Arapatiella Rizzini & A. Mattos, Rev. Bras. Biol. 32(3): 323. 1972.

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

Arapatiella Rizzini & A. Mattos, Rev. Bras. Biol. 32(3): 323. 1972.

Figs 79 , 80 , 81 , 84

Type.

Arapatiella trepocarpa Rizzini & A. Mattos [= Arapatiella psilophylla (Harms) R.S. Cowan]

Description.

Trees, unarmed. Stipules foliaceous, orbiculate to reniform. Leaves paripinnate; leaflets 2-4, opposite. Inflorescences in terminal paniculate racemes, 4-10 cm long; bracts and bracteoles small, caducous. Flowers radially symmetrical; hypanthium turbinate; sepals 5, free; petals 5, white, clawed; androecium monomorphic, stamens 10, free; pollen grains in monads, associated with viscin threads, coarsely reticulate; ovary stipitate, stigma disciform-peltate. Fruit a linear-oblanceolate, laterally compressed legume, elastically dehiscent, the woody valves coiling backwards from the apex at dehiscence, 4-5 (8)-seeded. Seeds ellipsoid-compressed.

Chromosome number.

Unknown.

Included species and geographic distribution.

Two species, A. emarginata R.S. Cowan and A. psilophylla , both occurring in eastern Brazil (Fig. 84 ).

Ecology.

The genus is only known from lowland Atlantic moist coastal forests on "tabuleiro terciário” of southern Bahia and northern Espírito Santo states in Brazil.

Etymology.

The generic name is derived from the local vernacular name “arapati”.

Human uses.

The species of the genus are used as timber for construction.

Notes.

Arapatiella is characterised by the foliaceous stipules, orbiculate to reniform, leaves paripinnate, and flowers radially symmetrical with turbinate hypanthium and ten exserted stamens. The fruits are elastically dehiscent from the apex, the woody valves coiling backwards at dehiscence. A taxonomic study of the genus, including a key to all species, was provided by Lima and Kuntz (2020).

Taxonomic references.

Cowan (1973, 1981b); Lewis (2005b); Lima et al. (2020a); Rizzini and Mattos (1972).

Figures

Figure 79. Vegetative morphology of Sclerolobieae A Moldenhawera nutans L. P. Queiroz, G. P. Lewis & Allkin shrubby individual in a Restinga sand dune field B Diptychandra aurantiaca (Mart.) Tul. tree in a Caatinga seasonally dry setting C Arapatiella psilophylla (Harms) R. S. Cowan flowering tree D Tachigali amplifolia (Ducke) Barneby large, buttressed tree E Jacqueshuberia purpurea Ducke pinnate stipule F leaf G detail of a leaf H Tachigali rugosa (Mart. ex Benth.) Zarucchi & Pipoly leaf with characteristic inversely symmetrical leaflets I, J Tachigali sp. details of leaf domatia K, L variation in stipule shape. Photo credits A, C, E-L D Cardoso B RT Queiroz https: // rubens-plantasdobrasil. blogspot. com / D I Huamantupa.

Figure 80. Floral morphology of Sclerolobieae A Moldenhawera lushnathiana Yakovlev highly branched inflorescence B Moldenhawera nutans L. P. Queiroz, G. P. Lewis & Allkin flowering branch, showing the typical navicular leaves with rust-coloured leaflet abaxial surface C flowers D Diptychandra aurantiaca (Mart.) Tul. flowering branch E inflorescence F Arapatiella psilophylla (Harms) R. S. Cowan inflorescences G flowers H Jacqueshuberia purpurea Ducke flower I Tachigali macrostachya Huber candelabrum-like inflorescences J Tachigali amarumayu Huamantupa, H. C. Lima & D. B. O. S. Cardoso densely paniculate inflorescences K Tachigali paraensis (Huber) Barneby radially symmetrical flowers L Tachigali paniculata Aubl. bilaterally symmetrical flowers M Tachigali macrostachya bilaterally symmetrical flowers. Photo credits A LP Queiroz B, C, F, G, I, K-M D Cardoso J I Huamantupa D, E RT Queiroz https: // rubens-plantasdobrasil. blogspot. com / H M Cohn-Haft.

Figure 81. Fruit morphology of Sclerolobieae A Moldenhawera polysperma (Vell.) Stellfeld old fruit valves B Diptychandra aurantiaca (Mart.) Tul. fruits C fruit opened showing the characteristic winged seed D Arapatiella psilophylla (Harms) R. S. Cowan immature fruit E Jacqueshuberia purpurea Ducke immature fruits F Tachigali macrostachya Huber immature fruits G Tachigali rugosa (Mart. ex Benth.) Zarucchi & Pipoly mature fruits. Photo credits A C Vivas B, C RT Queiroz https: // rubens-plantasdobrasil. blogspot. com / D-F D Cardoso G LP Queiroz.

Figure 84. Distribution of Arapatiella based on quality-controlled digitised herbarium records. See Suppl. material 1 for the source of occurrence data.