Plantae Fabales Fabaceae Vinicius Batista SoaresMarcosMathieu KoenenErik JozefRicardo Vieira IganciJoãoMorimMarli PiresA new generic circumscription of Hydrochorea (Leguminosae, Caesalpinioideae, mimosoid clade) with an amphi-Atlantic distributionPhytoKeys2208202220540143710.3897/phytokeys.205.82775 DAD0E817-D749-5B44-A35A-CA0660B3173F Hydrochorea corymbosa (Rich.) Barneby & J.W. Grimes, New York Bot. Gard. 74(1): 27. 1996.Fig. 2A, C, 3A-C, 4 Pithecellobium subcorymbosum Hoehne [as Pithecolobium], Comiss. Linhas Telegr. Estratég., Mato Grosso-Amazonas, Bot. 8: 18, Ic. 133. 1919. Type: Brazil, Mato Grosso, São Luiz de Cáceres, nas margens do rio Paraguai, perto da Campina, Hoehne 4582 (lectotype, designated here from amongst the syntypes: R! [R000003169]; isolectotype: SP).Basionym.

Mimosacorymbosa Rich., Actes Soc. d’Hist. Nat. Paris 1: 113. 1792.

10.3897/phytokeys.205.82775.figure3F15781F7-18D7-539C-9159-C9D279BC1FB6

The genus Hydrochorea Barneby & J.W. Grimes (continued). Species from the Americas A flowering branch of Hydrochoreacorymbosa (Rich.) Barneby & J.W. Grimes B close-up of inflorescence of H.corymbosaC discolorous leaves of H.corymbosaD close-up of inflorescence of Hydrochoreapanurensis (Spruce ex Benth.) M.V.B. Soares, M.P. Morim & Iganci E unripe lomentiform pod of H.panurensisF close-up of inflorescence of Hydrochoreapedicellaris (DC.) M.V.B. Soares, Iganci & M.P. Morim, with a few peripheral flowers removed to expose sessile terminal flowers G unripe pods of H.pedicellarisH dehisced follicular pods of H.pedicellaris showing papery septate endocarp I detail of primary rachis of H.pedicellaris showing interpinnal extra-floral nectaries J inflorescence of Hydrochoreauaupensis M.P. Morim, Iganci & E.J.M. Koenen showing large sessile central flower and pedicellate peripheral flowers K unripe crypto-lomentiform pod and seed enveloped by septate endocarp of H.uaupensis; African species L inflorescence of Hydrochoreaobliquifoliolata (De Wild.) E.J.M. Koenen M pinnae of Hydrochorearhombifolia (Benth.) E.J.M. Koenen showing rhombic leaflets. A–E, J, K Erik Koenen F-I Colin Hughes L Jan Wieringa M William Hawthorne. Vouchers A–CJ.R.V. Iganci 862D, EM.P. Morim 563F–IL.P. Queiroz 15529J, KM.P. Morim 577LJ.J. Wieringa 6519M unvouchered.

https://binary.pensoft.net/fig/73349510.3897/phytokeys.205.82775.figure44903C175-186D-5953-A77F-9CB56372C89F

Hydrochoreacorymbosa (Rich.) Barneby & J.W. Grimes A branch with inflorescences B–D extra-floral nectaries E peripheral flower bud F peripheral flower G terminal flower bud H terminal flower I fruit J seed. A, E–H from M.V.B. Soares 75B–D from M.V.B. Soares 180I–J from M.V.B. Soares 174. Illustration by Alex Pinheiro.

https://binary.pensoft.net/fig/733496Type material.

French Guiana, frequens in sylvis ripariis fluvii Kourou, Louis Claude Richard s.n. (lectotype, designated by Barneby and Grimes 1996, p. 27, as holotype, here corrected: P [P02142909] digital image!).

Distribution and habitat.

Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Paraguay, Peru, Venezuela. Hydrochoreacorymbosa occurs in periodically or permanently inundated riparian forest, gallery forest, and open vegetation, up to 480 m elevation (Barneby and Grimes 1996).

Notes.

Hydrochoreacorymbosa is morphologically similar to H.gonggrijpii by its leaves with (2–)3–6 pairs of pinnae (3–5 pairs of pinnae in H.gonggrijpii), but differs by presenting (4–)5–11(–14) leaflet pairs per pinnae (vs. (12–)14–35 in H.gonggrijpii). Hydrochoreacorymbosa has a wide distribution in the Brazilian Amazon, and displays wide morphological plasticity. Barneby and Grimes (1996) recognised the specimen Louis Claude Richard s.n. (P02142909) as holotype, although the species protologue did not present a type specimen. The specimen does represent original material that the author associated with the taxon, being a specimen collected by the author and annotated as Mimosacorymbosa. Thus, Louis Claude Richard s.n. (P02142909) is here corrected to lectotype (Art. 9.3, 9.4, 9.8 and 9.10; Turland et al. 2018).

Selected specimens examined.

Brazil, Amazonas: São Gabriel da Cachoeira, entre Assunção do Içana e Camarão, mato de Igapó, margem do rio, 10 July 2012, J.R.V. Iganci 862 (RB). Bolivia, Pando: Federico Roman, bordo del Río Abuna, 18 November 2006, S. Altamirano & H. Ramos 4293 (K). Colombia, Vaupés: Mitú and Vicinity, lower rio Kubiyú, 26 September 1976, Zarucchi 2147 (INPA). Ecuador, Francisco de Orellana: Estación Científica Yasuní, Río Tiputini, este de la Carretera Repsol-YPF, km 7 desvío hacia el pozo Tivacuno, Laguna Herradura, 20 April 1999, G. Villa 177 (K). Guyana: Potaro-Siparuni, riparian zone lower Kuribrong, April 2010, Zartman et al. 8002 (INPA). Peru, Loreto: Jenaro Herrena, Cano Supay, flooded forest along cano, 23 May 2002, T.D. Pennington et al. 17430 (K). Venezuela, Amazonas: Departamento Rio Negro, middle part of the Río Baria, 21 July 1984, G. Davidse 27570 (K).

10.3897/phytokeys.205.82775.figure2F621E15B-F691-50E8-809E-FE761DB01574

The genus Hydrochorea Barneby & J.W. Grimes A The amphi-atlantic geographic distribution of HydrochoreaBHydrochoreapedicellaris (DC.) M.V.B. Soares, Iganci & M.P. Morim foliage and fruits CHydrochoreacorymbosa (Rich.) Barneby & J.W. Grimes foliage and fruits DHydrochoreapanurensis (Spruce ex Benth.) M.V.B. Soares, M.P. Morim & Iganci foliage and fruits EHydrochoreauaupensis M.P. Morim, Iganci & E.J.M. Koenen in habitat, with foliage and fruits F Flowers of H.uaupensis after rain G mature fruits of H.uaupensis. B, C from M.V.B Soares D from D. Cardoso E–G from J.R.V. Iganci.

https://binary.pensoft.net/fig/733494BarnebyRCGrimesJ (1996) Silk tree, guanacaste, monkey’s earring: A generic system of the synandrous Mimosaceae of the Americas. Part I. Abarema, Albizia, and allies. Memoirs of the New York Botanical Garden 74(1).TurlandNJWiersemaJHBarrieFRGreuterWHawksworthDLHerendeenPSKnappSKusberWHLiD-ZMarholdKMayTWMcNeillJMonroAMPradoJPriceMJSmithGF [Eds] (2018) International Code of Nomenclature for algae, fungi, and plants (ShenzhenCode) adopted by the Nineteenth International Botanical Congress Shenzhen, China, July 2017. Regnum Vegetabile 159. Koeltz Botanical Books, Glasshütten. https://doi.org/10.12705/Code.2018