Tribulocarpus dimorphanthus (Pax) S.Moore

A grey-green densely papillose subshrub up to 50 cm. high.. Leaves obovate-spathulate or obovate, entire, retuse, rounded or obtuse, often mucronulate, at apex, cuneate at the base, petiolate. Blade 4–25 mm. long, 4–14 mm. broad; petiole 3–11 mm. long.. Flowers sessile, white or yellow, congested, on a peduncle 3–30 mm. long.. Fruit subspherical, spiny, the spines representing indurated bracts.. Fig. 11/5–6, p. 33.