Inga huberi Ducke, Arch. Jard. Bot.

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 : 7-8

4. Inga huberi Ducke, Arch. Jard. Bot. Rio de Janeiro 3: 49. 1922. Fig. 3 j-n

Trees, 5–20 m tall; young branches cylindrical to subcylindrical, leticellate, puberulent and short-sericeous. Stipules 2.5–3.7 mm long, lanceolate to oblanceolate, puberulent, caducous. Leaves pinnate; petiole 1.6–4 cm long, cylindrical; rachis (0–)3.5–6(–10) cm long, cylindrical; nectaries sessile, discoid, circular; leaflets in (1–)2(–3) pairs; terminal leaflet pair 11.5–19 × 4.8–10.2 cm, oblanceolate, rarely elliptic, base acute, apex shortly cuspidate; basal leaflet pair 7–14 × 3–7.2 cm, ovate to elliptic, base asymmetric, apex shortly cuspidate; adaxial surface glabrous, abaxial surface with sparse glandular trichomes. Inflorescences umbelliform, globose, axillary, 1–2, or grouped; peduncle 2.6–6 cm long; rachis 3–4 mm long. Bracts 0.8–1 × 0.2–1.4 mm, ovate to flabelliform, caducous. Flowers pedicellate, pedicel 0.6–1.3 mm long; calyx tubuliform, (0.8–) 1–2 mm long, lobes 0.1–0.3 mm long, irregular, puberulous at the apex; corolla infundibuliform, whitish, glabrous, tube 4.5–6.3 mm long, lobes 1 mm long; androecium tube 5–7.8 mm long, exerted, stamens 30–52, 10–14 mm long, whitish; nectary disc absent; gynoecium 1-carpellate; ovary 1.7–2 mm long, glabrous, style 7.8–12.5 mm long, stigma cylindrical. Fruit a nucoid legume, 12–36 × 2.8–4.6 cm, linear, rarely narrowly oblong, turgid when mature, margins not expanded, transversal veins evident, irregular, glabrous; seeds 7–14, sarcotesta abundant.

Examined material: Alta Floresta, Assentamento Jacamim, propriedade do Sr. Pedro, 11.VII.2018, fr., S. E.X. F Souza 966 ( HERBAM); sÍtio do Sr. Braz da Silva , fl., S. E.X. F. Souza 1036 ( HERBAM); casa de sementes Ouro Verde , comunidade Estrela do Sul, 9.VIII.2014, fr., L. Rodrigues 567 ( HERBAM). ColÍder , resgate de flora da Usina Hidrelétrica ColÍder, lote B de supressão, 4.VIII.2015, fr., L. F Sardelli 706 ( HERBAM); Casa de Sementes ColÍder , 10°30’45”S, 55°27’16”W, 20.X.2015, fr., L. Rodrigues et al. 951 ( HERBAM). Itaúba , resgate de flora da Usina Hidrelétrica ColÍder, lote F, 11. VI.2015, fl., R. C. Santos et al. 24 ( HERBAM). Nova Canaã do Norte, resgate de flora da Usina Hidrelétrica ColÍder, lote A de supressão, 26.IX.2014, fr., M. A. S. Zanin et al. ( HERBAM 14326 ); casa de sementes Veraneio, 10°46’31”S, 55°43’08”W, 28.VII.2014, fr., L. Rodrigues et al. 539 ( HERBAM). ParanaÍta, rodovia MT-208, próximo ao restaurante do Baiano, 09°55’07”S, 56°35’25”W, 14.VIII.2018, fr., J. A. M. Melo 261 ( HERBAM) .

This species is restricted to Brazil, Guyana, Fr e nc h Gu i a n a, Su r i n a me, a nd Ve ne z uel a ( Pennington 1997).Here, we increase its distribution to Mato Grosso where it occurs in the municipalities of Alta Floresta, ColÍder, Itaúba, Nova Canaã do Norte and ParanaÍta in areas of pasture, Planalto dos Parecis forest, and secondary forest ( Fig. 4 ).

Inga huberi has a flower structure similar to that of I. glomeriflora Ducke (1922: 50) but differs by the leaves with 2 pairs of leaflets, generally grouped inflorescence, and woody fruits with verrucose transverse veins, while I. glomeriflora has leaves with 3–4 pairs of leaflets, inflorescences grouped in small protuberances, and fruits with smooth surfaces ( Pennington 1997).

Figures

Figure 3 – a-b. Inga bourgonii – a. leaf nectary; b. flower. c-e. I. cinnamomea – c. branch with leaf and inflorescences; d. leaf nectary; e. flower. f-i. I. duckei – f-g. leaf nectaries; h. inflorescences; i. flower. j-n. I. huberi – j. leaf; k. leaf nectary; l. inflorescence; m. flower; n. fruit. (a-b. Fernandes 1950; c-e. Engels & Bezerra 4483; f-g. Fernandes 2052; h-i. Soares et al. 1329; j-m. Souza & Felito 1036; n. Zanin et al. 1182).

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