Diuris concinna is a
tuberous,
perennial herb, usually growing to a height of , although often up to when surrounded by
sedges. Between three and five linear leaves emerge at the base, each leaf long and wide. Up to five pale yellow flowers with brown markings, wide are borne on a flowering stem tall. The dorsal sepal is more or less erect, egg-shaped, long and wide. The
lateral sepals are linear to sword-shaped, green and purplish, long, about wide, turned downwards and parallel to each other. The
petals are curved backwards, spread apart from each other, sometimes almost horizontal, with an elliptic blade long and wide on a reddish-brown stalk long. The
labellum is long and has three lobes. The centre lobe is egg-shaped, long, wide and the side lobes are egg-shaped, long and wide. There are two ridge-like
calli long near the mid-line of the base of the labellum. Flowering occurs between September and December, reaching a peak in mid-October. ==Taxonomy and naming==