Twoleaf nightshade

Solanum diphyllum L. (Solanaceae), the twoleaf nightshade or African nightshade, is an evergreen unarmed shrub 1-2 m tall, native to Mexico and Central America and widely naturalized in tropical and subtropical regions of the Americas, the Caribbean, parts of Asia and the southern United States, where it grows in disturbed forest edges, hedges and waste places. The slender greyish branches bear at each node a characteristic pair of unequal leaves: a larger primary leaf 4-12 cm long and a much smaller subordinate leaf 1-3 cm long, both glabrous, elliptic to lanceolate and with entire margins. The vernacular name twoleaf refers to this paired arrangement. Inflorescences are short extra-axillary leafless cymes of 3-10 small white star-shaped flowers about 6-8 mm across, with five reflexed corolla lobes and a central cone of yellow anthers. The fruit is a small globose berry 8-10 mm in diameter, ripening from green through yellow to bright orange and persisting on the plant, and is mildly toxic, especially when unripe.