Vigorous climbing vine, tropical to subtropical.
Aristolochia labiata flower has somewhat similar shape to Aristolochia ringens but has much bigger calyx which is dingy-yellow with purple veins. Tube of the flower is inflated, with 2-lipped limb; the upper lip is narrow, up to 4" long, and the lower lip expanded into a reniform lobe 4" long and 7" across. Leaves are large, up to 8" across.
It is important not to confuse Aristolochia brasilensis, a synonym of Aristolochia labiata, with "Brasilensis" cultivar of Aristolochia gigantea.