Monotes duvigneaudii Meerts var. duvigneaudii

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 : 179

6a. Monotes duvigneaudii Meerts var. duvigneaudii

Diagnosis:— Lower surface of leaf strongly discolorous, white or whitish to pale greyish, with a continuous layer of very short stellate hairs entirely covering areoles and reticulum, sparser on the secondary nerves.

Illustrations: — Figs. 3I , 5L , 11 .

Distribution in D.R. Congo: —Upper Katanga. Endemic of D.R. Congo ( Fig. 16A ).

Habitat and ecology: —Miombo woodland.

Additional specimens examined:—D.R. CONGO. Upper Katanga: Delcommune , verger à Monotes div. sp. sur pente rocheuse de phyllades kibariennes, 14 December 1959, Duvigneaud 4570M3 ( BRLU!) ; sine dato, sine loco, Vanden Brande MitV221 ( BRLU!) .

Discussion:— A striking taxon strongly reminiscent of Marquesia , with ovate-acuminate leaves, slender twigs, and glabrous upper surface of the blade.

Figures

FIGURE 3 A–H. Details of lower surface of the leaf.A. Monotes adenophyllus var. adenophyllus (Duvigneaud 5112). B. M. adenophyllus var.homblei (Duvigneaud 4601). C. M.africanus (Duvigneaud 2006). D.M.autennei (Duvigneaud 5260). E.M.dasyanthus var.dasyanthus (Duvigneaud & Timperman 2341). F. M.dasyanthus var. heterotrichus (Duvigneaud 1141). G. M. dasyanthus var. mutetetwa (Duvigneaud 950). H. M. doryphorus (Duvigneaud 5267).

FIGURE 5 A–H. SEM photographs of leaf blade surfaces for 12 members of Monotes. A. M. adenophyllus var. adenophyllus, lower surface (Delevoy 524, type of M. delevoyi). B. M. autennei, lower surface (Duvigneaud 3267 (type of M. autennei)). C. M. autennei, upper surface (Duvigneaud 3267). D. M. hypoleucus var. angolensis, lower surface (Duvigneaud 950M2, type of M. oxyphyllinus). E. M. hypoleucus var. angolensis, upper surface (Duvigneaud 950M2). F.M. hypoleucus var. caloneurus, lower surface (Schmitz 1332 (type of M. schmitzii)). G. M. hypoleucus var. caloneurus, upper surface (Schmitz 1332 (type of M. schmitzii)). H. M. hypoleucus var. hypoleucus, lower surface (Welwitsch 1036 (type of M. hypoleucus)).

FIGURE 11. Monotes duvigneaudii var. duvigneaudii. A. Habit: flowering branch (× 1½). B. Leaf base with gland (× 16). C. Detail: upper surface of leaf (× 55). D. Detail: leaf margin (× 95). E. Detail: leaf lower surface with seconday vein (× 95). F. Flower bud (× 10). G. Flower (× 11). H. Anther (× 65). I. Flower, opened, two stamens removed (× 11). J. Stamen (× 11). K. Ovary (× 11). (A–D, F–K: Duvigneaud 5268M4; E: Duvigneaud 4570M3). Drawing by Hans de Vries, Botanical Garden Meise (©).

FIGURE 16. Distribution maps.A.Monotes duvigneaudii var.duvigneaudii: Θ; var.concolor:z; B. M.rubriglans subsp.upembensis var. griseocoriaceus: ·; C. M. rubriglans subsp. upembensis var.upembensis:; D. M. doryphorus: „; E. M.magnificus var. gigantophyllus: z; M. hirtii: ·; F. M. dasyanthus var. heterotrichus:.