Sticky nightshade

Solanum sisymbriifolium, commonly known as sticky nightshade, litchi tomato, or in South America as tutia or revienta-caballo, is a much-branched, prickly perennial herb or short-lived subshrub of the family Solanaceae, native to subtropical South America (Argentina, Paraguay, Uruguay and southern Brazil) and naturalised as a weed in many warm regions of the world. It commonly grows 0.5–1.5 m tall, with erect, glandular-pubescent, viscid stems that are densely armed with straight, yellowish prickles 5–15 mm long. The alternate leaves are deeply pinnatifid to bipinnatifid, ovate in outline, 6–20 cm long, with glandular hairs and prickles on the veins of both surfaces. The inflorescence is a few-flowered raceme of showy star-shaped flowers about 2.5–3.5 cm across, with white to pale violet corollas and bright yellow exserted anthers. The fruit is a globose berry 1.5–2.5 cm across, enclosed in a prickly accrescent calyx, ripening from green to bright scarlet and containing numerous flattened seeds; the ripe pulp is edible and sweet.