Inga bourgonii (Aubl.) DC., Prodr.

Fernandes, José Martins, Soares, Célia Regina Araújo, Koch, Ana Kelly, Duarte, Temilze Gomes & Almeida, Anderson Alex Sandro Domingos de, 2025, New records of the mimosoide clade (Caesalpinioideae, Leguminosae) for the state of Mato Grosso, Brazil, Rodriguesia (e 00312024) 76, pp. 1-11 : 3-6

1. Inga bourgonii (Aubl.) DC., Prodr. 2: 434. 1825.

Figs. 2 a-c; 3a-b

Trees, 9–15 m tall; young branches lenticellate, glabrous or glabrescent. Stipules 6–8 mm long, oblanceolate, caducous. Leaves pinnate; petiole 0.7–1.6 cm long, subcylindrical to marginate, 0–0.4 mm wide; rachis 4–9.5 cm long, marginate just below the leaflet pairs, 0.5–3 mm wide; nectaries sessile, patelliform, circular; leaflets in (2–)3 pairs; terminal leaflet pair 9–19.5 × 3.6–8.5 cm, narrowly elliptic, base asymmetric, apex shortly cuspidate; basal leaflet pair 4.8–12 × 2.2–5.5 cm, elliptic, ovate, rarely lanceolate, base asymmetric, apex shortly cuspidate; adaxial and abaxial surfaces glabrous. Inflorescences spiciform, axillary, 1–5; peduncle 1–2 cm long; rachis 2–3.5 cm long. Bracts 0.5–1 mm long, obtrullate, caducous. Flowers sessile to subsessile, 0–0.2 mm long; calyx tubular, sparsely short-sericeous, adpressed, tube 0.8–1.2 mm long, lobes 0.2–0.4 mm long, acute, irregular; corolla infundibuliform, glabrous to glabrescent, tube 3.6–4.2 mm long, lobes 0.5–1 mm long, acuminate, irregular; androecium tube 5–9 mm long, exerted, stamens 28–35, 4–7 mm long, white; nectary disc absent; gynoecium 1-carpellate; ovary 1.2–1.4 mm long, glabrous, style 9.1–15 mm long, stigma cylindrical. Fruit a nucoid legume, 12–20 × 2–3.2 cm, greenish, narrowly elliptic, glabrous, margins evident, surfaces open, transversally striate; seeds with abundant sarcotesta.

Examined material: Alta Floresta, Parque Zoobotânico Leopoldo Linhares Fernandes, 09°51’45”S, 56°04’24”W, 20.VIII.2022, fr., J. M.Fernandes 1902 ( HERBAM); 15. I.2023, fr., J. M. Fernandes 1939 ( HERBAM); 28.IV.2023, fl., J. M. Fernandes 1950 ( HERBAM); 8. V.2023, fl., J. M. Fernandes 1953 ( HERBAM). Cotriguaçu, Fazenda São Nicolau, 09°51’55”S, 58°15’59”W, 24.XI.2015, fr., J. P. Santos et al. 382 ( HERBAM).ParanaÍta, 09°22’59”S, 56°44’56”W, 19.IV.2012, fl., C. R. A. Soares et al. 6050 ( HERBAM).

This species has a distribution restricted to Amazonian forest and occurs from Colombia to the Guianas, as well as in Brazil, Ecuador, Peru, and Bolivia ( Pennington 1997). In Brazil, it had only been recorded in the North Region, in the sates of Acre, Amazonas, Amapá, Pará, Rondônia, and Roraima ( Pennington 1997; Garcia & Bonadeu 2024). The present work increases its distribution to the state of Mato Grosso, in the Central-West Region, in the municipalities of Alta Floresta, Cotriguaçu and ParanaÍta, in ombrophilous, várzia, gallery, and riparian forests ( Fig. 4 ).

Inga bourgonii is similar to I.pezizifera Bentham (1845: 587) but differs by the shorter petiole, winged leaf rachis, smaller foliar nectaries, and sessile flowers ( Pennington 1997).

Figures

Figure 2 – a-c. Inga bourgonii – a. leaf; b. inflorescences; c. fruit. d-e. I. duckei – d. leaf; e. fruit. f-h. Macrosamanea pubiramea var. pubiramea – f. habit; g. leaves; h. inflorescences. i-k. Piptadenia pteroclada – i. trunk with suberose wings and aculeus; j. leaf; k. fruits. (Photographs: a-g, i-k. J.M. Fernandes; h. A.K. Koch).

Figure 4 – Distribution of Inga bourgonii, I. cinnamomea, I. duckei Inga huberi, Macrosamanea pubiramea var. pubiramea and Piptadenia pteroclada in Mato Grosso.