Triumfetta obtusicornis Sprague & Hutch.

Prostrate or trailing perennial with branches about 1 m long; rootstock woody; branches rather sparsely-stellate-pilose. Leaf-blade up to 40 x 38 mm, broadly elliptic to very broadly ovate, apex obtuse or acute, base rounded or subcordate, margin crenate-serrate, sparsely stellate-pubescent on the nerves and veins, otherwise glabrous, 5-7 nerved from the base, venation reticulate on both sides; petiole up to 6 mm long, pilose; stipules 4-6 mm long, subulate, pilose. Flowers normally in 3-flowered cymes in the upper axils, the cymes often paired in each axil; peduncles up to 7 mm long, stellate-pubescent; pedicels similar, up to 8 mm long; bracts about 3 mm long, subulate, pilose. Sepals about 8 mm long, linear, hooded at the apex, with a rather stout subapical horn 1 mm long, rather densely stellate-pilose outside. Petals yellow, almost as long as the sepals, oblanceolate, pilose at the base. Androgynophore 0.3 mm long, glabrous, with suborbicular glands opposite the petal bases; annulus undulate, ciliate at the margin. Stamens 8-10; filaments 5-6 mm long. Ovary globose 2-locular, densely setulose, setulae with a single apical spinule; style about 8 mm long. Fruits 8 x 6 mm including the rather stiff bristles, elipsoid; bristles up to 5 mm long, stellately pubescent with a single terminal caduceus seta.