Abstract
SummaryMischogyne (Annonaceae, tribe Monodoreae) is a genus of small- to medium-sized tropical trees and shrubs. It is characterised by a combination of: (1) stamens and carpels on a more or less extended torus; (2) carpels divergent from each other at the apex of the torus above the anthers; (3) anthers linear and anther connectives not expanded above the thecae; (4) inflorescences extra-axillary (or sometimes terminal in M. michelioides) with usually solitary flowers; (5) petals reflexed at anthesis (except M. michelioides), and (6) prominent reticulate tertiary veins. The genus is found in the lowland tropical rainforests of Africa with annual precipitation of 1000 – 4000 mm and in the dry coastal foothills of Angola. Five species and one variety of Mischogyne are recognised. One newly discovered species from the Eastern Arc Mountains, M. iddii, is described. The variety M. elliotiana var. glabra is reduced into synonymy with M. elliotiana var. elliotiana. Mischogyne elliotiana var. gabonensis is raised to species level as M. gabonensis. Specimens from the Congo are recognised as a new species, M. congensis. Preliminary conservation status assessments are provided for each species, as well as an identification key and detailed species descriptions. An unusual distribution pattern for the genus is discussed: dry coastal Angola as well as West, Central and East African wet forest.
Highlights
The unexpected identification of a new species of Mischogyne Exell from the Eastern Arc Mountains of Tanzania led us to undertake a revision of this genus, previously considered to have just two species
This is a contribution to the body of revisions of African genera of Annonaceae which have been published in recent years: Duguetia A.St.-Hil. (Chatrou 1998), Isolona Engl. and Monodora Dunal (Couvreur 2009), Huberantha Chaowasku, Annickia Setten & Maas (Versteegh & Sosef 2007), Hexalobus A.DC. (Botermans et al 2011), Neostenanthera Exell (Fero et al 2014), Uvariastrum Engl. (Couvreur 2014), Piptostigma Oliv. and Brieya De Wild. (Ghogue et al 2017), and new genera Mwasumbia Couvreur & D.M.Johnson and Sirdavidia Couvreur & Sauquet (Couvreur et al 2015)
Mischogyne is a genus of five species characterised by the combination of: (1) stamens and carpels on a more or less extended torus; (2) carpels divergent from each other at the apex of the torus above the anthers; (3) anthers linear and anther connectives not expanded above the thecae; (4) inflorescences extraaxillary with usually solitary flowers; (5) petals reflexed at anthesis, and (6) prominent reticulate tertiary veins
Summary
The unexpected identification of a new species of Mischogyne Exell from the Eastern Arc Mountains of Tanzania led us to undertake a revision of this genus, previously considered to have just two species. This is a contribution to the body of revisions of African genera of Annonaceae which have been published in recent years: Duguetia A.St.-Hil. (Chatrou 1998), Isolona Engl. This tribe contains eleven African genera whose phylogenetic relationships were studied by Couvreur et al (2008a). Mischogyne resolves within the tribe as sister to the subclade including Uvariodendron Mischogyne is a genus of five species characterised by the combination of: (1) stamens and carpels on a more or less extended torus; (2) carpels divergent from each other at the apex of the torus above the anthers; (3) anthers linear and anther connectives not expanded above the thecae; (4) inflorescences extraaxillary (or sometimes terminal in M. michelioides) with usually solitary flowers; (5) petals reflexed at anthesis (except M michelioides), and (6) prominent reticulate tertiary veins
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