Chiloglottis trapeziformis, commonly known as the broad-lip bird orchid, diamond ant orchid or dainty bird-orchid, is a species of orchid endemic to south-eastern Australia. It has two narrow leaves and a narrow, greenish to purplish or brownish flower with a short, shiny black, ant-like callus covering the lower quarter of the diamond-shaped labellum. It has been recorded as a vagrant in New Zealand.

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