Hydrochorea panurensis (Spruce ex Benth.) M.V.B. Soares, M.P. Morim & Iganci, 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

7. Hydrochorea panurensis (Spruce ex Benth.) M.V.B. Soares, M.P. Morim & Iganci comb. nov.

Figs 2A , 7

Hydrochorea marginata var. panurensis (Benth.) Barneby & J.W. Grimes, Mem. New York Bot. Gard. 74: 32. 1996. Type: based on Pithecellobium panurense Spruce ex Benth., syn. nov.

Hydrochorea marginata var. scheryi Barneby & J.W. Grimes, Mem. New York Bot. Gard. 74: 32. 1996. Type: Venezuela, at Sanariapo, Territorio Federal Amazonas, Llewellyn Williams 15953 (lectotype first step, designated by Barneby and Grimes 1996, p. 32, as holotype, here corrected: F; lectotype second step, here designated: F [V0058706F], digital image!; isotypes: F [V0058707F] digital image!), G [G00365761] digital image!, GH [GH00060404] digital image! K [K0005279] digital image!, MO [MO954357] digital image!, MO [MO954358] digital image!), NY [NY00334620] digital image! US [US00000401] digital image!, US [US00385625] digital image!, VEN [VEN2237] digital image!, syn. nov.

Basionym.

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

Type material.

Brazil, in silvis ‘Gapó’ ad flumen Uaupés prope Panuré, prov. do Alto Amazonas, Spruce 2425 (lectotype first step, designated by Barneby and Grimes 1996, p. 32, as holotype, here corrected: K; lectotype second step, here designated: K [K000528008]!; isolectotypes: E [E00313845] digital image!, F, [V0058739F] digital image!, G [G00365356] digital image!, G [G00365687] digital image!, GH [GH00063965] digital image!, K [K000528007]!, NY [NY334690], P [P03094382] digital image!, P [P03094383] digital image!, RB [RB00708599]!).

Distribution and habitat.

Brazil, Venezuela. Hydrochorea panurensis occurs in seasonally flooded Amazonian sites along rocky stream banks and ecotone with gallery forests.

Notes.

Ducke (1949) considered Pithecellobium panurense as a form of P. marginatum , considering the vegetative characters to be more important taxonomically than the differences between the flowers of those taxa. Barneby and Grimes (1996) moved P. panurense to Hydrochorea as H. marginata var. panurensis . However, Hydrochorea panurense has diagnostic floral characters which distinguish it from H. marginata . The floral buds of H. panurense have the corolla covered by the calyx; the flowers are glabrous and the terminal flower has a tubular calyx (vs. calyx not covering the corolla in the floral buds, pubescent flowers, and calyx of the terminal flower campanulate in H. marginata ). Barneby and Grimes (1996) also described H. marginata var. scheryi , distinguishing it from H. marginata var. panurensis only by the pedicel of the peripheral flowers, this 4-5 mm long. (vs. 6.5-13 mm long in H. marginata var. panurensis ). Barneby and Grimes (1996) emphasized, however, that this is the only character to distinguish between the two taxa. In the present study we consider H. marginata var. scheryi to be a synonym of H. panurensis .

A second step lectotypification is designated here for both H. panurensis and H. marginata var. scheryi , since the material that Barneby and Grimes (1996) recognised as holotypes consists of two sheets in both cases and they did not select lectotypes from amongst these sheets (Art. 9.10,9.17; Turland et al. 2018).

Selected specimens examined.

Brazil, Amazonas: Barcelos, Serra do Araçá, Rio Araca à 13 h de Barcelos, 28 July 1985, Silva 389 (INPA); Sao Gabriel da Cachoeira. Margem do Rio Icana em direção a comunidade Camarão, 0°48'35.8"N, 67°32'10"W, 19 July 2012, Morim, M.P., Iganci, J.R.V, Bonadeu F & Koenen, E. 563 (RB, Z) . Venezuela, Amazonas: Rio Casiquiare , 11 November 1959, Wurdack & Adderley 43407 (IAN) .

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.

Figure 7. Hydrochorea panurensis (Spruce ex Benth.) M. V. B. Soares, M. P. Morim & Iganci A branch with inflorescences B, C extra-floral nectaries D peripheral flower E peripheral flower bud F terminal flower bud G terminal flower H terminal flower longitudinal section I leaflet. A-I from Wurdack & Adderley 43618. Illustration by Alex Pinheiro.