Painteria Britton & Rose, N. Amer. Fl. 23: 35. 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

Painteria Britton & Rose, N. Amer. Fl. 23: 35. 1928.

Figs 217 , 223

Type.

Painteria revoluta (Rose) Britton & Rose [≡ Pithecellobium revolutum Rose]

Description.

Shrubs 0.3-15 cm. Stipules of long-shoots lignescent, of short-shoots acicular or subulate, rather closely imbricate. Leaves bipinnate, extrafloral nectaries between proximal pinna-pair, rarely between 2 pairs; pinnae 1-7 pairs; leaflets 3-20 pairs per pinna, suborbicular, elliptic, and broadly oblong, completely revolute in P. revoluta , venation palmate or almost simple. Inflorescences shortly spiciform capitula arising from brachyblasts. Flowers sessile or almost so, homomorphic, 5-merous; calyx campanulate or hemispherical, lobes deltoid; corolla sub-cylindrical, the lobes either ascending or recurving; stamens 28-76, the tube either included or shortly exserted; pollen in 16-celled polyads, more or less isodiametric; intrastaminal small callosities, sometimes obscure or wanting; ovary slenderly ellipsoid, compressed, on a short stipe. Fruits compressed legumes, retrofalcate or retrocircinnate, the leathery valves biconvex over each seed, the cavity continuous; dehiscence tardy through both sutures; funicle straight or sinuous, not sigmoid. Seeds compressed-lentiform.

Chromosome number.

Unknown.

Included species and geographic distribution.

Two species, endemic to the central Mexican Plateau and adjacent arid interior valleys of Puebla and Oaxaca (Fig. 223 ).

Ecology.

Plains and hillsides in desert grassland and brush communities, mainly between 1400-2750 m.

Etymology.

The genus is named after Joseph Hannum Painter (1879-1908), botanist and assistant curator in the division of plants of the United States National Museum, who collected the type species in Querétaro.

Human uses.

Unknown.

Notes.

Britton and Rose (1928) provided the first taxonomic revision of the genus, which was updated by Barneby and Grimes (1996) who recognised three species, one of which was later segregated as the genus Ricoa by Tamayo-Cen et al. (2022). The flowers of P. revoluta were first described by Calderón de Rzedowski (2007).

Taxonomic references.

Barneby and Grimes (1996); Britton and Rose (1928); Calderón de Rzedowski (2007); Tamayo-Cen et al. (2022).

Figures

Figure 217. Morphology of selected species of the Pithecellobium clade A Ebenopsis ebano (Berland.) Barneby & J. W. Grimes, fruit B, C Havardia albicans (Kunth) Britton & Rose B leaves C inflorescence D Gretheria campylacantha (L. Rico & M. Sousa) Duno & Torke, fruit E Ricoa leptophylla (DC.) Duno & Torke, inflorescence and young flowers F Painteria elachistophylla (A. Gray ex S. Watson) Britton & Rose, fruit G Pithecellobium dulce (Roxb.) Benth. habit H Pithecellobium unguis-cati (L.) Benth. inflorescence I Pithecellobium lanceolatum (Humb. & Bonpl. ex Willd.) Benth. pod and seeds J Pithecellobium winzerlingii Britton & Rose pod and seed K Sphinga acatlensis (Benth.) Barneby & J. W. Grimes flowers L Sphinga platyloba (Bertero ex DC.) Barneby & J. W. Grimes flowers. Photo credits A, E, F, H R Duno de Stefano B, C, J GA Romero Gonzalez D, I, K CE Hughes G D Pedersen L C Ramirez.

Figure 223. Distribution of Painteria based on quality-controlled digitised herbarium records. See Suppl. material 1 for the source of occurrence data.