Large shrub or small tree sometimes with a trunk. Segments obovate or elongate, flattened, to 50 cm or so long, green to blue. Spines (0)1-several to 3 cm long. Flowers to 7 cm wide, yellow. Fruit to 10 cm long of various colours. [O. engelmannii Salm-Dyck]

Mexico

Widely cultivated for the edible fruit and occasionally naturalised in SA, Qld, NSW and Vic.

Source: Thompson, A, ; Forbes, S.; Spencer, R. (1997). Cactaceae. In: Spencer, R.. Horticultural Flora of South-eastern Australia. Volume 2. Flowering plants. Dicotyledons. Part 1. The identification of garden and cultivated plants. University of New South Wales Press.