Borah, D., M. Taram & M. Hughes (2023). Begonia egamii (Begoniaceae), a remarkable new species from Arunachal Pradesh, India. Candollea 78: 147–151. In English, English abstract. DOI: http://dx.doi.org/10.15553/c2023v782a5

The new species Begonia egamii D. Borah, Taram & M. Hughes (Begoniaceae) is described based on collections made in Leparada District of Arunachal Pradesh, India. It is superficially similar to B. tamdaoensis C.I Peng in having hispid hairs on the tepals and ovary and a zygomorphic androecium, but differs in having leaves rugulose above (vs. smooth), two stigmas (vs. three), and anthers retuse at the apex (vs. with an extended connective).

Received on May 5, 2023. Accepted on October 5, 2023. First published online on November 20, 2023.

Calvo, J. & Á.J. Pérez (2023). On the genus Dendrophorbium in Ecuador: a new species and identification key. Candollea 78: 91–97. In English, English and Spanish abstracts. DOI: http://dx.doi.org/10.15553/c2023v782a1

The new species, Dendrophorbium frezierifolium J. Calvo & Á.J. Pérez, is described from southern Ecuador, where it thrives at the edge of low montane forests near the limit with the paramo ecosystem. It differs from the most similar species D. dodsonii (H. Rob. & Cuatrec.) B. Nord. by its larger, chartaceous leaves with denser indumentum beneath, the stems with arachnoid indumentum, the shorter involucral bracts, and the lower number of disc florets. The species is preliminary assessed as “Endangered” [EN] using the IUCN Red List Categories and Criteria. Furthermore, images of living plants, a distribution map, and the first identification key to the species of Dendrophorbium (Cuatrec.) C. Jeffrey in Ecuador are provided.

Received on February 23, 2023. Accepted on August 16, 2023. First published online on September 13, 2023.

Calvo, J. & Á.J. Pérez (2023). Acerca del género Dendrophorbium (Compositae) en Ecuador: una nueva especie y clave dicotómica. Candollea 78: 91–97. En inglés, resúmenes en inglés y español. DOI: http://dx.doi.org/10.15553/c2023v782a1

La nueva especie, Dendrophorbium frezierifolium J. Calvo & Á.J. Pérez, se describe del sur del Ecuador, donde crece en los márgenes del bosque montano bajo cerca del límite con el ecosistema de páramo. Difiere de D. dodsonii (H. Rob. & Cuatrec.) B. Nord., la especie más similar, por sus hojas más grandes, cartáceas y con mayor indumento en el envés, los tallos con indumento aracnoideo, las brácteas involucrales más cortas y un menor número de flores del disco. De forma preliminar, se asigna la categoría IUCN “En peligro” [EN] a esta especie. Asimismo, se proporcionan imágenes, un mapa de distribución y la primera clave dicotómica para las especies del género Dendrophorbium (Cuatrec.) C. Jeffrey en Ecuador.

Hopkins, H.C.F. & J. Wajer (2023). Variation in the colour and shape of capitula in Parkia bicolor (Leguminosae) illustrated by two watercolours from southern Nigeria painted by Dorothy Amaury Talbot (1871–1916). Candollea 78: 125–138. In English, English abstract. DOI: http://dx.doi.org/10.15553/c2023v782a3

As currently circumscribed, Parkia bicolor A. Chev. (Leguminosae, Caesalpinioideae, mimosoid clade) includes all the African material of this genus in which the red or reddish capitula have a well-developed fringe formed by long staminodial filaments that extend from the basal sterile flowers; the fertile flowers in each capitulum form a large apical ball, which is either spherical or ellipsoidal. Capitula of different shapes and colours in this widely circumscribed species are illustrated in two watercolour paintings at the Natural History Museum (NMH) in London, both labelled “Mr. & Mrs. P. A. Talbot 1912, 1913. Southern Nigeria”. Each painting appears to be a composite based on more than one collection. The Talbots' plant specimens (c. 4,000 numbers) and paintings and sketches (c. 1,000) at the NHM have sometimes been attributed to either Percy Amaury Talbot entirely, or to both Percy and his wife Dorothy together. However, sources including correspondence between the Talbots and botanists at the NHM make clear that Dorothy was responsible for all the artwork and for the majority of their herbarium collections. Descriptions and photographs in addition to Dorothy's artwork suggest that variation in the shape of the capitula is potentially of greater taxonomic significance than differences in colour, but we refrain from drawing any taxonomic conclusions until a comprehensive morphological analysis of P. bicolor has been carried out.

Received on May 13, 2023. Accepted on August 16, 2023. First published online on September 13, 2023.

Jongkind, C.C.H. & M.W. Callmander (2023). Novelties in Combretum (Combretaceae) from Madagascar. Candollea 78: 139–146. In English, English and French abstracts.

The genus Calopyxis Tul. (Combretaceae) from Madagascar was included in Combretum Loefl. as sect. Calopyxis (Tul.) Jongkind in 1995. However, several species names published in Calopyxis and used in the Flore de Madagascar et des Comores are still awaiting for a combination or a synonym link in Combretum. Three names published in Calopyxis are transferred here to Combretum resulting in two new combinations and a replacement name, i.e., C. humbertianum (H. Perrier) Jongkind & Callm., C. malifolium (Bak.) Jongkind & Callm., and C. calopyxis Jongkind & Callm. Calopyxis brevistyla H. Perrier is placed into synonymy of Combretum sphaeroides (Tul.) Jongkind. Lectotypes are also designated here for Calopyxis brevistyla H. Perrier, C. malifolia Baker, C. sphaeroides Tul., and C. velutina Tul. Finally, a new species of Combretum is described from southwestern Madagascar: C. sakoense Jongkind & Callm.

Received on May 18, 2023. Accepted on August 16, 2023. First published online on September 13, 2023.

Jongkind, C.C.H. & M.W. Callmander (2023). Nouveautés dans le genre Combretum (Combretaceae) à Madagascar. Candollea 78: 139–146. En anglais, résumés anglais et français.

Le genre Calopyxis Tul. (Combretaceae) de Madagascar a été inclus dans Combretum Loefl. en tant que sect. Calopyxis (Tul.) Jongkind en 1995. Cependant, plusieurs noms d'espèces publiés dans Calopyxis et utilisés dans la Flore de Madagascar et des Comores sont toujours en attente d'une combinaison ou d'un lien de synonymie dans Combretum. Trois noms publiés dans Calopyxis sont transférés ici dans Combretum, ce qui donne lieu à deux nouvelles combinaisons et un nouveau nom, à savoir C. humbertianum (H. Perrier) Jongkind & Callm., C. malifolium (Bak.) Jongkind & Callm. et C. calopyxis Jongkind & Callm. Calopyxis brevistyla H. Perrier est placée en synonymie de Combretum sphaeroides (Tul.) Jongkind. Des lectotypes sont également désignés ici pour Calopyxis brevistyla H. Perrier, C. malifolia Baker, C. sphaeroides Tul. et C. velutina Tul. Enfin, une nouvelle espèce du sud-ouest de Madagascar est décrite: Combretum sakoense Jongkind & Callm.

Kainulainen, K. (2023). A taxonomic revision of the Malagasy endemic genus Nematostylis (Rubiaceae), with description of two new species. Candollea 78: 177–188. In English, English and french abstracts. DOI: http://dx.doi.org/10.15553/c2023v782a9

Nematostylis Hook. f. (Rubiaceae) is a genus of semi-succulent shrubs endemic to Madagascar, mostly found growing on rocky outcrops in the Northern, Central, and Southern Highlands. This paper provides a revision of the genus in which three species are recognized: N. anthophylla (A. Rich. ex DC.) Baill. and the newly described N. citriflora Kainul. and N. incarnata Kainul. An identification key of the genus is presented, as well as a distribution map, field pictures, line drawings, and species risk of extinction assessments. A neotype is designated for N. anthophylla and a lectotype for N. loranthoides Hook. f.

Received on June 20, 2022. Accepted on October 12, 2023. First published online on November 20, 2023.

Kainulainen, K. (2023). Révision taxonomique du genre Nematostylis (Rubiaceae) endémique de Madagascar, avec la description de deux nouvelles espèces. Candollea 78: 177–188. En anglais, résumés anglais et français. DOI: http://dx.doi.org/10.15553/c2023v782a9

Nematostylis Hook. f. (Rubiaceae) est un genre d'arbustes semi-succulents endémiques de Madagascar, que l'on trouve principalement sur les pitons rocheux des Hautes Terres du nord, du centre et du sud. Cet article présente une révision du genre dans lequel trois espèces sont reconnues: N. anthophylla (A. Rich. ex DC.) Baill. et les espèces nouvellement décrites N. citriflora Kainul. et N. incarnata Kainul. Une clé d'identification du genre est proposée, ainsi qu'une carte de répartition, des photos de terrain, des dessins au trait et des évaluations du risque d'extinction des espèces. Un néotype est désigné pour Nematostylis anthophylla ainsi qu'un lectotype pour N. loranthoides Hook. f.

Low, Y.W., J.F. Wanma, B. Ibrahim, C.D. Heatubun & V.A. Albert (2023). Taxonomic appraisal of Fagraea ceilanica (Gentianaceae), and description of a new tree species from the Bird's Head Peninsula, western New Guinea. Candollea 78: 167–175. In English, English abstract. DOI: http://dx.doi.org/10.15553/c2023v782a8

A new rainforest understorey tree, Fagraea christinae Y.W. Low & V.A. Albert (Gentianaceae), is described here based on three collections from the Bird's Head Peninsula, western New Guinea. The new species was previously included in the species complex F. ceilanica Thunb. s.l. Fagraea christinae is superficially similar to F. annulata Hiern and F. berteroana A. Gray ex Benth. in having stamens inserted upon a fleshy ring on the inner surface of the corolla tube, but differs from those two taxa in having crenate bracteoles and calyx lobes. The new species is provided with line drawings, field photographs and a distribution map.

Received on April 5, 2022. Accepted on October 5, 2023. First published online on November 20, 2023.

Mustaqim, W.A., A. Randi, L.S. Wijedasa, P. Widodo, M. Rivers, E. Lucas & Y.W. Low (2023). Syzygium setosum (Myrtaceae), a rare and endangered peat swamp tree in Southeast Asia: lectotypification, conservation status and a new record in Sumatra. Candollea 78: 153–159. In English, English abstract. DOI: http://dx.doi.org/10.15553/c2023v782a6

Syzygium setosum (King) I.M. Turner (Myrtaceae), a poorly known peat swamp tree endemic to Peninsular Malaysia, is recorded for the first time in Sumatra, Indonesia. This study was conducted based on morphological characters examined on herbarium specimens of the taxon preserved at various herbaria pertinent to the Southeast Asian flora. The description of S. setosum is amended following the new collections from Peninsular Malaysia and Sumatra. The distribution of this obligate peat swamp species is updated and includes the eastern side of Sumatra and the western side of Peninsular Malaysia. The conservation status of the taxon is assessed. With the available data, the taxon is provisionally assigned here as “Endangered” [EN] with the main threat coming from habitat loss. Field images of the taxon from Sumatra are provided. A lectotype is designated here for Eugenia setosa King.

Received on June 28, 2023. Accepted on October 6, 2023. First published online on November 20, 2023.

Pignal, M., C. Laudereau & P.-L. Laudereau (2023). Dendrobium amiceanum (Orchidaceae), a new species of section Macrocladium in New Caledonia. Candollea 78: 239–244. In French, English and French abstracts. DOI: http://dx.doi.org/10.15553/c2023v782a11

Dendrobium amiceanum M. Pignal & Laud. (Orchidaceae) is described from New Caledonia. The new species belongs to section Macrocladium Schltr., in particular to the group of D. pectinatum Finet. This high-altitude species is known only from four localities: Monts Humboldt, Kouakoué, Paéoua, and Grand Boulinda. It differs from D. pectinatum by being twice as large and having pubescent inner base of the petal, 3–5 calli (vs. 3 in D. pectinatum), and the labellum carinae extending to the epichile (vs. not exceeding the mesochile). An updated identification key to the New Caledonian species of the “Dendrobium pectinatum Finet group” is provided.

Received on May 9, 2023. Accepted on October 30, 2023. First published online on November 20, 2023.

Pignal, M., C. Laudereau & P.-L. Laudereau (2023). Dendrobium amiceanum (Orchidaceae), une nouvelle espèce de la section Macrocladium en Nouvelle-Calédonie. Candollea 78: 239–244. En français, résumés anglais et français. DOI: http://dx.doi.org/10.15553/c2023v782a11

Dendrobium amiceanum M. Pignal & Laud. (Orchidaceae) est décrite de la Nouvelle-Calédonie. L'espèce appartient à la section Macrocladium Schltr. et plus particulièrement au groupe D. pectinatum Finet. Cette espèce d'altitude n'est connue que de quatre localités: les Monts Humboldt, Kouakoué, Paéoua et Grand Boulinda. Elle se distingue de D. pectinatum par sa taille deux fois plus grande, la base interne du pétale pubescente, 3–5 callus (vs. 3 chez D. pectinatum) et des carènes du labelle qui se prolongent jusqu'à l'épichile (vs. ne dépassent pas le mésochile). Une clé d'identification des espèces néocalédoniennes du “groupe Dendrobium pectinatum Finet” est proposée.

Stone, R.D. (2023). Twenty-four new species of Memecylon (Melastomataceae) from Madagascar. Candollea 78: 189–237. In English, English and French abstracts. DOI: http://dx.doi.org/10.15553/c2023v782a10

Memecylon L. (Melastomataceae, Olisbeoideae) is a widespread paleotropical genus of forest shrubs and small trees and is one of the ten most species-rich genera of woody plants in Madagascar. All of the Malagasy species are endemic to the island, and most of them are known from just one or two sites. As part of ongoing work toward a comprehensive taxonomic revision, twenty-four new Malagasy species are described and illustrated here: M. albocoronatum R.D. Stone, M. antongilense R.D. Stone, M. articulatum R.D. Stone, M. atractocarpum R.D. Stone, M. betamponense R.D. Stone, M. bullatum R.D. Stone, M. calcicola R.D. Stone, M. dipterum R.D. Stone, M. drymophilum R.D. Stone, M. florosum R.D. Stone, M. fodinae R.D. Stone, M. fusiforme R.D. Stone, M. futilifolium R.D. Stone, M. iantarense R.D. Stone, M. ingens R.D. Stone & D. Turk, M. lemuricum R.D. Stone, M. marojejense R.D. Stone, M. montis-gallicorum R.D. Stone, M. naviculiforme R.D. Stone, M. pseudomocquerysii R.D. Stone, M. pseudopulvinatum R.D. Stone, M. subaridum R.D. Stone, M. subundulatum R.D. Stone, and M. triflorum R.D. Stone. The conservation status of each species is provisionally assessed in accordance with the IUCN Red List Categories and Criteria.

Received on September 4, 2023. Accepted on October 23, 2023. First published online on November 20, 2023.

Stone, R.D. (2023). Vingt-quatre nouvelles espèces de Memecylon (Melastomataceae) de Madagascar. Candollea 78: 189–237. En anglais, résumés anglais et français. DOI: http://dx.doi.org/10.15553/c2023v782a10

Memecylon L. (Melastomataceae, Olisbeoideae) est un genre forestier d'arbustes et de petits arbres à large distribution paléotropicale. À Madagascar, il est l'un des dix genres ligneux les plus riches en espèces. Toutes les espèces malgaches sont endémiques de l'île, et la plupart d'entre elles ne sont connues que dans un ou deux sites. Dans le cadre de travaux en cours pour une révision taxonomique complète, vingt-quatre nouvelles espèces malgaches sont décrites et illustrées ici: M. albocoronatum R.D. Stone, M. antongilense R.D. Stone, M. articulatum R.D. Stone, M. atractocarpum R.D. Stone, M. betamponense R.D. Stone, M. bullatum R.D. Stone, M. calcicola R.D. Stone, M. dipterum R.D. Stone, M. drymophilum R.D. Stone, M. florosum R.D. Stone, M. fodinae R.D. Stone, M. fusiforme R.D. Stone, M. futilifolium R.D. Stone, M. iantarense R.D. Stone, M. ingens R.D. Stone & D. Turk, M. lemuricum R.D. Stone, M. marojejense R.D. Stone, M. montis-gallicorum R.D. Stone, M. naviculiforme R.D. Stone, M. pseudomocquerysii R.D. Stone, M. pseudopulvinatum R.D. Stone, M. subaridum R.D. Stone, M. subundulatum R.D. Stone et M. triflorum R.D. Stone. Pour chaque espèce, le statut de conservation est évalué selon les Catégories et Critères de la Liste Rouge de l'UICN.

Wilding, N., P.B. Phillipson & S. Crameri (2023). Taxonomic studies on Malagasy Dalbergia (Fabaceae). V. Eight new large tree species and notes on related Malagasy species. Candollea 78: 99–124. In English, English and French abstracts. DOI: http://dx.doi.org/10.15553/c2023v782a2

An ongoing revision of Malagasy Dalbergia L. f. (Fabaceae) has increased the number of recognized species from 48 to 64. Fifty-two (52) of the 64 are considered to grow large enough to be of potential commercial interest for their valuable timber. Eight large tree species, mostly from the north and west of Madagascar, are described and illustrated here for the first time, namely Dalbergia bosseri N. Wilding, Phillipson & Crameri; D. karatrae N. Wilding, Phillipson & Crameri; D. leandrii N. Wilding, Phillipson & Crameri; D. oronjiae N. Wilding, Phillipson & Crameri; D. rajeryi N. Wilding, Phillipson & Crameri; D. rakotovaoi Phillipson, N. Wilding & Crameri; D. sambavensis N. Wilding, Phillipson & Crameri and D. soafarae N. Wilding, Phillipson & Crameri. Risk of extinction assessments using the IUCN Red List criteria are provided and indicate that all eight species are threatened.

Received on February 2, 2023. Accepted on August 16, 2023. First published online on September 13, 2023.

Wilding, N., P.B. Phillipson & S. Crameri (2023). Études taxonomiques sur les Dalbergia (Fabaceae) malgaches. V. Huit nouvelles espèces de grands arbres et notes sur les espèces malgaches apparentées. Candollea 78: 99–124. En anglais, résumés anglais et français. DOI: http://dx.doi.org/10.15553/c2023v782a2

Une révision en cours du genre Dalbergia L. f. (Fabaceae) à Madagascar a fait passer le nombre d'espèces reconnues de 48 à 64. Cinquante-deux (52) de ces 64 espèces sont considérées comme ayant une taille suffisante pour présenter un potentiel intérêt commercial pour leur bois précieux. Huit espèces de grands arbres, principalement du nord et de l'ouest de Madagascar, sont décrites et illustrées ici pour la première fois, à savoir Dalbergia bosseri N. Wilding, Phillipson & Crameri; D. karatrae N. Wilding, Phillipson & Crameri; D. leandrii N. Wilding, Phillipson & Crameri; D. oronjiae N. Wilding, Phillipson & Crameri; D. rajeryi N. Wilding, Phillipson & Crameri; D. rakotovaoi Phillipson, N. Wilding & Crameri; D. sambavensis N. Wilding, Phillipson & Crameri et D. soafarae N. Wilding, Phillipson & Crameri. Des évaluations du risque d'extinction utilisant les critères de la liste rouge de l'UICN sont fournies et indiquent que les huit espèces sont menacées.

Feltes González, O.A., L.F. Pérez De Molas, R. Duré Rodas, J.D. Emhart Vuletich, C.M. Manchini Paredes & D. Bueno Villafañe (2023). Handroanthus abayoy (Bignoniaceae), new record for the Paraguayan flora. Candollea 78: 161–165. In Spanish, English and Spanish abstracts. DOI: http://dx.doi.org/10.15553/c2023v782a7

Handroanthus abayoy Villarroel & G.A. Parada (Bignoniaceae), a recently described species from Santa Cruz Department in Bolivia, is reported for the first time in Paraguay. A succinct morphological description is provided, as well as data concerning phenology, ecology, distribution, and conservation status in Paraguay.

Received on April 7, 2023. Accepted on October 5, 2023. First published online on November 20, 2023.

Feltes González, O.A., L.F. Pérez De Molas, R. Duré Rodas, J.D. Emhart Vuletich, C.M. Manchini Paredes & D. Bueno Villafañe (2023). Handroanthus abayoy (Bignoniaceae), nuevo registro para la flora del Paraguay. Candollea 78: 161–165. En español, resúmenes en inglés y español. DOI: http://dx.doi.org/10.15553/c2023v782a7

Handroanthus abayoy Villarroel & G.A. Parada (Bignoniaceae), especie recientemente descrita del departamento de Santa Cruz, Bolivia, se cita por primera vez para el Paraguay. Se presenta una breve descripción morfológica, así como datos de fenología, ecología, distribución y estado de conservación en Paraguay.