Boliviadendron E.R. Souza & C.E. Hughes, PhytoKeys 205: 445. 2022.

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

publication ID	https://dx.doi.org/10.3897/phytokeys.240.101716
persistent identifier	https://treatment.plazi.org/id/4ABB6204-6560-5AF6-DCFB-9CCF9005D123
treatment provided by	PhytoKeys by Pensoft
scientific name	Boliviadendron E.R. Souza & C.E. Hughes, PhytoKeys 205: 445. 2022.
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Treatment

Boliviadendron E.R. Souza & C.E. Hughes, PhytoKeys 205: 445. 2022. View in CoL

Figs 257 View Figure 257 , 258 View Figure 258 , 259 View Figure 259 , 260 View Figure 260 , 262 View Figure 262

Type.

Boliviadendron bolivianum (C.E. Hughes & Atahuachi) E.R. Souza & C.E. Hughes [≡ Leucochloron bolivianum C.E. Hughes & Atahuachi]

Description.

Small, unarmed multi-stemmed tree to 5-6 (10) m and 20-35 cm diameter with an irregular spreading crown; resting buds perulate, ovoid to 1.5 mm long and densely pilosulous (as for shoots), but these generally lacking. Stipules linear-triangular, caducous. Leaves bipinnate with 4-5 (6) pairs of pinnae, petiole with a circular or weakly ellipsoid cupular nectary at or slightly above mid-petiole position; similar smaller nectaries variably present between distal 1-2 pairs of pinnae or sometimes between all pinnae pairs; leaflets 15-20 pairs per pinna, slightly decrescent proximally and distally, linear-oblong, obliquely truncate at base, obtuse at apex, the tip sometimes acute, venation indistinct, palmate-pinnate brochidodromous, with 1-2 (weakly 3) primary veins at base, the main primary vein distinctly asymmetric, dividing the blade 1:2-2.5, giving rise on each side to 3-4 sinuous secondary veins, the first anterior or first pair of leaflets reduced to small paraphyllidia. Flowers white, sessile, homomorphic and arranged in lax globose capitula on slender peduncles, each capitulum with 20-25 flowers, the capitula immersed in new foliage, solitary or in fascicles of 2-3 in axils of coeval leaves; calyx narrowly campanulate, corolla tubular, slightly funnel-shaped; androecium of ca. 40 stamens, fused basally into a short tube that is not or hardly exserted beyond the corolla; pollen shed in 16-celled flat disk-shaped polyads; ovary sessile, the style held below anthers of the stamens. Fruit 1 per capitulum, sessile, (3) 4-6 (8)-seeded, flat plano-compressed, linear-oblong or oblong, obtuse at each end, sometimes with a short apiculum at apex, the valves straight or with slightly undulate margins, stiff papery, tardily dehiscent along both sutures. Seeds flat disciform, broadly suborbicular, the testa thin, lustrous, translucent castaneous, pleurogram lacking, surrounded by a narrow dark marginal nerve or minute wing.

Chromosome number.

Unknown.

Included species and geographic distribution.

Monospecific ( B. bolivianum ), endemic to Bolivia, where it is only known from the eastern flanks of the Andes at mid-elevations in interior Andean valleys in the Departments of La Paz, Cochabamba and Santa Cruz ( Souza et al. 2022a) (Fig. 262 View Figure 262 ).

Ecology.

Boliviadendron is known only from the slopes of interior valleys of Bolivia between 2150 and 2770 m elevation, around the transition from seasonally dry tropical inter-Andean valley forests to more moist mid-elevation montane Ceja de Monte Yungeña vegetation, where it is locally common in fence-lines, remnant patches of subhumid or seasonally dry Yungas forest and secondary thickets ( Souza et al. 2022a).

Etymology.

From ‘Bolivia’ and dendron (Greek = tree), named as such for the endemicity of the genus to the country Bolivia.

Human uses.

Unknown.

Notes.

The type species of Boliviadendron was first described as Leucochloron bolivianum C.E. Hughes & Atahuachi, but phylogenetic results of Koenen et al. (2020a), Ringelberg et al. (2022) and Souza et al. (2022a) have shown the non-monophyly of Leucochloron with this species placed separate from the rest of the genus and occurring instead within the Albizia clade of Koenen et al. (2020a). These results were unexpected because, in particular, the presence of perulate resting buds and a minute wing-like rim on the seeds of B. bolivianum suggested close affinity with the four species originally placed in Leucochloron by Barneby and Grimes (1996) and only a few morphological characters (weakly) separate Boliviadendron from Leucochloron ( Souza et al. 2022a). One of these features, however, the strongly asymmetrical leaflet base and 1-2 (3) primary veins of the leaflets are very similar to several (microphyllidinous) species of Albizia and Enterolobium , in line with its phylogenetic placement in the Albizia clade ( Koenen et al. 2020a; Ringelberg et al. 2022; Souza et al. 2022a). Without fruits, Boliviadendron is morphologically similar to, and easily confused with Enterolobium , but can be separated from that genus by its sessile as opposed to pedicellate flowers.