An inconspicuous plant with a slender stem with a terminal head of delicate, tiny pink flowers, each 4–9.5 mm across. The flowers are generally 2-lipped, the lower lip being larger than the upper and each flower having a spur ½ its length. Leaves are opposite and sessile.
Subsp. brachystemon (not pictured) is similar but with smaller flowers (1–3.5 mm across), white to palpe pink and with a spur that is no more than a minute swelling.