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 8172C4D2-1911-5DD1-9299-9AD42912A6C2 Hydrochorea marginata (Spruce ex Benth.) Barneby & J.W. Grimes, Mem. New York Bot. Gard. 74(1): 29. 1996.Figs 2A, D, 6Basionym.

Pithecellobium [as Pithecolobium] marginatum Spruce ex Benth., Trans. Linn. Soc. London 30: 586. 1875.

Type material.

Brazil, Barra, by a stream [Prov. Rio Negro], Spruce 1658 (lectotype, designated by Barneby and Grimes 1996, p. 31: K [K000528011]!; isolectotypes: E [E00313848] digital image!, F [V0058733F] digital image!], G [G275450] digital image!, P [P03094432] digital image!, P [P03094430] digital image!).

10.3897/phytokeys.205.82775.figure6CFBBA7FC-9464-56E7-B7AE-AE6444026081

Hydrochoreamarginata (Spruce ex Benth.) 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 leaflet. A–D, F, H, I from A. Carlos et al. 066E, G from C. Ferreira et al. 7260. Illustration by Alex Pinheiro.

https://binary.pensoft.net/fig/733498Distribution and habitat.

Brazil and Venezuela. Hydrochoreamarginata occurs in Amazonia, in flooded areas and along riverbanks and lake shores.

Notes.

Barneby and Grimes (1996) considered H.marginata to comprise three varieties, H.marginatavar.panurensis (Benth.) Barneby & J.W. Grimes, H.marginatavar.scheryi Barneby & J.W. Grimes, and Hydrochoreamarginatavar.marginata. Hydrochoreamarginatavar.panurensis is recognized at the species level in this treatment, and H.marginatavar.scheryi is placed as a synonym of H.panurensis because we identified no morphological diagnostic characters that support them as independent taxa. Both these taxonomic decisions are discussed under H.panurenis.

Selected specimens examined.

Brazil: Amazonas, Rio Negro between Moreira and Rio Arirahá, 13 October 1971, G.T. Prance 15206 (NY).

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).