Plukenetia (Hassk.) Mull. Arg.

Cardinal-McTeague, Warren M. & Gillespie, Lynn J., 2020, A Revised Sectional Classification of Plukenetia L. (Euphorbiaceae, Acalyphoideae) with Four New Species from South America, Systematic Botany (Basel, Switzerland) 45 (3), pp. 507-536 : 517

KEY TO THE SPECIES Of PLUKENETIA SECT. HEDRAIOSTYLUS

1. Petioles> (1–) 3 cm long; leaf blades> (2–) 4 cm wide, base deeply cordate,stipels present adaxially at petiole apex; 0.5–1 mm long; capsules with strap-shaped wing 6–12 mm long on each carpel lobe; distributed in Southeast Asia............................................. 4. P. corniculata

1. Petioles <1 cm long; leaf blades <3.5 cm wide, base obtuse to truncate, hastate, or rarely sagittate, stipels present adaxially at petiole apex, 0.1–0.6 mm long, or absent; capsules with tubercle or wing # 3 mm long on each carpel lobe; distributed in southern Africa............................ 2

2. Leaf blades narrowly triangular, lanceolate, or linear-lanceolate, 3–8 cm long, base often hastate; adaxial basilaminar extrafloral nectaries (0–)2, 0.2–0.3 mm in diam.............................................................................................. 3. P. africana

2. Leaf blades elliptic or ovate, 2–4.5 cm long, base obtuse to rounded; adaxial basilaminar extrafloral nectaries 2–12(–20), 0.2–0.8 mm in diam................................................................................................................ 5. P. procumbens