Plant Ecology and Evolution 153(3): 427-445, doi: 10.5091/plecevo.2020.1727
Further new species and records from the coastal dry forests and woodlands of the Rovuma Centre of Endemism
expand article infoIain Darbyshire, David J. Goyder§, John R.I. Wood|, Aurélio Banze, John E. Burrows#
‡ Royal Botanic Gardens, Kew, Kew, Richmond, United Kingdom§ Kew Herbarium, London, United Kingdom| Oxford University, Oxford, United Kingdom¶ Instituto de Investigação Agrária de Moçambique (IIAM), P.O. Box 3658, Mavalane, Maputo, Mozambique# Buffelskloof Nature Reserve and Herbarium, Lydenburg, South Africa
Open Access

Background and aims – The coastal dry forests and woodlands of Cabo Delgado Province (Mozambique), part of the proposed Rovuma Centre of Endemism that is shared with coastal southern Tanzania, are known to support high numbers of endemic and highly range-restricted species. Here we investigate the taxonomic status of three taxa that were discovered and highlighted as potential novelties during botanical surveys of northeast Cabo Delgado in 2003–2012.

Methods – This study was based on standard practices of herbarium taxonomy and morphological analyses. The conservation (extinction risk) assessments are based on application of the Categories and Criteria of the IUCN Red List.

Key results – Three new species are described, all of which are currently thought to be endemic to Cabo Delgado Province and recorded from the area around the coastal town of Palma and/or inland along the lower Rovuma River Escarpment. Casearia celastroides I.Darbysh. & J.E.Burrows (Salicaceae), the smallest African member of its genus, is assessed as globally Endangered. Convolvulus goyderi J.R.I.Wood (Convolvulaceae), which, in contrast, has the largest flowers in its genus in tropical Africa, is known only from the type collection and is assessed as Data Deficient (DD) but could potentially be threatened. Vitex franceseana I.Darbysh. & Goyder (Lamiaceae) is also assessed as globally Endangered. Crossopetalum mossambicense I.Darbysh., a species previously thought to be endemic to Cabo Delgado, is reported for the first time in neighbouring southeast Tanzania. A review of new species discoveries from Mozambique since 2010 reveals that 26 species (one third of the newly published species) are derived from the forests and woodlands of the Rovuma Centre of Endemism, which is a critical area for plant conservation in Mozambique.

Cabo Delgado, coastal dry forest, endemic, IUCN Red List, Mozambique, Rovuma, Tanzania, taxonomy


  • Bachman S., Moat J., Hill A.W., de la Torre J., Scott B. (2011) Supporting red list threat assessments with GeoCAT: Geospatial conservation assessment tool. Zookeys 150: 117–126.
  • Breteler F.J. (2008) A synopsis of Casearia Jacq. (Samydeae-Salicaceae) in West and Central Africa with a description of a new species from Eastern Congo (Kinshasa). Kew Bulletin 63: 101–112.
  • Bridson D.M. (1998) Rubiaceae (part 2). In: Pope G.V. (ed.) Flora Zambesiaca vol. 5(2): 211–377. Kew, Royal Botanic Gardens.
  • Bridson D.M., Verdcourt B. (2003) Rubiaceae (part 3). In: Pope G.V. (ed.) Flora Zambesiaca vol. 5(3): 379–720. Kew, Royal Botanic Gardens.
  • Burgess N.D., Clarke G.P. (2000) Coastal Forests of Eastern Africa. Gland, Switzerland and Cambridge, England, IUCN Forest Conservation Programme.
  • Burrows J.E., Burrows S.M. (2009) Notes on African plants. Mimosaceae. A new species of Acacia from northern Mozambique. Bothalia 39(2): 222–225.
  • Burrows J.E., Burrows S.M. (2010) Notes on African plants. Rubiaceae. A new species of Didymosalpinx and a new species of Oxyanthus from Mozambique and Tanzania. Bothalia 40(2): 201–204.
  • Burrows J.E., Timberlake J.R. (2011) Mozambique’s centres of endemism, with special reference to the Rovuma Centre of Endemism of NE Mozambique and SE Tanzania. In: Conference Abstracts: South African Association of Botanists – Annual Meeting 2011. Abstracts of papers and posters presented at the 37th Annual Congress of the South African Association of Botanists held at Rhodes University, Grahamstown, 17–19 January 2011. South African Journal of Botany 77: 518.
  • Burrows J.E., Burrows S., Lötter M., Schmidt E. (2018a) Trees and Shrubs [of] Mozambique. Noordhoek, Cape Town, Publishing Print Matters.
  • Burrows J.E., Raimondo D., Timberlake J., Luke W.R.Q., Matimele H.A., Alves M.T., Massingue A.O., Coates Palgrave F.M., Hyde M.A., Hadj-Hammou J., Osborne J. (2018b) Chassalia colorata (amended version of 2014 assessment). The IUCN Red List of Threatened Species 2018: e.T179473A136716986.
  • Byng J.W., Burrows J.E. (2018) Syzygium niassense. In: Christenhusz M.J.M., Fay M.F., Byng J.W. (eds) The Global Flora. A practical flora to vascular plant species of the world. Special edition, GLOVAP nomenclature part 1, vol. 4: 129–132.
  • Clarke G.P. (1998) A new regional centre of endemism in Africa. In: Huxley C.R., Lock J.M., Cutler D.F. (eds) Chorology, taxonomy and ecology of the floras of Africa and Madagascar: 53–65. Kew, Royal Botanic Gardens.
  • Clarke G.P. (2001) The Lindi local centre of endemism in SE Tanzania. Systematics and Geography of Plants 71(2): 1063–1072.
  • Conservation International (2005) Biodiversity Hotspots: Coastal Forests of Eastern Africa. Available at [accessed 6 Feb. 2020].
  • Darbyshire I., Simmons M.P., Cappa J.J., Breteler F.J., Buerki S. (2016) Pleurostylia serrulata and two allied new species from Africa are actually members of the New World Crossopetalum (Celastraceae). Systematic Botany 41(4): 851–864.
  • Darbyshire I., Timberlake J., Osborne J., Rokni S., Matimele H., Langa C., Datizua C., de Sousa C., Alves T., Massingue A., Hadj-Hammou J., Dhanda S., Shah T., Wursten B. (2019a) The endemic plants of Mozambique: diversity and conservation status. Phytokeys 136: 45–96.
  • Darbyshire I., Burrows J.E., Alves M.T., Chelene I., Datizua C., de Sousa C., Fijamo V., Langa C., Massingue A.O., Massunde J., Matimele H.A., Mucaleque P.A., Osborne J., Rokni S., Sitoe P. (2019b) Vepris allenii. The IUCN Red List of Threatened Species 2019: e.T32167A62490444.
  • Darbyshire I., Langa C., Romeiras M.M. (2019c) A synopsis of Polysphaeria (Rubiaceae) in Mozambique, including two new species. Phytotaxa 414(1): 1–18. Available at [accessed 11 Aug. 2020].
  • Degreef J. (2006) Revision of continental African Tarenna (Rubiaceae-Pavetteae). Opera Botanica Belgica 14: 1–150. Meise, National Botanic Garden of Belgium.
  • Gonçalves M.L. (1987) Convolvulaceae-Cuscutaceae. In: Launert E. (ed.) Flora Zambesiaca vol. 8(1): 1–129. London, Flora Zambesiaca Managing Committee.
  • Gonçalves M.L. (1992) Convolvulaceae. Flora de Moçambique 113: 1–134. Lisbon, Instituto de Investigação Científica Tropical.
  • Goyder D.J. (2004) An amplified concept of Philibertia Kunth (Apocynaceae: Asclepiedoideae), with a synopsis of the genus. Kew Bulletin 59(3): 415–451.
  • Haigh A., Boyce P.C. (2012) Araceae. In: Timberlake J.R., Martins E.S. (eds) Flora Zambesiaca vol. 12(1): 1–54. Kew, Royal Botanic Gardens.
  • Hyde M.A., Wursten B.T., Ballings P., Coates Palgrave M. (2020) Flora of Mozambique. Available at [accessed 3 Jul. 2020].
  • IPNI (2020) International Plant Names Index (IPNI). Available at [accessed 27 Feb. 2020].
  • IUCN (2012) IUCN Red List Categories and Criteria. Version 3.1. Second Edition. Gland, Switzerland & Cambridge, United Kingdom, IUCN Species Survival Commission. Available at: [accessed 20 Feb. 2020].
  • IUCN Standards and Petitions Committee (2019) Guidelines for Using the IUCN Red List Categories and Criteria. Version 14. Prepared by the Standards and Petitions Committee. Available at [accessed 20 Apr. 2020].
  • Killick D.J.B. (1976) Flacourtiaceae. In: Ross J.H. (ed.) Flora of Southern Africa vol. 22: 53–92. Pretoria, Botanical Research Institute, Department of Agricultural Technical Services.
  • Miles L., Newton A.C., DeFries R.S., Ravilious C., May I., Blyth S., Kapos V., Gordon J.E. (2006) A global overview of the conservation status of tropical dry forests. Journal of Biogeography 33(3): 491–505.
  • Pieper W. (1928) Vorarbeiten zu einer Revision der afrikanischen Vitex-Arten mit Berüchsichtigung des übrigen. Botanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie 62, Beibl. 141: 1–91.
  • Sales F. (2005) Vitex. In: Pope G.V., Martins E.S. (eds) Flora Zambesiaca vol. 8(7): 73–92. Kew, Royal Botanic Gardens.
  • Shorthouse D.P. (2010) SimpleMappr, an online tool to produce publication-quality point maps. Available at [accessed 6 Feb. 2020].
  • Sleumer H. (1954) Flacourtiaceae. In: van Steenis C.G.G.J. (ed.) Flora Malesiana ser. 1(5): 1–106. Jakarta, Noordhoff-Kolff N.V.
  • Sleumer H. (1971) Le genre Casearia Jacq. (Flacourtiaceae) en Afrique, à Madagascar et aux Mascareignes. Bulletin du Jardin Botanique National de Belgique 41(4): 397–426.
  • Smith T.J. (2005) Important Plant Areas in southern Africa. Combined proceedings of workshops held in Mozambique, Namibia and South Africa. Southern African Botanical Network Report No. 39. Pretoria, SABONET.
  • Stone R.D., Tenza N.P. (2017) Warneckea albiflora, a new species of W. subgenus Carnosae (Melastomataceae–Olisbeoideae) from coastal dry forest in northern Mozambique. Phytotaxa 311(2): 168–174.
  • Stone R.D., Mona I.G., Ramdhani S. (2017) Revised treatment of Mozambican Memecylon (Melastomataceae–Olisbeoideae), with descriptions of four new species in M. section Buxifolia. Phytotaxa 331(2): 151–168.
  • Thiers B. (continuously updated) Index Herbariorum: a global directory of public herbaria and associated staff. New York Botanical Garden’s Virtual Herbarium. Available at [accessed 26 Nov. 2019].
  • Timberlake J., Goyder D., Crawford F., Pascal O. (2010) Coastal dry forests in Cabo Delgado Province, northern Mozambique: Botany and vegetation. Report for ProNatura International. Kew, Royal Botanic Gardens.
  • Timberlake J., Goyder D., Crawford F., Burrows J.E., Clarke G.P., Luke Q., Matimele H., Müller T., Pascal O., Sousa C. de, Alves T. (2011) Coastal dry forests in northern Mozambique. Plant Ecology and Evolution 144(2): 126–137.
  • Verdcourt B. (1992) Verbenaceae. In: Polhill R.M. (ed.) Flora of Tropical East Africa. Rotterdam, A.A. Balkema.
  • White F. (1983) Vegetation of Africa. A descriptive memoir to accompany the UNESCO/ AETFAT/UNSO vegetation map of Africa. Paris, UNESCO.
  • Wild H. (1960) Flacourtiaceae (including Samydaceae). In: Exell A.W., Wild H. (eds) Flora Zambesiaca vol. 1(1): 261–298. London, Crown Agents for Oversea Governments and Administrations.
  • Wild H., Vidigal M.P. (1973) Flacourtiaceae. In: Fernandes A. (ed.) Flora de Moçambique 16: 1–39. Junta da Investigações do Ultramar, Centro Botânica, Lisbon.
  • Wood J.R.I., Williams B.R.M., Mitchell T.C., Carine M.A., Harris D.J., Scotland R.W. (2015) A foundation monograph of Convolvulus L. (Convolvulaceae). PhytoKeys 51 (special issue): 1–282.