Revision of the family <I>Dipterocarpaceae</I> in Angola

Abstract

The diversity of Dipterocarpaceae in Angola is updated to 24 taxa, two species of Marquesia and 22 species and subspecies of Monotes. A new species is described and four new records (three species and one subspecies) are added to the Flora of Angola. The new species, Monotes paivae, occurs in the province of Bié, central Angola. Its diagnostic characters are a persistent indumentum on the entire upper surface of leaves and a woollytomentose indumentum in the lower surface of adult leaves. A key to the species and the respective descriptions is presented. The species of Monotes endemic in the country are mapped and their conservation status is discussed.Resumo A diversidade da família Dipterocarpaceae em Angola é actualizada para 24 taxa, duas espécies de Marquesia e 22 espécies e subespécies de Monotes. Uma nova espécie é descrita e quatro novos registos (três espécies e uma subespécie) são adicionados à flora de Angola. A nova espécie Monotes paivae, ocorre na províncias do Bié, no centro do país. É caracterizada por possuir indumento persistente em toda a página superior das folhas e um indumento lanoso-tomentoso na página inferior das folhas adultas. Apresenta-se uma chave das espécies e a respectiva descrição. As espécies de Monotes endémicas em Angola são cartografadas e o seu estatuto de conservação discutido.

Sixty-seven species newly recorded for the flora of Angola: recent findings from vegetation surveys and herbarium collections

“…The checklist of Figueiredo and Smith (2008) was used as the baseline for assessing Angolan species records. Species missing there but subsequently reported in later publications (Swanepoel 2009;Bergh and Nordenstam 2010;De Sousa et al 2010;Catarino et al 2013;Abreu et al 2014;Hind and Goyder 2014;Paton 2014;Cheek et al 2015;Darbyshire 2015;Abrahamczyk et al 2016;Darbyshire et al 2018;Harris and Wortley 2018a, 2018b, 2018cDarbyshire and Goyder 2019;Swanepoel 2019;Tripp and Darbyshire 2020;Lautenschläger et al 2020b;Darbyshire et al 2021;Smith and Lautenschläger 2021;Swanepoel et al 2021, Figueiredo andSmith 2022) were excluded.…”

Gondwanan origin of the Dipterocarpaceae-Cistaceae-Bixaceae is supported by fossils, areocladograms, ecomorphological traits and tectonic-plate dynamics

“…org/ and http://www.worldfloraonline.org/ and spot-checked against other geographically restricted web sources. Extra taxonomic and distribution details were obtained from Londoño et al (1995), Lemmens (2011) and Catarino et al (2013). The tectonic plate associated with each species location was identified from the supplementary animation by Young et al (2019; https://ars.els-cdn.com/content/image/1-s2.0-S1674987118301373-mmc1.mp4).…”

Revision of the genus Monotes (Dipterocarpaceae) in D.R. Congo, with implications for Angola and its distinction from Marquesia

“…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) Tree up to 13-14 m high; branchlets tomentellous. Leaf: petiole 10-20 mm long, 2.5-3 mm in diameter; blade elliptic to oblong or obovate-oblong, 6-12(-14) × 2.7-7(-9) cm, rounded to slightly cordate at the base, obtuse to slightly emarginate and sometimes acute or apiculate at the apex; lateral nerves in 10-15 pairs, nearly straight, some of them furcate near the apex, nerves and bifurcations reaching the margin of the leaf; upper surface minutely tuberculatesubreticulate, scaberulous with straight or nearly straight simple hairs 0.2-0.5(-0.6) mm long, developed on minute, white tubercles, glabrescent, becoming yellowish brown to livid with age; lower surface beige to pale fulvous-pubescent with straight or curled hairs on the nerves, veins and reticulation, and with interreticular areoles covered with minute stellate hairs; midrib very thick and prominent beneath, with fasciculate hairs; reticulation very prominent below and forming deep cavities (depth ≥ 2 mm).…”

“…A more synthetic treatment, with only two varieties is much more realistic. Due to the virtually continuous pattern of variation, and considering that those taxa are apparently sympatric over most of their fairly large distribution range, the rank of variety seems more appropriate than the rank of subspecies adopted by and later authors Catarino et al 2013). …”

“…For the type subspecies, in addition to the type specimen, Catarino et al (2013) cite three collections from Angola. However, all of these depart from the type in many respects and probably do not belong here.…”