Diuris behrii is a
tuberous,
perennial herb with between three and six grass-like, narrow linear leaves up to long. Up to four drooping, bright yellow flowers are borne on a flowering stem up to tall. The
pedicel of each flower is enclosed in a
bract. The
dorsal sepal is egg-shaped, up to long and leans forwards. It has dark streaks similar to those on the labellum. The
lateral sepals are greenish, linear to lance-shaped, up to long and turn downwards and parallel to each other. The
petals spread sideways or droop and are narrow egg-shaped to elliptic, up to long on a green, stalk-like "claw". The
labellum is up to long, often has brownish streaks, and has three lobes. The centre lobe is a broad wedge shape, often with irregular edges. The
lateral lobes are small and oblong with toothed edges. There are two ridge-like
calli about long near the mid-line of the labellum. Flowering occurs from September to November. ==Taxonomy and naming==