A taxonomic revision of the genus Eperua (Leguminosae, Detarioideae, Detarieae) Author Fortes, Elenice A. Programa de Pós-Graduação em Biologia Vegetal, Instituto de Biologia, Universidade Estadual de Campinas, Rua Monteiro Lobato, 255, Campinas, São Paulo, Brazil, 13083 - 862. forteselenice @ gmail. com; https: // orcid. org / 0000 - 0001 - 8307 - 6534 forteselenice@gmail.com Author Dos, Ilka P. Programa de Pós Graduação em Ciências Biológicas, área de concentração Botânica Tropical, Universidade Federal Rural da Amazônia e Museu Paraense Emílio Goeldi, Av. Perimetral, 1901, Terra Firme, Belém, Pará, Brasil, CEP 66077 - 83 o. ilkapreis @ gmail. com; https: // orcid. org / 0009 - 0001 - 2511 - 2821 ilkapreis@gmail.com Author Steege, Hans Ter Naturalis Biodiversity Center, Leiden, The Netherlands; hans. tersteege @ naturalis. nl; https: // orcid. org / 0000 - 0002 - 8738 - 2659 & Quantitative Biodiversity Dynamics, Dept. of Biology, Utrecht University, Utrecht, The Netherlands hans.tersteege@naturalis.nl Author Aymard, Gerardo UNELLEZ-Guanare, Programa de Ciencias del Agro y del Mar, Herbario Universitario (PORT), Mesa de Cavacas, estado Portuguesa, Venezuela, 3350; gerardo. aymard @ gmail. com; https: // orcid. org / 0000 - 0001 - 9405 - 0508; & Compensation International Progress S. A. Ciprogress-Greenlife, Bogotá D. C., Colombia gerardo.aymard@gmail.com Author Secco, Ricardo De S. Museu Paraense Emilio Goeldi - MPEG Museu Paraense Emílio Goeldi / Universidade Federal Rural da Amazônia, Programa de Pós-Graduação em Ciências Biológicas - Botânica Tropical, Belém, Pará, Brazil, 66077 - 830 rsecco @ museu-goeldi. br; https: // orcid. org / 0000 - 0002 - 3295 - 7929 rsecco@museu-goeldi.br Author Martins-Da-Silva, Regina Célia V. Empresa Brasileira de Pesquisa Agropecuária, Embrapa Amazônia Oriental, Laboratório de Botânica, Trav. Enéas Pinheiro, s / n, Marco, CEP 66095 - 903 Author Mansano, Vidal F. Programa de Pós-Graduação em Biologia Vegetal, Instituto de Biologia, Universidade Estadual de Campinas, Rua Monteiro Lobato, 255, Campinas, São Paulo, Brazil, 13083 - 862. forteselenice @ gmail. com; https: // orcid. org / 0000 - 0001 - 8307 - 6534 & Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, Rua Pacheco Leão, 915, Rio de Janeiro, RJ, Brazil, 22460 - 030 vidalmansano @ gmail. com; https: // orcid. org / 0000 - 0002 - 7204 - 0744 * Corresponding author & Programa de Pós-Graduação em Biologia Vegetal, Instituto de Biologia, Universidade Estadual de Campinas, Rua Monteiro Lobato, 255, Campinas, São Paulo, Brazil, 13083 - 862. forteselenice @ gmail. com; https: // orcid. org / 0000 - 0001 - 8307 - 6534 forteselenice@gmail.com text Phytotaxa 2023 2023-09-28 617 1 1 127 http://dx.doi.org/10.11646/phytotaxa.617.1.1 journal article 10.11646/phytotaxa.617.1.1 1179-3163 8389766 16. Eperua reddeniae E.A. Fortes & Mansano, sp. nov. ( Figures 8 , 48 , 49 , 50 ) Type:— GUYANA . Cuyuni-Mazaruni , Mazaruni River , small islands along river, 90 m elev., 6°0’12.6”N 59°13’28.9”W , 11 October 2004 , Redden K . M . et al. 3274 ( holotype US [00808373]!, isotypes CAY [109816, 109817] image!, INPA [0220628]!) Diagnosis: — Eperua reddeniae has short and erect inflorescences, non-tubular corollas, and exserted stamens. It differs from species with the same type of inflorescence, corolla, and stamen by the combination (see Table 3 ): stipules joined at the base, inconspicuous pellucid punctate to epunctate leaflets, slightly revolute margins, coppery inflorescence indumentum, pink to purple petals, stamens joined basally in a diadelphous sheath, dorsal one free, sheath irregularly tomentose in the middle-high portion and glabrous at the base, tomentose ovary, tomentulose fruits with entire margins. Tree 8–20.0 m tall. Trunk 20.0 cm in diameter, bark not seen. Stipules 10.9–19.2 × 6.3–12.2 mm , joined at the base, foliaceous, persistent. Leaves 4–5-jugate; petioles 1.0– 1.5 cm long; rachis 10.2–15.0 cm long; petiolules 6.2–8.2 mm long; blades 5.3–11.8 × 2.8–5.0 cm, coriaceous, glabrous, pellucid-punctate to epunctate, discolorous, equilateral, lower pair elliptic to ovate, middle pair elliptic, upper pair elliptic, apex attenuate to acuminate, mucronate, base symmetrical to asymmetrical, lower pair base subcordate to obtuse, middle pair base obtuse, upper pair base obtuse, margin flat to slightly revolute, secondary venation with two intramarginal veins, sometimes one, vein closer to the margin not continuous, main vein straight, prominent on the adaxial surface, tertiary veins conspicuous, areoles smaller, concave. Inflorescences terminal or axillary, panicle, erect, tomentose, coppery, 13.1–16.0 cm long, lateral racemes 2.1–11.8 cm long, alternate and distichous; bracts caducous, not seen; bracteoles 2.1–3.8 × 2.3–2.4 mm , ovate, cucullate, apex gland absent, tomentose on both sides, coppery, caducous, attached to the lower middle portion of the pedicels; pedicel 18.4–26.2 mm long, 1.3–2.1 mm in diameter, not twisted, tomentose, coppery; buds 1.1–1.5 cm long, 0.6–0.7 cm in diameter, tomentose, coppery. Flowers : hypanthium 4.3–6.3 mm long, 4.9–6.1 mm in diameter, cup-shaped, equilateral, tomentose, coppery; sepal 1.9–2.7 × 0.6–1.2 cm , elliptic to oblong, unequal, the outer ones larger, cucullate, apex gland absent, green, tomentose externally, coppery, inner sepals scarious marginally; adaxial petal 2.0–2.1 × 3.2–4.0 cm, oblate, non-tubular, apex rounded, base truncate, pink to purple, glabrous; petalodia 0.5–0.8 × 0.8–1.0 mm; stamens , exserted, joined basally in a diadelphous sheath, dorsal one free, longer filaments 4.2–5.0 cm long, shorter filaments 3.0 cm long, sheath equilateral, 5.2–8.0 mm long, sheath irregularly tomentose in the middle-high portion and glabrous at the base, free filaments glabrous, coppery, anthers 5.2–6.6 × 1.0– 1.5 mm , rectangular; ovary 9.2–12.0 × 4.0– 4.2 mm , oblaceolate, tomentose, cream (fresh) to coppery (dried), stipe 8.8–15.0 mm long, tomentose, style 3.5–5.0 cm long, stigma obtuse to capitate. Legumes 21.0 × 7.6 cm , stipe not seen, oblanceolate-falcate, apex acute, apiculate, margin entire, coppery, veins absent, tomentulose, coppery. Seeds , 4.3 × 2.6 cm , ovate to oblong. Phenology:— Flowering in September and October.; fruiting in October Distribution:— Guyana ( Cuyuni-Mazaruni ). Distribution and habitat:— Floodplain ( gallery) forests on mixed brown and white sand soils, at 63–90 m elev. Conservation status:— Categorized as Data Deficient (DD) according to the IUCN criteria ( IUCN 2012 , IUCN Standards and Petitions Committee 2022 ) as it is known by only two specimens . Occurrence in protected areas:— Unknown. Etymology:— The specific epithet is a tribute to Karen Redden, a botanist who studied Detarieae groups and the Guyana Shield Flora, besides collecting a lot of species of Eperua (over eighty specimens and 11 species), including the type specimen of this new species. Vernacular names:— Described as having the common name “tricel” in the Redden K.M. et al. 3260 collection label. However, a similar name, “trysil”, is the vernacular name of the locally quite common species, Pentaclethra macroloba Kuntze , and likely the name “tricel” was mistakenly coined by the collectors (ter Steege pers. obs.) Uses:— Unknown. Taxonomic notes:— Eperua reddeniae , E. froesii , E. cerradoensis , E. duckeana and E. schomburgkiana are the only species with short and erect inflorescences that have non-tubular corolla, exserted stamens, falcate fruit with a 3:1 length/width proportion (vs. tubular corolla, included stamens, non-falcate fruit with a 1:1 to 2:1 length/width proportion in other short and erect inflorescence species). They also share multijugate leaves with straight leaflets and inflorescence with dense indumentum. Additionally, E. reddeniae shares caducous bracteoles and stamens joined in a diadelphous sheath 9+1 with E. duckeana and E. schomburgkiana ; and irregularly tomentose sheath with E. schomburgkiana . Similarities and differences between species of this group are summarized in Table 3 . The flower of E. reddeniae is most similar to E. duckeana by the non-glabrous sheath, ovary, and fruits, and the diadelphous stamen sheath. Besides the allopatric distribution ( E. reddeniae is restricted to Guyana , and E. duckeana to the Central Amazonia, Figure 8 ), E. reddeniae differs from E. duckeana mainly by the coppery inflorescence indumentum (vs. brownish-yellow in E. duckeana ), pink to purple petals (vs. white in E. duckeana ), and irregularly tomentose sheath (vs. entirely tomentose in E. duckeana ). Specimens examined ( Paratypes ):— GUYANA . Cuyuni-Mazaruni , Mazaruni River , unnamed falls (possible Carin Crow Falls ), 0.26 miles NW of base camp, 63 m elev., 5°57’25”N 59°18’41.8”W , 09 September 2004 , Redden K . M . et al. 3260 ( US [00889812]!).