Monotes dasyanthus Gilg var. mutetetwa (P.A.Duvign.) Meerts, 2017

Meerts, Pierre, Rougelot, Quentin & Sosef, Marc, 2017, Revision of the genus Monotes (Dipterocarpaceae) in D. R. Congo, with implications for Angola and its distinction from Marquesia, Phytotaxa 308 (2), pp. 151-205 : 175-176

publication ID	https://doi.org/ 10.11646/phytotaxa.308.2.1
persistent identifier	https://treatment.plazi.org/id/03A1879D-6344-FFD9-FF13-F860FFDF40CF
treatment provided by	Felipe
scientific name	Monotes dasyanthus Gilg var. mutetetwa (P.A.Duvign.) Meerts
status	comb. et stat. nov.

Treatment

4c. Monotes dasyanthus Gilg var. mutetetwa (P.A.Duvign.) Meerts View in CoL , comb. et stat. nov.

Basionym: Monotes mutetetwa Duvigneaud (1949: 58 View in CoL , Pl. 14a, b, excl. forma sericea , excl. Duvigneaud 971); Mullenders (1954: 375, map).

Lectotype (designated here): —D.R. CONGO. Muniungu , forêt claire à Uapaca-Daniellia, sable noir en surface, 6 May 1948, Duvigneaud 840M2 (lecto-: BRLU! barcode [BRLU0000090022043], isolecto-: BRLU! (5 sheets)).

Diagnosis: — Differs from the type variety essentially in having a concolorous leaf blade with areoles on the lower surface glabrous or very sparsely pubescent, and the hairs on the reticulum not masking the areoles.

Leaf blade ovate to elliptic or oblong, 8–18 × 4.5–14 cm, dark green to bronze, base slightly cordate or rounded, apex rounded to acute or acuminate, with up to 19 pairs of nerves; upper surface pubescent, scaberulous, harsh to the touch, hairs straight, stiff or nearly so, clearly separated from one another, 0.3–1 mm long, on cushion-like emergences; lower surface concolorous to slightly discolorous, areoles glabrous or with sparse stellate hairs, with yellow glands, nerves and reticulum hirsute, with pale fulvous to whitish, straight to flexuous, not woolly, 1–2 mm long hairs, areoles forming cavities. Flowers in dense axillary racemiform cymes ca. 4 cm long. Fruits apparently as in var. dasyanthus , occasionally with a pointed tip.

Illustrations: — Figs 3G View FIGURE 3 , 4G View FIGURE 4 , 9D View FIGURE 9 .

Distribution in D.R. Congo: — Bas-Congo, Kwango.

Distribution elsewhere: — Angola? (many (all?) specimens assigned to “ M. mutetetwa ” in Angola ( Catarino et al. 2013) probably belong in M. dasyanthus var. dasyanthus ).

Habitat and ecology: —“Tumbi” and “Mabwati” (mixed, semi-evergreen dry forests) with Uapaca nitida and Berlinia giorgii ( Mullenders 1954; Devred 1957); miombo woodland (ecology poorly known due to confusion with var. dasyanthus ).

Other representative specimens examined:—D.R. CONGO. Bas-Congo: région de Kimvula-Pandi, s.d., Duvigneaud s.n. ( BRLU!). Kasaï (Kwango): Kika Kiala, matumbi, 3 February 1952, Callens 3034 ( BM!, BR!) ; Région de Mawanga, savane boisée, 30 April 1953, Callens 4061 (BR!, KISA) ; Route Feshi-Tono, forêt claire dégradée, 18 March 1956, Devred 2978 ( BR!) ; steppe entre Gungu et Kahemba (130 km S de Gungu), April 1948, Duvigneaud 945M ( BRLU!) ; 5 km N de Kahemba, forêt claire à Brachystegia-Julbernardia, 30 May 1948, Duvigneaud 950M ( BRLU!) ; Kahemba, route vers l’Angola, galerie forestière, 31 May 1948, Duvigneaud 954M (BRLU!, syntype) ; Entre Kwango-Wamba, village Monkondo, savane arbustive, 30 July 1944, Germain 2522 (BR!, BRLU (fragm.)!, KISA, L!) .

Vernacular names: —Bokombolo tseke (Kiyaka), mukeletete (Kitchok); mutetetwa, ntetetwa (Kitchok).

Discussion:— Duvigneaud described M. mutetetwa to accomodate forms of M. dasyanthus with the reticulum and areoles not hidden by the fulvous indumentum and with leaves larger than the type. However, within M. dasyanthus , there is considerable variation in thickness and density of the lower surface indumentum, without a clear relation to leaf size. We here propose to divide M. dasyanthus following the same criterion as used to divide M. adenophyllus , i.e. presence/absence of stellate hairs in areoles. We thus restrict M. mutetetwa to the concolorous forms in which the stellate indumentum is sparse to lacking, downgrading it to varietal rank within M. dasyanthus .

Duvigneaud (1949) cites two syntypes, one in flower (Duvigneaud 840M2) and one in fruit (Duvigneaud 954M); the flowering specimen is here chosen as the lectotype.

Considering leaf shape and indumentum, M. dasyanthus var. mutetetwa , as already noted by Duvigneaud (1949), comes close to M. glandulosus Pierre , a poorly known taxon (see note at the end of this article). However, the latter has the anther with a conspicuous appendage, while the former has the anther with the appendage inconspicuous.

Intermediates with M. caloneurus exist (Duvigneaud 2364 (BRLU!)).