Caladenia arenaria Fitzg.

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Caladenia arenaria, commonly known as the sand-hill spider orchid, is a plant in the orchid family Orchidaceae and is endemic to New South Wales. It is a ground orchid with a single, densely hairy leaf and one or two white or pale yellow flowers with maroon tips. Formerly much more widespread, it is now only known from about two thousand individual plants in five locations in the Riverina area and is classed as "Endangered".

Description

Caladenia arenaria is a terrestrial, perennial, deciduous, herb with a single underground tuber which is replaced annually. In late autumn or early winter a linear to narrow lance-shaped leaf is produced which is 15 cm (6 in) long, 6 mm (0.2 in) wide and reddish at the base.

One or (rarely) two pale yellow to creamy-white flowers are borne on a hairy spike up to 40 cm (20 in) high. The dorsal sepal, lateral sepals and petals are up to 80 mm (3 in) long, held horizontally or slightly drooping and tapering to dark reddish, thread-like ends. The labellum is egg-shaped to heart-shaped, about 18 mm (0.7 in) long and 10 mm (0.4 in) wide with teeth up to 3 mm (0.1 in) but decreasing in size towards the front of the labellum. There are four to six rows of calli, shaped like golf stick heads on the centre of the labellum. Flowering occurs from late August to November

Caladenia arenaria - Wikipedia

Occurrence 4600055280 (gbif.org)