Hydrochorea elegans (Ducke) M.V.B. Soares, Iganci & M.P. Morim, 2022

Vinicius Batista Soares, Marcos, Mathieu Koenen, Erik Jozef, Ricardo Vieira Iganci, Joao & Morim, Marli Pires, 2022, A new generic circumscription of Hydrochorea (Leguminosae, Caesalpinioideae, mimosoid clade) with an amphi-Atlantic distribution, PhytoKeys 205, pp. 401-437 : 401

2. Hydrochorea elegans (Ducke) M.V.B. Soares, Iganci & M.P. Morim comb. nov.

Fig. 2A

Balizia elegans (Ducke) Barneby & J.W. Grimes, Mem. New York Bot. Gard. 74(1): 40 1996. Albizia elegans (Ducke) L. Rico, Novon, 9(4): 556. 1999.

Albizia duckeana L. Rico, syn. nov., Kew Bull. 55(2): 404. 2000. Type: based on Pithecellobium elegans Ducke.

Basionym.

Pithecellobium elegans 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. Hydrochorea elegans occurs in primary rain forest, up to 350 m elevation ( Barneby and Grimes 1996).

Notes.

Hydrochorea elegans 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 ). Hydrochorea elegans has a disjunct distribution between hylaean Brazil and Costa Rica and Nicaragua.

Selected specimens examined.

Brazil, Rondônia: Porto Velho, área do Reservatorio da Usina Hidreletrica 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) .

Figures

Figure 2. The genus Hydrochorea Barneby & J. W. Grimes A The amphi-atlantic geographic distribution of Hydrochorea B Hydrochorea pedicellaris (DC.) M. V. B. Soares, Iganci & M. P. Morim foliage and fruits C Hydrochorea corymbosa (Rich.) Barneby & J. W. Grimes foliage and fruits D Hydrochorea panurensis (Spruce ex Benth.) M. V. B. Soares, M. P. Morim & Iganci foliage and fruits E Hydrochorea uaupensis 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.