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 C88905FF-CD0D-5E1C-8F7A-C41EA9C07A4E Hydrochorea elegans urn:lsid:ipni.org:names:77303827-1 (Ducke) M.V.B. Soares, Iganci & M.P. Morimcomb. nov.Fig. 2A Balizia elegans (Ducke) Barneby & J.W. Grimes, Mem. New York Bot. Gard. 74(1): 40 1996. Albiziaelegans (Ducke) L. Rico, Novon, 9(4): 556. 1999. Albizia duckeana L. Rico, syn. nov., Kew Bull. 55(2): 404. 2000. Type: based on Pithecellobiumelegans Ducke.Basionym.

Pithecellobiumelegans Ducke [as Pithecolobium], Arch. Jard. Bot. Rio de Janeiro 3: 64. 1922.

Type material.

Brazil, in silvis non inundatis, prope Alcobaca (Tocantins), A. Ducke 16271 (lectotype, designated by Barneby and Grimes 1996, p. 40: MG [MG00016271], digital image!; isolectotypes: G [G00359898] digital image!, MG, P [P03093819] digital image!, R [R000002384] digital image!, RB [RB10177]!, US [US1040853] digital image!, US [US00000336] digital image!, US [US00610722] digital image!).

Distribution and habitat.

Bolivia, Brazil, Costa Rica, Ecuador, Honduras, Nicaragua, Peru. Hydrochoreaelegans occurs in primary rain forest, up to 350 m elevation (Barneby and Grimes 1996).

Notes.

Hydrochoreaelegans has a morphological affinity with H.pedicellaris, as already pointed out by Ducke (1922) and by Barneby and Grimes (1996). However, the corolla of peripheral flowers is larger (8–10 mm long) in H.elegans than in H.pedicellaris (up to 7.5 mm long). Ducke (1922) and Barneby and Grimes (1996) also commented on the similarity between the fruit of both species, but the fruits of H.elegans are indehiscent (vs. follicular dehiscence in H.pedicellaris). Hydrochoreaelegans has a disjunct distribution between hylaean Brazil and Costa Rica and Nicaragua.

Selected specimens examined.

Brazil, Rondônia: Porto Velho, área do Reservatório da Usina Hidrelétrica de Samuel, 15 June 1986, C.A.C. Ferreira 7458 (K). Costa Rica, Limón: Talamanca, Fila Carbon, Finca de Pedro Bolivar, 25 May 1999, O. Valerde 1175 (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).DuckeA (1922) Plantes nouvelles ou peu connus de la région Amazonienne. Archivos do Jardim Botânico do Rio de Janeiro 3: 64.