Description from Flora of China
Coffea robusta L. Linden.
Small trees or shrubs, 4-8 m tall; branches flattened becoming subterete, glabrous. Petiole 10-20 mm, glabrous; leaf blade drying thickly papery, elliptic, elliptic-oblong, or occasionally ovate-oblong, (12-)15-30(-40) × (4.5-)6-12(-22) cm, glabrous on both surfaces, base cuneate to obtuse, margins flat or occasionally crisped-undulate, apex acuminate with tip 10-18 mm; secondary veins (8-)10-12(-17) pairs, without domatia or with glabrous foveolate domatia; stipules triangular, 6-18 mm, obtuse to acute, aristate. Inflorescences with cymes 1-3(-7) in each axil, each cyme subcapitate to fasciculate, 3-6-flowered, subsessile to pedunculate with peduncles to 7 mm; bracts cupular, 1-3 mm; pedicels to 2 mm. Calyx glabrous; ovary portion ellipsoid, 1-2 mm; limb reduced or denticulate, 0.1-0.5 mm. Corolla white to pink, funnelform, outside glabrous; tube 5-16 mm; lobes (4 or)5-7(or 8), spatulate to narrowly elliptic, 8-19 mm, obtuse to rounded. Drupe red, subglobose, 10-12 × 10-12 mm, smooth when dry, glabrous. Fl. Apr-Jun, fr. Oct-Dec.
This species is diploid and is cultivated as "Robusta Coffee." It has been widely hybridized with several other species to produce commercial coffee plants.
Cultivated in moist, often warm tropical regions. Fujian, Guangdong, Hainan, Yunnan [widespread in tropical Africa; commonly cultivated worldwide].