Plukenetia, Cardinal-McTeague & Gillespie 2020

Gillespie, Lynn J., 2023, Plukenetia kwangoensis sp. nov. (Euphorbiaceae, Acalyphoideae, Plukenetieae), a new species of Plukenetia L. sect. Hedraiostylus (Hassk.) Müll. Arg. from Democratic Republic of Congo, Adansonia (3) 45 (9), pp. 141-149 : 148

KEY TO THE SPECIES OF PLUKENETIA SECT. HEDRAIOSTYLUS (modified from Gillespie 2007; Cardinal-McTeague & Gillespie 2020)

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; southeast Asia ..... ........................................................................................................................................... P. corniculata Sm.

— Petioles <1.5 cm long; leaf blades <3.5 cm wide, base obtuse, rounded, truncate, acute, attenuate, hastate, or rarely sagittate; stipels absent or present adaxially at petiole apex, 0.1-0.6 mm long; capsules with tubercle or wing 3 mm long on each carpel lobe; southern and central Africa ............................................................... 2

2. Leaf blades elliptic or ovate, 2-4.5 cm long, 1.3-3.3 cm wide, L/W = 1.2-1.7, bases rounded to broadly obtuse; Angola............................................................................................................................ P. procumbens Prain

— Leaf blades narrowly triangular, lanceolate, linear-lanceolate, or linear-oblong, 3-8 cm long, 0.2-1.5 (-3) cm wide, L/W = 2-10, bases acute, attenuate, truncate, hastate, rarely sagittate or obtuse ................................. 3

3. Petioles 2-9 mm long; stipels usually present adaxially at petiole apex; leaf blade secondary veins 2-8/side, bases often hastate; pistillate pedicels 3-10 mm long; Botswana, Mozambique, Namibia, South Africa, Zambia, Zimbabwe.................................................................................................................................. P. africana Sond.

— Petioles 0.5-1.5 mm long; stipels absent; leaf blade secondary veins 10-16/side, bases narrowly acute and often attenuate, never hastate; pistillate pedicels 1.4-1.8 mm long; Democratic Republic of the Congo.................. ............................................................................................................... P. kwangoensis L.J.Gillespie , sp. nov.