≡ Uvariodendron molundense var. citrata Phylogenomic inference of the African tribe Monodoreae (Annonaceae) and taxonomic revision of Dennettia, Uvariodendron and Uvariopsis Dagallier, Leo-Paul M. J. Mbago, Frank M. Couderc, Marie Gaudeul, Myriam Grall, Aurelie Loup, Caroline Wieringa, Jan J. Sonke, Bonaventure Couvreur, Thomas L. P. PhytoKeys 2023 2023-09-22 233 1 200 C8MZ8 urn:lsid:ipni.org:names:77326967-1 (Le Thomas) Dagallier & Couvreur, comb. et Dagallier & Couvreur, comb. et 2023 Le Thomas Magnoliopsida Annonaceae Uvariodendron CoL Plantae Uvariodendron citriodorum Magnoliales 0 1 Tracheophyta species citriodorum stat. nov.   Figs 13 , 14   ≡ Uvariodendron molundense var. citrataLe Thomas, Fl. Gabon No. 16, 283 (1969). Type. Gabon - Ogooue-Ivindo• N. Halle525 (holotype: P! (P00363400), sheet here designated, isotypes: K! (K000198798, K000198799), MO! (MO216993, MO216994), P! (P00363398), WAG! (WAG0065739)), Belinga, mines de fer, sommet de Belvedere; 1°08'N, 13°12'E; alt. 800 m; 15 Aug. 1966.  Description. Tree to shrub 4-5 m tall, D.B.H. unknown; young branches glabrous, old branches glabrous. Leaves with strong lemon smell when crushed. Petiole 6-10 mm long, 1.5-3.5 mm wide, sparsely pubescent to glabrous. Leaf lamina (183) 250-337 mm long, 72-97 mm wide, length:width ratio 2.3-4.2, elliptic to oblong, coriaceous, base acute to rounded (sometimes minutely decurrent at the very base, and decurrent on young leaves), apex attenuate, surface above glabrous, surface below glabrous; midrib impressed above, raised below, glabrous above, sparsely pubescent to glabrous below; secondary veins 12-18 pairs, weakly brochidodromous, impressed above, raised below; tertiary veins reticulate. Inflorescences borne on branches or axillary, composed of 1 sessile flower. Flowers bisexual, buds globose, sessile, 5-6 mm high, 5-7 mm in diameter, velutinous. Mature flower unknown, measures taken from flower buds or fruits. Bracts 1 to 4, upper bract ca. 5 mm long, ca. 7 mm wide, broadly ovate, semi clasping the pedicel, velutinous outside, glabrous inside. Sepals 3, ca. 7 mm long, ca. 6 mm wide (measures taken from bud), imbricate, velutinous outside, glabrous inside, color unknown. Outer petals 3, length, shape, indumentum and color unknown. Inner petals 3, length, shape, indumentum and color unknown. Stamens number unknown, ca. 1 mm long, ca. 0.2 mm wide, anthers linear, connective prolongation truncate. Carpels 10 to 20, ca. 2 mm long, ca. 0.4 mm wide, sparsely pubescent, free; stigma 0.5 mm long, 0.5 mm wide, pubescent. Fruiting pedicel 10-12 mm long, 2-5 mm in diameter, pubescent to glabrous. Monocarps 5 to 20, 25-40 mm long, 9-20 mm wide, length:width ratio 1.9-2.9, cylindrical, oblong, straight, truncate or rounded at apex, pubescent to glabrate, pale greyish green to red; sessile to shortly stipitate, stipe 0-5 mm long, 3-5 mm wide, pubescent to glabrous. Seeds 9-14 per monocarp, biseriate, 13 to 15 mm long, ca. 11 mm wide, semicircular.   Figure 13.  Uvariodendron citriodorum(Le Thomas) Dagallier & Couvreur Aentire specimen sheet with branch, leaves and flower buds Bflower bud showing bracts, semi-side view Cfruit with monocarps, some monocarps transversally cut, top view Dfruit with monocarps, some monocarps transversally cut, side view. A, B Halle525 (type) C, DSosef 2219. Photos Leo-PaulDagallier.  Distribution. Endemic to Lower Guinean Domain of the Guineo-Congolian Region. Known from one area in Gabon: Belinga, mines de fer, and one locality in Republic of the Congo: Les Saras.  Habitat and ecology. Mature rain forests on rocky soils. Altitude: 800-950 m a.s.l.  Phenology. Fruits collected in July and November.  Vernacular names. Gabon: 'Bombamba'in Bakota ( Halle2896).  Etymology. The specific epithet refers to the strong lemon smell of the plant. The epithet '  Uvariopsis citrata' would prevail as it is the one given by Le Thomas for the variety. However, this specific epithet is already taken by  Uvariopsis citrataCouvreur & Niangadouma, from the genus  Uvariopsis, which is closely related to  Uvariodendron. Following the recommendation 23.A.3.h from Turland et al. (2018)("Avoid [the specific epithets] that have been used before in any closely allied genus"), we choose the specific epithet '  Uvariodendron citriodorum'.   Figure 14.Distribution map of  Uvariodendron citriodorum. Shades of grey represent elevation, from white (sea level) to darker grey (higher elevation). The inset shows the extent of the map over Africa.  Notes. This species differs from the other species, and particularly from  Ud. molundense, in having leaves emitting a strong lemon scent when fresh material is crushed. Apart from this character, this species is morphologically very similar to  Ud. molundense. However, as  Ud. citriodorumand  Ud. molundenseare not monophyletic (Fig. 1, Suppl. materials 1, 2), they can'tbe considered the same species following the phylogenetic species concept.  Preliminary conservation status. This species is only known from one locality in Gabon and one locality in the Republic of the Congo. The EOO of the species is estimated at 2,256 km2 and its AOO at 20 km2. The unique occurrence in the Republic of the Congo dates back more than 30 years and the occurrences in Gabon are situated in Belinga. Although the project of exploitation of the Belingairon ore deposits has been canceled, this locality is still threatened by a possible future exploitation of the ore. Following IUCN criterion B, it is thus assigned a preliminary conservation status of Endangered EN B1a(i,ii,iii,iv)+2a(i,ii,iii,iv).  Additional specimens examined.   Gabon-  Ogooue-Ivindo• M.S.M. Sosef2219 (BR, K, LBV, MO, WAG), Belinga, Mines de Fer, 4 kmon the road to Mvadi; 1°05'N, 13°12'E; alt.  900 m; 05 Nov. 2005• N. Halle2896 (P), Belinga; 1°05'N, 13°08'E; alt. 900 m; 29 Oct. 1964• N. Halle3082 (P), Belinga; 1°05'N, 13°08'E; alt. 950 m; 07 Nov. 1964• N. Halle13 (P), Belinga, mines de fer, route du Belvedere; 1°05'N, 13°12'E; alt. 950 m; 08 Jul. 1966• N. Halle(P), Belinga, mines de fer, route du pt. B3; 1°06'N, 13°12'E; 25 Jul. 1966• N. Halle(K, MO, P), Belinga, mines de fer; 1°08'N, 13°12'E; alt. 950 m; 16 Jul. 1966.  Republic of the Congo- Kouilou • H. de Foresta1759 (P), Les Saras, piste Cofibois, environs de la plantation Coobama de 1987; 4°22'S, 12°22'E; 25 Nov. 1988. 2005-11-05 M. S. M. Sosef Gabon 900 1.0833334 Mines de Fer 1308 13.2 1 Ogooue-Ivindo 1988-11-25 H. de Foresta Republic of the Congo -4.366667 Republic of the Congo 1306 12.366667 1