Tree, to 6 m tall, glabrous, heavily armed with axillary spines 5-27 mm long. Leaves simple; petioles narrowly margined, 5-7 mm long, ca 2 mm wide, articulate at apex; blades elliptic to oval, rounded to bluntly acuminate at apex, widely cuneate at base, 4-11 cm long, 1.5-6 cm wide, crenate. Flowers 5-parted, solitary or clustered in axils, 8-17 mm long; petals pinkish outside, white inside; stamens 20 or more; ovary tapered at apex. Fruits oblong to ovoid, 5-10 cm long, mammillate at apex, light yellow, somewhat roughened, sour; segments 8-10. Croat 10767.