Climbing shrub. Leaves to about 14 cm long, elliptic, hairless. Stalk to 6 cm long. Calyx to about 6 cm long, with 4 unequal lobes. Flowers yellow, to about 20 cm long, cup-shaped, with a 5-veined tube, lobes 5, bent backwards. Stamens attached in the tube.
Mexico, C America
S. guttata is sometimes united with this species.
Source: (2002). Solanaceae. In: . Horticultural Flora of South-eastern Australia. Volume 4. Flowering plants. Dicotyledons. Part 3. The identification of garden and cultivated plants. University of New South Wales Press.