Scrambling herb or twining plant with glabrous stems to 3m. Crenate-serrate ciliated leaves to 75mm x 48mm glabrous but downy on veins beneath. Leafy terminal panicles or corymbs of 4-16 yellow flowers, yellow-greencalyx with glandular hairs, lobes 3mm x 2mm, whitre to pale yellow corolla to 18mm long, upper lip 4mm x 4mm, lower lip to 16mm x 10mm. Capsule to 7mm with persistent calyx.