Chiloglottis trullata

Chiloglottis trullata, commonly known as the triangular ant orchid, is a species of orchid endemic to Queensland, Australia. It has two dark green leaves and a single small, green or pinkish flower with a shiny, dark reddish black, insect-like callus surrounded by reddish club-shaped calli covering most of the upper surface of the labellum.

Description
Chiloglottis trullata is a terrestrial, perennial, deciduous, herb with two ground-hugging, dark green, oblong to elliptic leaves 50-80 mm long and 15-25 mm wide on a petiole 3-5 mm long. A single green or pinkish flower 8-10 mm long and 5-6 mm wide is borne on a flowering stem 50-75 mm high. The dorsal sepal is spatula-shaped, 10-11 mm long and about 2 mm wide. The lateral sepals are linear, 9-10 mm long, about 1 mm wide and curve downwards and away from each other. There is a glandular tip about 1 mm long on the end of all three sepals. The petals are linear to lance-shaped with the narrower end towards the base, 8-9 mm long, about 2.5 mm wide and turn downwards towards the ovary. The labellum is broadly trowel-shaped, 7-8 mm long and 5-6 mm wide. There is a shiny, dark reddish black, insect-like callus with a handlebar-shaped, stalked "head" end about 1.5 mm long and 2 mm wide. The callus and associated glands occupy most of the upper surface of the labellum. The column is pale green with a few purple spots, 7-8 mm long and about 3 mm wide with narrow wings. Flowering occurs in July and August.

Taxonomy and naming
Chiloglottis trullata was first formally described in 1991 by David Jones from a specimen collected in the Blackdown Tableland National Park and the description was published in Australian Orchid Research. The specific epithet (trullata) is a Latin word meaning "trowel", referring to the shape of the labellum.

Distribution and habitat
The triangular ant orchid grows near sandstone boulder in tall forest on the Blackdown Tableland.