Monotes magnificus Gilg (1899: 135)

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 : 191

11. Monotes magnificus Gilg (1899: 135) ; Bancroft (1939a: 377); De Wildeman (1927a: 180); Duvigneaud (1949: 53;

1961: 412); Engler (1921: 520); Gilg (1908b: 290); Lebrun & Stork (1991: 144); Meerts (2016: 223); Verdcourt (1989:

7; 6: Fig. 2 ); White (1962: 263; fig. 46G)

Type: — TANZANIA. Makombe (Prov. Iringa), lande der Uhehe, an trockenen Bergabhängen auf rotem Laterit, February 1898, Götze 680 (B†).

Shrub to small tree up to 8 m. high; branchlets pubescent, becoming glabrous, thick (up to 1 cm). Leaf: petiole 20–35 mm long, 3–4 mm thick; blade suborbicular to broadly ovate, 12–45 × 9–30 cm, cordate at the base, emarginate at the apex; lateral nerves in (9–)10–11(–12) pairs (with a weak tendency to formation of short subsidiaries), slightly depressed above, slightly curving towards the apex, many of them producing 1–3 bifurcations on the side nearest the base of the leaf before reaching the margin, nerves and bifurcations anastomosing on the thickened margin; upper surface finely reticulate, substrigose, with straight single hairs 0.5–1.5 mm long; extra leaf-glands in the axils of the lateral nerves; lower surface discolorous, greyish- or brownish-floccose-tomentose, with relatively long dense curled hairs on the nerves and veins, and with the reticulations and interreticular areoles covered with minute stellate hairs, costa and veins very prominent and conspicuous, tertiary veins often forming a scalariform pattern, reticulation partially hidden by hairs, costa covered with dense straight simple hairs. Inflorescences axillary, few-flowered, subsessile, often condensed in subterminal clusters, densely rufous-tomentose. Flower: pedicel 3–6 mm long; sepals ca. 7 mm long, rufous-sericeous-tomentose; petals 11–12 mm long, rufous-sericeous-tomentose; stamens with anthers produced into a short triangular apiculus. Fruit subspherical, 13–35 mm in diameter, slightly depressed at the apex, brownish, subsericeous-pubescent; wings 4.5–11 × 2·5– 3 cm, yellow or reddish, broadly oblanceolate.

Variation: —This species is vary variable as to size of leaf, fruit and fruit wings; the traits are correlated. Two varieties can be recognized.

Figures

FIGURE 2. Inflorescence architecture in Monotes. A. Axillary cymes (M. adenophyllus, M. africanus, M. doryphorus, M. hypoleucus, M. glaber, M. magnificus, M. pearsonii). B. Short terminal congested panicle (often subtended by a variable number of axillary cymes) (M. dasyanthus, M. duvigneaudii, M. hirtii). C. Long terminal thyrses (M. autennei, M. katangensis). D. Axillary panicle or thyrse born below the leaves (M. rubriglans subsp. upembensis).