It is a ground orchid with a single, densely hairy leaf and one or two white or pale yellow flowers with maroon tips.

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.

[2][3][4] Caladenia arenaria was first formally described by Robert FitzGerald in 1882 and the description was published in his book, Australian Orchids.

[6] Sand-hill spider orchid grows in sclerophyll forest and on sandhills, usually under cypress pine trees.