Pseudalbizzia Britton & Rose, N. Am. Fl. 23: 48. 1928.

Bruneau, Anne, de Queiroz, Luciano Paganucci, Ringelberg, Jens J., Borges, Leonardo M., Bortoluzzi, Roseli Lopes da Costa, Brown, Gillian K., Cardoso, Domingos B. O. S., Clark, Ruth P., Conceicao, Adilva de Souza, Cota, Matheus Martins Teixeira, Demeulenaere, Else, de Stefano, Rodrigo Duno, Ebinger, John E., Ferm, Julia, Fonseca-Cortes, Andres, Gagnon, Edeline, Grether, Rosaura, Guerra, Ethiene, Haston, Elspeth, Herendeen, Patrick S., Hernandez, Hector M., Hopkins, Helen C. F., Huamantupa-Chuquimaco, Isau, Hughes, Colin E., Ickert-Bond, Stefanie M., Iganci, Joao, Koenen, Erik J. M., Lewis, Gwilym P., de Lima, Haroldo Cavalcante, de Lima, Alexandre Gibau, Luckow, Melissa, Marazzi, Brigitte, Maslin, Bruce R., Morales, Matias, Morim, Marli Pires, Murphy, Daniel J., O'Donnell, Shawn A., Oliveira, Filipe Gomes, Oliveira, Ana Carla da Silva, Rando, Juliana Gastaldello, Ribeiro, Petala Gomes, Ribeiro, Carolina Lima, Santos, Felipe da Silva, Seigler, David S., da Silva, Guilherme Sousa, Simon, Marcelo F., Soares, Marcos Vinicius Batista & Terra, Vanessa, 2024, Advances in Legume Systematics 14. Classification of Caesalpinioideae. Part 2: Higher-level classification, PhytoKeys 240, pp. 1-552 : 1

Pseudalbizzia Britton & Rose, N. Am. Fl. 23: 48. 1928.

Figs 247 , 248

Arthrosamanea Britton & Rose, Ann. New York Acad. Sci. 35: 128. 1936. Type: Arthrosamanea pistaciifolia (Willd.) Britton & Rose ex Britton & Killip [≡ Mimosa pistaciifolia Willd. (≡ Pseudalbizzia pistaciifolia (Willd.) E.J.M. Koenen & Duno)]

Albizia sect. Arthrosamanea (Britton & Rose) Barneby & J.W. Grimes, Mem. New York Bot. Gard. 74(1): 206. 1996. Type: Albizia pistaciifolia (Willd.) Barneby & J.W. Grimes [≡ Mimosa pistaciifolia Willd. (≡ Pseudalbizzia pistaciifolia (Willd.) E.J.M. Koenen & Duno)]

Type.

Pseudalbizzia berteroana (Balb. ex DC.) Britton & Rose [≡ Acacia berteroana Balb. ex DC.]

Description.

Trees or rarely treelets, unarmed. Stipules puberulent to glabrous, deltate, narrowly triangular, triangular-ovate, narrowly ovate, or narrowly lanceolate, veinless or faintly 3-veined, falling early to tardily. Leaves bipinnate, extrafloral nectaries sessile between the first pair of pinnae, near or well below mid-petiole, round, elliptic or vertically elongate, cupuliform to obsolete; pinnae (1) 2-15 (19) pairs; leaflets (2) 16-52 (63) pairs, alternate, variable in size and shape, the first pair of leaflets often reduced to paraphyllidia. Inflorescences capitate or corymbose-umbellate. Flowers heteromorphic, short-pedicellate or sessile; calyx gamosepalous; corolla gamopetalous, petals 5 (6); stamens numerous, filaments fused into a tube, stemonozone present, anthers rimose; pollen in 16-celled polyads; ovary glabrous or pubescent. Fruit lomentiform or the endocarp fragmented into 1-seeded envelopes, the valves papery, coriaceous, or glossy ligneous, straight or nearly so, decurved or plano-compressed, tardily and inertly dehiscent through both sutures or indehiscent. Seeds disciform, oblong-ellipsoid, elliptic, flattened, translucent, pleurogram present.

Chromosome number.

2 n = 26 (Rico Arce 1992; Santos et al. 2012).

Included species and geographic distribution.

Seventeen species, in the Neotropics, from Argentina to Colombia in South America, and from north-west Mexico to Panama in North America, extending weakly into the West Indies (Fig. 248 ).

Ecology.

Humid, semi-deciduous, seasonally inundated, and seasonally dry tropical and extratropical forests and woodlands.

Etymology.

In reference to Albizia Durazz.

Human uses.

The wood of P. polycephala (Benth.) E.J.M. Koenen & Duno ( ‘farinha-seca’ in Brazil), is used for laminate wood floors and for internal use in civil construction ( Carvalho 2006).

Notes.

The name Pseudalbizzia was recently resurrected mostly to accommodate species of Albizia sect. Arthrosamanea ( Peraza et al. 2022). Barneby and Grimes (1996) had noted the determinate branches lacking sylleptic buds giving rise to vegetative branches as a distinctive character to recognise the 19 species under A. sect. Arthrosamanea , as well as remarking on the resemblance of the lomentiform pods of a subset of species of A. sect. Arthrosamanea to those of Hydrochorea . Phylogenomic ( Koenen et al. 2020a; Ringelberg et al. 2022; Peraza et al. 2022) and phylogenetic analyses based on nuclear ribosomal sequences ( Peraza et al. 2022) confirmed the non-monophyly of Albizia and showed that all species sampled from A. sect. Arthrosamanea formed a clade, sister to a clade composed of the remaining genera of the Jupunba clade (Fig. 246 ). These analyses also revealed that lomentiform fruits are independently derived from indehiscent septate fruits in Pseudalbizzia and Hydrochorea , and that morphological adaptation to hydrochory has occurred several times independently across the ingoid clade.

A new phylogenetically-based infrageneric classification, comprising five sections, was presented by Peraza et al. (2022) to account for the non-monophyly of the series of A. sect. Arthrosamanea of Barneby and Grimes (1996).

Taxonomic references.

Barneby and Grimes (1996); Peraza et al. (2022).

Figures

Figure 246. Generic relationships in the Jupunba clade (tribe Mimoseae). For description of phylogeny and support values, see Fig. 6 caption (page 63).

Figure 247. Jupunba clade flowers (A-E) and fruits (F-K) A Hydrochorea corymbosa (Rich.) Barneby & J. W. Grimes B Hydrochorea uaupensis M. P. Morim, Iganci & E. J. M. Koenen C Jupunba langsdorffii (Benth.) M. V. B. Soares, M. P. Morim & Iganci D Pseudalbizzia niopoides (Spruce ex Benth.) E. J. M. Koenen & Duno E Pseudalbizzia polycephala (Benth.) E. J. M. Koenen & Duno F Pseudalbizzia inundata (Mart.) E. J. M. Koenen & Duno G Hydrochorea corymbosa H Hydrochorea uaupensis I, J Hydrochorea pedicellaris (DC.) M. V. B. Soares, Iganci & M. P. Morim K Jupunba campestris (Benth.) M. V. B. Soares, M. P. Morim & Iganci. Photo credits A, G, I-K MVB Soares B, C, H J Iganci D-F RT Queiroz https: // rubens-plantasdobrasil. blogspot. com /.

Figure 248. Distribution of Pseudalbizzia based on quality-controlled digitised herbarium records. See Suppl. material 1 for the source of occurrence data.