Monotes hypoleucus var. loandensis (Exell) Meerts, 2017
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publication ID |
https://doi.org/ 10.11646/phytotaxa.308.2.1 |
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persistent identifier |
https://treatment.plazi.org/id/03A1879D-637A-FFE7-FF13-FBE4F8274423 |
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treatment provided by |
Felipe |
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scientific name |
Monotes hypoleucus var. loandensis (Exell) Meerts |
| status |
comb. et stat. nov. |
9e. Monotes hypoleucus var. loandensis (Exell) Meerts View in CoL , comb. et stat. nov.
Basionym: Monotes loandensis Exell (1932: 220) View in CoL ; Bancroft (1937: 137; 1939a: 353); Catarino et al. (2013: 270); Duvigneaud (1949: 50); Figueiredo & Smith (2008: 67); Lebrun & Stork (1991: 144).
Type: — ANGOLA. Malange , Quirima, 23 January 1931, Gossweiler 9492 (holo-: BM! [barcode BM000603380]; iso-: COI!, K! [barcode K000240344], LISC! [barcode LISC019576]) .
= Monotes loandensis var. griseotomentosus Duvigneaud (1949: 51 View in CoL & Pl. 12 e–h). Type :—D.R CONGO. Kwango, 42 km SW Kenge, forêt claire à Uapaca View in CoL , 9 May 1948, Duvigneaud 856M (holo-: BRLU! [barcode BRLU0000090022319]; iso-: BRLU! (6 sheets)), syn. nov.
Diagnosis:— Differs from the type variety in the following traits: leaf blade smaller, more or less spathulate, lower surface of leaf with secondary nerves glabrous, reddish chestnut, basal gland narrowly elliptic.
Branchlets quickly glabrous, grey. Leaf: petiole 7–13 mm long, ca. 2 mm in diameter, blade obovate-spathulate to elliptic, 5–8 × 2–4 cm, generally at least 2.5 times longer than wide, base cuneate, apex rounded to emarginate, with 8–13 pairs of nerves; basal gland shiny, narrowly elliptic, 2–5 times longer than wide; upper surface of leaf generally reticulate, often granular (yellow sessile glands), generally glabrous, occasionally with minuscule hairs, glabrescent; lower surface discolorous, whitish to ash-greyish, with cottony indumentum covering areoles; secondary nerves and costa prominent, almost glabrous, red to chestnut coloured, contrasting with the grey-whitish indumentum; tertiary nerves generally forming a striking scalariform pattern. Flowers unknown. Fruit 8–10 mm, globose with an apicule, wings large, 3–5 × 1–2 cm.
Illustrations: — Figs. 3P View FIGURE 3 , 4O View FIGURE 4 .
Distribution in D.R. Congo: — Kwango; Upper Katanga.
Distribution elsewhere: — Angola; known only from a few collections.
Habitat and ecology: —Mixed dry semi-evergreen forests (“Mabwati”); wooded savannahs.
Other representative specimens examined:—D.R. CONGO. Kasaï (Kwango): 42 km SW Kenge, forêt claire à Uapaca , 9 May 1948, Duvigneaud 856M. Upper Katanga: Kambove-Kamoia, 1957, Duvigneaud 3352–3353 (BRLU!)).
Discussion:— We have maintained this taxon after much hesitation. All the supposed diagnostic traits can actually be found in var. caloneurus and in var. angolensis and their combination in some specimens is probably fortuitous. In agreement with this hypothesis, the single collection from Katanga perfectly matches the type in leaf size and shape, but departs from it in having a pubescent upper surface of the leaf. Catarino et al. (2013) indicate that “...the species is known from three collections and three different localities. Two of these locations were surveyed several times after the species description, but no further collections are known”. This, in our opinion, is another indication that this taxon represents individual variation of little taxonomic value. Intermediates with var. angolensis occur, e.g. Duvigneaud & Timperman 2402 (BRLU!), Desenfans 5919 (BRLU!), Plancke 121/1584 (BRLU!).
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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Monotes hypoleucus var. loandensis (Exell) Meerts
| Meerts, Pierre, Rougelot, Quentin & Sosef, Marc 2017 |
Monotes loandensis var. griseotomentosus
| Duvigneaud, P. 1949: 51 |