Erect shrub to 2.7 m high with 1 or 2 stems, the branches often tinged with purple, branches and leaves glabrous, rarely with scattered glandular hairs; seedlings with prickles on stems. Leaves obovate to narrowly obovate-elliptic, occasionally spathulate or elliptic, sessile or almost so, 15–80 mm long, 7–35 mm wide, thick and fleshy, entire, or the juvenile leaves dentate. Inflorescence panicle-like, leafless except at base; pedicels 3–8 mm long. Calyx 4–8 mm long. Corolla 12–27 mm long, bright yellow, the striations purple to maroon; tube often tinged with purple outside; lobes linear, 6–18 mm long, 3–6 mm wide. Stamens 4–10 mm long. Capsule narrowly ovoid-ellipsoid, acute to apiculate, 11–21 mm long. Seeds 48–114 in all, 1.4–1.9 mm long.
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