Plukenetia, Card.-McTeag. & L.J.Gillespie

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 : 518

KEY TO THE SPECIES Of PLUKENETIA SECT. MADAGASCARIENSES

1. Styles entirely connate, 3.5–5.5 mm long, stylar column obconic or obovoid, free style arms absent; androecia 0.6–1 mm long, anthers 15–20; inflorescences thyrses, terminal and appearing leaf-opposed, staminate flowers in distinct cymules; glandular knobs absent at petiole apex.......................................................................................................................... 6. P. ankaranensis

1. Styles 55–60% connate, entire style 8–16 mm long, stylar column cylindrical, free style arms slender, tapered; androecia 1.6–4 mm long, anthers 18–60+; inflorescences very narrow thyrses or racemes, axillary or terminal, staminate flowers single per node or in condensed cymules; glandular knobs 1–2 at petiole apex, sometimes minute.................................................................................................. 2

2. Inflorescences terminal racemes, staminate flowers single per node; bracts triangular, 1–2 mm long, sessile, eglandular; androecia 1.6–1.8 mm long, anthers 18–30 on oblong-ellipsoid receptacle; leaf blades triangular-ovate or ovate......................................... 7. P. decidua

2. Inflorescences axillary thyrses, staminate flowers in condensed cymules; bracts lanceolate, 3–8 mm long, usually petiolate and 2-glandular; androecia 3–4 mm long, anthers 35–60 + on narrowly conical receptacle; leaf blades broadly ovate or orbicular...................................................................................................... 8. P. madagascariensis