Goodenia janamba is an erect herb that typically grows to a height of about . The leaves are linear to lance-shaped with the narrower end towards the base, mostly at the base of the plant, long and wide. The flowers are arranged in umbels or leafy racemes up to long with linear bracts long, each flower on a pedicel long. The sepals are triangular, about long, the corolla yellow or purplish with a yellow centre, long. The lower lobes of the corolla are long with wings about wide. Flowering mainly occurs from April to July and the fruit is more or less spherical capsule about in diameter.
