Abarema diamantina E.Guerra, Iganci & M.P.Morim

Guerra, Ethiéne, Soares, Marcos Vinicius Batista, Morim, Marli Pires & Iganci, João Ricardo Vieira, 2023, Circumscription of Abarema (Leguminosae, Caesalpinioideae, Mimosoid clade), Phytotaxa 601 (1), pp. 51-60 : 56-57

2. Abarema diamantina E.Guerra, Iganci & M.P.Morim in Phytotaxa 289 (1): 77. 2016.

Type:— BRASIL. Bahia: Morro do Chapéu, Estrada do Feij „o, trecho da estrada conhecido como Coreia, 9 a 10 km de Morro do Chapéu [ BA 052 ] km 259 até km 260, 11°35’44,18’’S 41°04’11,10’’W, 982 m elev., 21 March 2016, E. Guerra 149 (holotype ICN!, isotypes HUEFS!, RB!) .

Fig 4 and additional illustrations in Guerra et al. (2016).

Shrub 1–2.5 m. Stipules 0.5–1.5 mm long. Leaves with 1–4 pairs of pinnae; petiole 0.7–2.2 cm long; rachis 1.3–7 cm long; foliar nectaries on the rachis 1–1.4 mm diam., and on the rachillae of the pinnae 0.4 mm diam. Leaflets in 2–4 pairs per pinna, chartaceous and discolorous, light green on the adaxial surface, dark green on the abaxial surface, obovate to oblanceolate, the proximal leaflets (0.8–) 1.4–1.9 (–2.8) × (0.5–) 1–1.4 (–1.9) cm, the distal leaflets (2–) 2.7–3.7 (–4.2) × (1.2–) 1.9–2.3 (–2.5) cm, the apex rounded, sometimes emarginate, usually glabrous, sometimes puberulous on the primary vein of the abaxial surface, secondary veins prominent on both surfaces. Inflorescences peduncle 6.5–8.5 cm long; bracts not seen; bracteoles spatulate, 0.6 mm long, pubescent. Flowers sessile; calyx 2–2.5 mm long; corolla 4–6 mm long; stamens 1–1.3 cm, including a staminal tube 5.5–6 mm long, this exserted from the corolla; anthers 0.1 mm long; ovary puberulous, 1.3 mm long, truncate at the apex. Legumes 17–25 × 0.8–1.5 cm, apex acute. Seeds 7–8 × 5–6 mm, with a foveolate testa, mostly on the distal portion.

Distribution and habitat: — Abarema diamantina has a narrowly restricted geographical distribution, being endemic to the Chapada Diamantina, in Bahia state, at Caatinga biome.

Flowers and fruits information: —Flowers observed in December, old flowers observed in March, fruits observed from March to September.

Conservation status: —The species is currently considered to be Data Deficient (DD) according to the IUCN Red List Categories and Criteria (2022). Further research on the distribution, population sizes and threats to the species is needed to check the conservation status.

Notes: —Herbarium specimens of Abarema diamantina can be differentiated from A. cochliacarpos by their flowers (the staminal tube exserted from the corolla in A. diamantina vs. inserted in A. cochliacarpos ) and their seeds (the testa foveolate in A. diamantina vs. smooth in A. cochliacarpos ). Besides these differing reproductive characters, the two species can be distinguished in the field based on their habit (shrubby to 2.5 m tall in A. diamantina vs. a small to medium sized tree, 3–30 m tall in A. cochliacarpos ).

Selected material:— BRAZIL. Bahia: Morro do Chapéu, Distrito de Palmeiras , 11°55’S 41°15’W, 04.Dec.2002, M. E. R . Junqueira 169 ( HUEFS); Estrada do Feij „o, trecho da estrada conhecido como Coréia, 9 a 10 km de Morro do Chapéu [ BA 052 ] km 259 até km 260, 11°35’44,18’’S 41°04’11,10’’W, 982 m elev., 21.Mar.2016, E . Guerra 147; 148; 150 ( ICN); Estrada para Torre, 27.Apr.1999, R. C . Forzza, A. M . Amorim & S. C . de Sant’ana 1397 ( CEPEC, NY, RB, SPF); Serra Pé do Morro , 11°35’27S 41°12’24’’W, 1293 m elev., 29.Jun.1996, H. P . Bautista, N . Hind, A. M . Giulietti, R . Harley & S . Smith s.n. ( SPF 130982 ) .

Figures

FIGURE 4. Abarema diamantina E.Guerra, Iganci & M.P.Morim. A. habit; B. fruit; C. prominent venation on the leaflets. Photos: Guerra, E.