Three new species of Uvariodendron (Annonaceae) from coastal East Africa in Kenya and Tanzania

Dagallier, Léo-Paul M. J.; Mbago, Frank M.; Luke, W. R. Quentin; Couvreur, Thomas L. P.

doi:10.3897/phytokeys.174.61630

Cited by 1,119 publications

(27 citation statements)

References 38 publications

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“…The bowl persists as a live, leathery disc at least until the fruit is mature. A similar structure is found in Uvariodendron schmidtii Q.Luke, Dalgallier & Couvreur (Dagallier et al 2021) in which the three calyx lobes are distinct, but appear almost completely connate (the individual lobes can still be clearly discerned) forming a shallow saucer at anthesis, however this structure falls post-anthesis (Dagallier et al 2021) unlike in Lukea. The ancestor of Lukea may have had a similar calyx, which may have evolved by developing greater concavity, more complete loss of the calyx lobes, and persistence in the fruit.…”

Section: Placement Of Lukea In the Uvariopsis Cladesupporting

confidence: 61%

“…Further, in Hexalobus the petals are transversely plicate and united at the base, differing from those of Lukea which are unfolded and free. In the fifty years since publication of the Flora of Tropical East Africa account (Verdcourt 1971), a further 26 additional new species have been described, bringing the cumulative total of formally named species of Annonaceae to 106 (Vollesen 1980;Verdcourt 1986;Verdcourt & Mwasumbi 1988;Johnson et al 1999;Deroin & Luke 2005;Couvreur et al 2006;Couvreur et al 2009;Couvreur & Luke 2010;Marshall et al 2016;Johnson et al 2017;Gosline et al 2019;Dagallier et al 2021). It seems likely that additional species will continue to emerge for many years so long as taxonomists and botanical inventory work procede and natural habitat survives and is incompletely surveyed.…”

Section: Introductionmentioning

confidence: 99%

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Lukea gen. nov. (Monodoreae-Annonaceae) with two new species of shrub from the forests of the Udzungwas, Tanzania & Kaya Ribe, Kenya

Cheek¹,

Wq²,

Gosline³

2021

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A new genus, Lukea Gosline & Cheek (Annonaceae), is erected for two new species to science, Lukea quentinii Cheek & Gosline from Kaya Ribe, S.E. Kenya, and Lukea triciae Cheek & Gosline from the Udzungwa Mts, Tanzania. Lukea is characterised by a flattened circular bowl-shaped receptacle-calyx with a corolla of three petals that give the buds and flowers a unique appearance in African Annonaceae. Both species are extremely rare shrubs of small surviving areas of lowland evergreen forest under threat of habitat degradation and destruction and are provisionally assessed as Critically Endangered and Endangered respectively using the IUCN 2012 standard. Both species are illustrated and mapped. Material of the two species had formerly been considered to be possibly Uvariopsis Engl. & Diels, and the genus Lukea is placed in the Uvariopsis clade of the Monodoreae (consisting of the African genera Uvariodendron (Engl. & Diels) R.E.Fries, Uvariopsis, Mischogyne Exell, Dennettia Bak.f., and Monocyclanthus Keay). The clade is characterised by often conspicuous, finely reticulate quaternary nervation and incomplete or absent connective shields (in Annonaceae the connective shield is usually complete). Morphologically Lukea is distinct for its broad, turbinate, fleshy pedicel, a synapomorphy. It appears closest to the West African monotypic Monocyclanthus, sharing a trait unusual in the Annonaceae: the calyx in both genera forms a shallow bowl (calyx lobes are absent or vestigial), barely enclosing the base of the petals at anthesis, and persisting as a living, leathery disc at least until the fruit is mature. The placement of Lukea within the Uvariopsis clade is discussed.

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Section: Placement Of Lukea In the Uvariopsis Cladesupporting

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Lukea gen. nov. (Monodoreae-Annonaceae) with two new species of shrub from the forests of the Udzungwas, Tanzania & Kaya Ribe, Kenya

Cheek¹,

Wq²,

Gosline³

2021

Preprint

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“…Luke & Couvreur (Kaya Dzombo, EN B1ab(iii)+2ab(iii)) and Uvariodendron schmidtii W.R.Q. Luke, Dagallier & Couvreur (Longomwagandi, likely VU)(both Annonaceae, Dagallier et al . 2021), Croton kinondoensis G.W.Hu, V.M.Ngumbau & Q.F.Wang (Kaya Kinondo, likely CR, Euphorbiaceae, Ngumbau et al .…”

Section: Methodsmentioning

confidence: 99%

“…(Longomwagandi, likely VU)(both Annonaceae,Dagallier et al 2021), Croton kinondoensis G.W.Hu, V.M.Ngumbau & Q.F.Wang (Kaya Kinondo, likely CR, Euphorbiaceae, Ngumbau et al 2020), Saintpaulia ionantha H.Wendl. ssp.…”

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confidence: 99%

A taxonomic synopsis of unifoliolate continental AfricanVepris(Rutaceae) with three new threatened forest tree species from Kenya and Tanzania

Cheek

Luke

2022

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Descriptions and illustrations are presented for three new species to science, Vepris udzungwa Cheek, V. lukei Cheek (both Udzungwa Mts, Tanzania) and V. robertsoniae Cheek & Q. Luke (SE Kenyan kaya forests) in the context of a synoptic taxonomic revision, with an identification key to all the known unifoliolate taxa of Vepris in continental Africa. The remaining species are given skeletal taxonomic treatments (lacking descriptions). One widespread species in montane eastern Africa is renamed as Vepris simplex Cheek because its previous name, Vepris simplicifolia (Engl.)Mziray is predated by Vepris simplicifolia Endl. (basionym of Sarcomelicope simplicifolia (Endl.)T.G. Hartley, a widespread species of Australia, Lord Howe and Norfolk Islands, and of New Caledonia). Conservation assessments are presented for all species, or provisional conservation assessments are presented. Of the 13 taxa, 11 are considered threatened, of which six are VU, two EN and three CR, of which two are possibly extinct globally in the Uluguru Mts of Tanzania although not yet Red Listed on iucnredlist.org.

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“…Lukea Cheek & Gosline in E Africa (Cheek et al in press) and new species, e.g. of Uvariodendron (Dagallier et al 2021) also in E Africa, and in Cameroon, new species such as Uvariopsis dicaprio Cheek & Gosline (Gosline et al 2022), U. etugeana Dagallier & Couvreur (Couvreur et al in press) and Xylopia monticola D.M. Johnson & N. A. Murray (Johnson & Murray 2018) The genus Monanthotaxis is confined to subsaharan continental Africa (79 species), the Comores and Madagascar (Hoekstra et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Monanthotaxis bali (Annonaceae) a new Critically Endangered (possibly extinct) montane forest treelet from Bali Ngemba, Cameroon

Cheek

Darbyshire

Onana

2022

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Monanthotaxis bali is the only known, solely montane (occurring solely above 2000 m alt.) species of the genus. It joins Monanthotaxis orophila (Rwanda) and M. discolor (Tanzania), two other species that can also occur above 2000 m alt. Monanthotaxis bali is an addition to the small number (28) of the tree species of the surviving montane forests of the Cameroon Highlands of which only eight other species are endemic. Due to its supra-axillary inflorescences, and petals arranged in one whorl but with the outer petals overlapping the inner petals distally, and rounded flower buds, the new species is placed in Monanthotaxis clade B of Hoekstra. The new species is unusual in being a treelet in a predominantly lianescent genus, and in lacking the glaucous underside of the leaf-blades that usually characterises the genus. Monanthotaxis bali takes the number of continental African species of the genus to 80, and makes Cameroon, with 30 species, the most species-diverse country for the genus. Monanthotaxis bali is known only from the Bali Ngemba Forest Reserve, a forest remnant under pressure of degradation and clearance in the Bamenda Highlands of Cameroon. It may already be extinct due to logging and agricultural activities. Here it is described, illustrated, mapped and assessed as Critically Endangered (Possibly Extinct) using the IUCN 2012 criteria.

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Three new species of Uvariodendron (Annonaceae) from coastal East Africa in Kenya and Tanzania

Cited by 1,119 publications

References 38 publications

Lukea gen. nov. (Monodoreae-Annonaceae) with two new species of shrub from the forests of the Udzungwas, Tanzania & Kaya Ribe, Kenya

Lukea gen. nov. (Monodoreae-Annonaceae) with two new species of shrub from the forests of the Udzungwas, Tanzania & Kaya Ribe, Kenya

A taxonomic synopsis of unifoliolate continental AfricanVepris(Rutaceae) with three new threatened forest tree species from Kenya and Tanzania

Monanthotaxis bali (Annonaceae) a new Critically Endangered (possibly extinct) montane forest treelet from Bali Ngemba, Cameroon

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