About Caladenia thinicola Hopper & A.P.Br.
Caladenia thinicola is a terrestrial, perennial, deciduous herb that grows from an underground tuber. It produces a single erect, hairy leaf that measures 130 to 260 millimeters long and 5 to 7 millimeters wide. A 450 to 500 millimeter tall stalk bears up to four yellowish-green flowers with red markings; each flower is 70 to 90 millimeters long and 50 to 70 millimeters wide. The sepals of this orchid have thick, brown, club-shaped glandular tips. The dorsal sepal is erect, approximately 40 millimeters long and 2 millimeters wide. The lateral sepals are 40 millimeters long and 3 millimeters wide, spread apart from one another, and curve downwards. The petals measure about 35 millimeters long and 2 millimeters wide, and also curve downwards. The labellum is 15 to 16 millimeters long and 12 to 13 millimeters wide, yellowish-green with a dark red curled downward tip. Thin greenish teeth up to 8 millimeters long line the sides of the labellum, and four crowded rows of dark red calli up to 1.5 millimeters long run along the labellum's mid-line. Flowering takes place from September to November. This orchid, commonly called the Scott River spider orchid, occurs between Cape Naturaliste and the Warren River in the Jarrah Forest, Swan Coastal Plain, and Warren biogeographic regions. It grows in deep sand within coastal woodland habitats.
