Bertolonia kollmannii Bacci & R.Goldenberg

Bisewski, Gessica C. A., Bacci, Lucas F., Amorim, André M. & Goldenberg, Renato, 2022, The Genus Bertolonia (Melastomataceae) In The State Of Bahia, Brazil, Phytotaxa 548 (2), pp. 153-183 : 169-170

8. Bertolonia kollmannii Bacci & R.Goldenberg (in Bacci et al. 2018: 775). Figure 11 .

Herbs 10–15 cm tall, rupiculous or terrestrial. Stem 1–2 mm wide, rounded, moderately to densely glandulose-punctate (trichomes less than 0.1 mm long) and sparsely to moderately glandulose-villose (trichomes 1.9–2.5 mm long). Leaves opposite; petioles 1–4 cm long, quadrangular, moderately glandulose-punctate and sparsely to moderately glandulose-villose (trichomes 1.2–1.7 mm long); blades 2.4–5.5 × 1.6–4.7 cm, bullate, ovate, base cordate, apex acute, margins crenate, moderately ciliate, adaxial surface green, sparsely to moderately glandulose-punctate and sparsely to moderately glandulose-villose (trichomes 2.5–2.8 mm long, brownish), abaxial surface vinaceous, sparsely to moderately glandulose-punctate and sparsely glandulose-villose (trichomes 0.6–1 mm long, brownish), main veins 3, plus one pair that do not reach the leaf apex, basal. Inflorescences terminal, pseudo-lateral when old, 4.9–6.1 cm long (5.3–9.1 cm long in old infructescences), branches sparsely glandulose-punctate and sparsely glandulose-villose, sparsely glandulose- punctate and sparsely glandulose-villose when old. Bracts 2–3.6 mm long, ovate, apex acute, margins ciliate, both surfaces glandulose-punctate and glandulose-villose; bracteoles 1–1.6 mm long, lanceolate, apex acute, both surfaces glandulose-punctate and glandulose-villose. Hypanthium 2.1–2.6 mm × 2.1–2.8 mm, short terete, glandulose-punctate and glandulose-villose. Sepals ovate, apex acute, margins fimbriate, ciliate, both surfaces glandulose-punctate and glandulose-villose. Petals 5.5–7 × 2.5–3 mm, pink, obovate, base cuneate, apex rounded, margins entire, eciliate, both surfaces papillose, otherwise glabrous. Stamens 3.2–4.7 mm long; filaments 1.4–2.3 mm long; anthers 1.9–2.4 mm long, cream colored, lanceolate, surface rugose or undulate, pore rounded, non-thickened margins, extrorse; connective prolonged (ca. 0.5 mm), dorsally bilobed. Style 3.4–5 mm long, slightly curved at the apex, glabrous. Fruits ca. 0.5 × 0.8 cm. Seeds reniform.

Examined material: — BRAZIL. Bahia: Macarani, Carvalho 6995 ( ALCB!, CEPEC!, HUEFS!, NY, UESC!, UPCB!).

Additional material: — BRAZIL. Minas Gerais: Santa Maria do Salto, Amorim 5548 ( CEPEC!, NY); Amorim 5845 ( CEPEC!); Thomas 14624 ( CEPEC!).

Conservation Status: — There are only two known populations of the species, but most specimens were found in “Fazenda Duas Barras” (Minas Gerais), an area of primary forest inside the “Parque Nacional Alto Cariri”. Bertolonia kollmannii has an EOO of 82 km ² and AOO of 201 km ², and should be classified as “Critically Endangered” (CR), following IUCN (2017) categories.

Notes: — Bertolonia kollmannii occurs in a restricted area along the border between the states of Bahia and Minas Gerais, in montane rainforests ( Fig. 3h ), in moist and shaded slopes near water. Collected with flowers in February and August, with fruits in February, April and August. The species can be recognized by the small, ovate and bullate leaf blades with an acute apex and crenate margins, flowers with fimbriate sepals, pink petals with the apex not apiculate and anthers dehiscing through an extrorse pore. Bertolonia kollmannii is similar to B. wurdackiana Baumgratz (1990: 125) , endemic of the state of Espírito Santo. Bertolonia kollmannii differs by the usually smaller leaf blades (2.4–5.5 × 1.6–4.7 cm) with an acute apex and crenate margins (vs. usually bigger leaf blades (5.8–15 × 3–8 cm) with an obtuse or rounded apex and serrate margins in B. wurdackiana ), by the pink, 5.5–7 mm long petals, with an obtuse apex (vs. white petals, 7.8–8.3 mm long, with an acute and dorsally apiculate apex) and cream-colored anthers dehiscing through an extrorse pore (vs. yellow anthers dehiscing through an introrse pore). For more details, see Bacci et al. (2018) and Table 1 .

Figures

FIGURE 3. Distributions of species of Bertolonia in Bahia.A. Bertolonia alternifolia. B. Bertolonia angustipetala. C. Bertolonia bullata. D. Bertolonia carmoi. E. Bertolonia cuspidata. F. Bertolonia hirsutissima. G. Bertolonia igrapiuna. H. Bertolonia kollmannii.

FIGURE 11. Bertolonia kollmannii. A. Fertile branch. B. Trichomes on the petiole. C. Leaf base, abaxial surface. D. Short and longstalked glandular trichomes on the abaxial leaf surface. E. Inflorescence. F. Hypanthium and calyx, abaxial surface. G. Petals apex. H. Stamen, dorsal (left) and lateral (right) views, note the extrorse pore on dorsal view. I. Ovary and style. [A, B, D, F, G, H, I: Amorim 5548; C, E: Carvalho 6995].