark reddish-green.

One to three flowers, usually two, are borne on a spike up to 30 cm (10 in) high and are about 40 mm (2 in) in diameter. The dorsal sepal is a broad egg shape 4–8 mm (0.2–0.3 in) wide and curves forward to form a hood over the column. The petals and lateral sepals are broad, 12–20 mm (0.5–0.8 in) long and are white and glabrous on the front and pinkish red to maroon with glandular hairs on the back. The labellum is about 9 mm (0.4 in) long when flattened, white with dark red to purple spots and lines with a wavy margin, a few short teeth and a pointed tip. There are four well-spaced rows of calli on the surface of the labellum. The calli are club-shaped, yellow or whitish becoming darker and shorter towards the tip of the labellum. The column is about 7 mm (0.3 in) long with broad wings and has red spots or streaks.

Caladenia alpina - Wikipedia

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