Revision of the genus Monotes (Dipterocarpaceae) in D. R. Congo, with implications for Angola and its distinction from Marquesia Author Meerts, Pierre Herbarium et bibliothèque de botanique africaine, Université Libre de Bruxelles, Avenue F. D. Roosevelt 50, CP 244, B- 1050 Brussels, Belgium Author Rougelot, Quentin Herbarium et bibliothèque de botanique africaine, Université Libre de Bruxelles, Avenue F. D. Roosevelt 50, CP 244, B- 1050 Brussels, Belgium Author Sosef, Marc Botanic Garden Meise, Nieuwelaan 38, B- 1860 Meise, Belgium text Phytotaxa 2017 2017-06-07 308 2 151 205 http://dx.doi.org/10.11646/phytotaxa.308.2.1 journal article 10.11646/phytotaxa.308.2.1 1179-3163 13701270 5. Monotes doryphorus Duvigneaud (1958: 233) Type : —D.R. CONGO . Haut-Katanga, Mutshatsha, forêt claire à Pseudoberlinia paniculata sur roches kibariennes dominant la rivière Lubudi, August 1956 , Duvigneaud & Timperman 2530Ml ( holo- : BRLU! [barcode BRLU0000090020797], iso- : BRLU! (6 sheets, excl. BRLU0000090020773)). ≡ “ Monotes cuspidatus P.A.Duvign. ” in schedis, unpublished designation. Tree up to 12 m high; branches glabrous to sparsely puberulent, glabrescent, longitudinally ridged, lenticellate; old twigs pale-coloured, more or less smooth; apical bud with ciliate appressed-pubescent scales. Leaf: petiole (7–)12– 21(–25) mm long, slender (the most slender in the genus), less than 1 mm thick, often slightly dilated in upper part, glabrous or with scattered minute fasciculate hairs; blade narrowly ovate-lanceolate (3–)4–10(–13) × (0.7–)1.5–3.6(– 4.0) cm, l/w ratio 3–5, base cuneate to rounded or rarely slightly cordate in the broadest leaves, apex acute to long acuminate, with 10–17 pairs of secondary nerves, generally markedly curved, anastomosing at short distance from the margin; upper surface reticulate and generally shiny (varnished), with reticulum often orange-lepidote, glabrous or, more rarely, with scattered small fasciculate hairs; nerves prominent on lower surface, glabrous or sparsely puberulous with fasciculate hairs; margin slightly recurved, with minute fasciculate hairs or, more rarely, glabrous; basal gland reddish, elongate, 1–2 × 0.7 mm . Inflorescence of small axillary cymes, rarely grouped to form a short panicle, lax, few-flowered, peduncle 1–3 cm long, rachis minutely pubescent. Flower buds appressed pubescent, obconical, 2–3 mm long, pedicels ca. 1 mm long; bracts reddish, ciliate, 2–3 × 1.5 mm ; stamens fused at base in a very short ring. Fruit: pedicel 3–4 mm long, minutely pubescent; achene globose, with conical beak, ca. 6–7 × 5–6 mm , with prominent veins in herbarium (or shrinking on drying?), more or less covered with fascicles of straight simple hairs; wings 1.0– 3.0 × 0.6–0.9 cm , oblanceolate, oblong, lanceolate, rounded at apex, slightly unguiculate, minutely pubescent, with raised reticulum, yellowish brown. Illustrations: — Figs. 3H , 4H , 8B , 14 . Distribution in D.R. Congo : —Western Upper Katanga , “sous-district de la Haute-Lubudi” and “district of the NW foothills of the Manika” ( Duvigneaud 1958 ). Endemic of D.R. Congo ( Fig. 16D ). Habitat and ecology: —Miombo forests, wooded savannahs, bushy savannahs, chypia, degraded forest, on various kinds of soil, often on rocky slopes on kibarian shale. Flowering in February; fruiting in June. Vernacular names: —Mudianshi, ngowa (Kiluba). Other representative specimens examined:—D.R. CONGO . Upper Katanga : Relevé 168 au S du point Sunswe, pente N 40%, forêt claire, 30 January 1954 , Desenfans 5019 (BRLU!); Mukulakulu, forêt claire, 29 April 1953 , De Troyer 73 (BR!); Mutshasha, forêt à Pseudoberlinia sur colline schisteuse, September 1956 , Duvigneaud & Timperman 2530M (BRLU!); 46 km E de Mutshasha, forêt claire à Mikondo sur sol ocre des plateaux avec nombreuses pierres, 24 August 1956 , Duvigneaud & Timperman 2533 (BRLU!); Saluseke (Kasaji), Brousse dégradée, Duvigneau d 3290Di (BRLU!); Entre Nzilo et Delcommune, verger à Monotes doryphorus , riche en Protea hirtii , sur pente de roches kibariennes, 14 December 1959 , Duvigneaud 4558Mi (BRLU!); Delcommune, verger à Monotes div. sp. sur pente rocheuse de roches kibariennes, 14 December 1959 , Duvigneaud 4570Mi (BRLU!); Mpala, forêt chypia à Marquesia et Brachystegia floribunda , 23 January 1960 , Duvigneaud 5221M (BRLU!); Entre Lupusa et Kasekelesa, forêt claire de plaine à Brachystegia spiciformis , 23 January 1960 , Duvigneaud 5227 (BRLU!); Kasekelesa, chantier 1, forêt claire mélangée sur sol manganifère, 25 January 1960 , Duvigneaud 5239MI (BRLU!); Nzilo, forêt verger à Monotes div. sp. enrochée, sur phyllades kibariennes, 27 January 1960 , Duvigneaud 5268Mi (BRLU!); Nzilo, forêt de pente, 27 January 1960 , Duvigneaud 5269M (BRLU!); Plateau des Kibara, ancienne piste Delmar, km 13, forêt claire à nombreux Monotes , 21 September 1958 , Plancke 113/1667 (BRLU!), Ancienne piste Delmar, km 31, Plaine de la Mabuya, 21 September 1958 , Plancke 118/1722 (BRLU!); 10 km de Kanzenze, sur la route de Busanga ( 40 km NW Kolwezi), forêt claire sur sol sablonneux, May 1952 , Schmitz 3984 (BR!); Upemba, 26 June 1956 , Vanden Brande K65 (BR!); Discussion:— This species is strongly reminiscent of Marquesia in having ovate, long acuminate leaves and slender, furrowed twigs. Some specimens are intermediate with Monotes duvigneaudii var. concolor ; the relationship between the latter and Monotes doryphorus needs further investigation. References:— Lebrun & Stork (1991: 144) ; Meerts (2016: 223).