Abstract
Greenwayodendron (Annonaceae) is a tropical African genus of trees occurring mainly in rain forests. Until recently, Greenwayodendron contained only two species: Greenwayodendronoliveri from West Africa and Greenwayodendronsuaveolens from Central and East Africa.Genetic data, using chloroplast haplotypes and nuclear microsatellites as well as morphometric analyses, provided important information on the delineation of species. Greenwayodendron now contains six species, including two new species (Greenwayodendronglabrum Lissambou, Hardy & Couvreur, sp. nov. and Greenwayodendronlittorale Lissambou, Dauby & Couvreur, sp. nov.). Greenwayodendronsuaveolensvar.gabonica and Greenwayodendronsuaveolenssubsp.usambaricum are recognised as distinct species: Greenwayodendrongabonicumcomb. nov. and Greenwayodendronusambaricumcomb. nov., respectively. A key, detailed descriptions of morphology and geographic distributions, as well as notes on their ecology and uses are presented for all species. Preliminary conservation assessments following IUCN criteria are also provided. Two species are preliminarily identified as threatened, one as Endangered and one as Vulnerable.
Highlights
The family Annonaceae (Magnoliidae) comprises trees, shrubs and lianas (APG 2003; Chatrou et al 2012; Couvreur et al 2015) that play a key ecological role in tropical forests (Gentry 1993)
Greenwayodendron is inferred with strong support as sister to a clade containing the genera Mwasumbia, Sirdavidia, Brieya, Polyceratocarpus and Piptostigma (Couvreur et al 2015; Ghogue et al 2017)
The different species of Greenwayodendron vary from large trees up to 45 metres tall (G. suaveolens) to small trees, no higher than 5 m (G. littorale)
Summary
The family Annonaceae (Magnoliidae) comprises trees, shrubs and lianas (APG 2003; Chatrou et al 2012; Couvreur et al 2015) that play a key ecological role in tropical forests (Gentry 1993). Inner and outer petals subequal, 8.0–24.6 mm long, 1.3–3.5 mm wide, length:width ratio 0.5–0.9, narrowly ovate to elliptic, apex acuminate, base rounded, green maturing pale yellow, outside tomentose, trichomes 0.1–0.5 mm long, erect, inside sparsely pubescent to glabrous; glabrous part to 2–8 mm long.
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