Bertolonia angustipetala 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 : 160-161

2. Bertolonia angustipetala Bacci & R. Goldenberg (in Bacci et al. 2018: 271). Figures 2b , 4 .

Herbs ca. 20 cm tall, terrestrial or epiphytic. Stem 2–3 mm wide, rounded, moderately glandulose-punctate (trichomes less than 0.1 mm long). Leaves opposite; petioles 1–2.2 cm long, quadrangular, moderately glandulose-punctate and sparsely glandulose-pilose (trichomes ca. 0.5 mm long); blades 3.9–8 × 1.8–3.7 cm, flat, elliptic, base rounded to shortly attenuate, apex acute, margins entire, sparsely ciliate, adaxial surface dark green, sparsely glandulose-punctate (trichomes less than 0.1 mm long, brownish), abaxial surface vinaceous, sparsely to moderately glandulose-punctate (trichomes less than 0.1 mm long, brownish), main veins 3, plus two pairs that do not reach the leaf apex, basal. Inflorescences terminal, 6–17 cm long (6.3–8.7 cm long in infructescences), branches sparsely to densely glandulosepunctate, sparsely glandulose-punctate when old. Bracts not seen; bracteoles ca. 1 mm long, narrow-lanceolate, apex acute, both surfaces glandulose-punctate. Hypanthium 4–5 × 3.5–4 mm, short-terete, glandulose-punctate and glandulose-villose. Sepals elliptic, apex rounded to acute, margins entire, ciliate, both surfaces glandulose-punctate and glandulose-villose. Petals 7–8.5 × 1.5–2 mm, light pink, linear-lanceolate, base slightly uncinate, apex apiculate, the apiculum ca. 1 mm long, with a caducous gland head, margins entire, eciliate, both surfaces papillose, otherwise glabrous. Stamens 7–8 mm long; filaments 3.5–4 mm long; anthers 3.5–4 mm long, cream colored, oblong-subulate, surface smooth undulate, pore rounded, non-thickened margins, introrse; connective shortly prolonged (ca. 0.5 mm), unappendaged. Style 5–7 mm long, straight or curved at the apex, glabrous. Fruits ca. 0.6 × 0.8 cm. Seeds reniform.

Examined material: — BRAZIL. Bahia: Wenceslau Guimarães, Bacci 26 7 ( UEC!); Goldenberg 20 77 ( HURB!, UPCB!); Jardim, J.G. 5040 ( CEPEC!, NY, UPCB!).

Conservation Status: — Bertolonia angustipetala has an EOO of 0.010 km ² and AOO of 0.035 km ², and should be classified as “Critically Endangered” (CR), following IUCN (2017) categories. This species has been collected only three times within the “Estação Ecológica Estadual Wenceslau Guimarães”.

Notes: — Bertolonia angustipetala is endemic to Bahia, occurring in montane rainforests ( Fig. 3b ). Collected with flowers in December and fruits in May and December. Bertolonia angustipetala is characterized by the small (3.9–8 × 1.8–3.7 cm) and elliptic leaf blades, these sparsely glandulose-punctate, and linear-lanceolate and apiculate petals. It shares with Bertolonia cuspidata Bacci & Amorim in Bacci et al. (2018: 772) the membranaceous, glandulosepunctate leaf blades with entire margins. However, Bertolonia angustipetala differs by the smaller leaf blades (3.9–8 × 1.8–3.7 cm) with an acute apex (vs. bigger leaf blades,7.3–12.2 × 3.9–6 cm, with a cuspidate apex in B. cuspidata ) and linear-lanceolate petals (vs. elliptic or obovate petals; Bacci et al. 2018). For more details, see notes under B. angustipetala in Bacci et al. (2018) and Table 1 .

Figures

FIGURE 2. Specimens in vivo. A. Bertolonia alternifolia. B. B. angustipetala. C. B. bullata. D. B. carmoi. E. B. cuspidata. F. B. hirsutissima. Photos:A, C, and E by A. M. A. Amorim; D by G. C. A. Bisewski; B and F by L. F. Bacci.

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 4. Bertolonia angustipetala. A. Fertile branch. B. Trichomes on the petiole. C. Leaf base, abaxial surface. D. Short-stalked glandular trichomes on the abaxial leaf surface. E. Leaf apex, abaxial surface [A, C, E: Jardim 5040; B, D: Goldenberg 2077].