Flowers, fruiting body, and leaves. Photo: Glen Leiper, Qld

Flowers and leaves. Photo: Glen Leiper, Qld

Common Name

Bull-head, Perennial Caltrop




Perennial forb, prostrate. Leaves opposite each other, occasionally alternating along the stems, composed of 6-10 pairs of leaflets, each 0.7-1.5cm long, 3-6mm wide, flat, hairy. Flowers yellow, with 5 petals, borne singly at the bases of the leaves. Fruiting bodies hairy, 5-angled, separating into 5 segments, each with 0-3 pairs of conical spines to 6mm long, mixed with short hard pointed or rounded protruberances.

Differs from Tribulus terrestris in that the individual sections of the fruiting body are 8-14mm long and have numerous spines.

Description and photo in G.M. Cunningham, WE Mulham, PL Milthorpe and J H Leigh (1981 and later printings) Plants of Western New South Wales pages 437-438

PlantNET description: