Myrcia mansoniana O. Berg, Fl. Bras.

Rosário, Alessandro Silva, Baumgratz, José Fernando & Secco, Ricardo, 2017, Taxonomic studies of Myrcia (Myrciinae, Myrtaceae) in Brazil: morphological novelties, circumscriptions, and new records for the Amazon, Iheringia, Série Botânica 72 (2), pp. 165-172 : 167-168

Myrcia mansoniana O. Berg, Fl. Bras. 14(1): 163.

1857.

( Figs. 1 G, H )

This species is recorded here for the first time in the Brazilian Amazon, occurring only in Pará State and restricted to the Serra do Cachimbo where it occurs in terra firme (primary upland) forests and in submontane areas with rocky outcrops ( Rosário 2012). According to Sobral et al. (2012), this species is endemic to Brazil (Mato Grosso and Goiás States), with its center of distribution in the Cerrado biome. Thus, the species appears to have a disjunct distribution in two biomes with ecological conditions that favor its development ( Rosário 2012). Myrcia mansoniana is similar to M. mollis (Kunth) DC. , which can be primarily recognized by their velutinous vegetative and reproductive structures. However, M. mansoniana can be distinguished by having velutinous petioles on the young branches, and rusty trichomes on the peduncle, disc zone, and fruits (vs. sericeous-pubescent indument, with albescent to golden trichomes in M. mollis ). Despite not having been able to analyze material with buds and flowers, we infer that the pre-flowering is of the quincuncial type, as the sepals on the fruits partially overlap each other.

Specimens examined: BRAZIL. PARÁ: Itaituba, Serra do Cachimbo , Cachoeira de Curuá, north of the mountain slope, 05.XI.1977, fr ., G. T. Prance et al. 24882 (MG).

Myrcia ovata Cambess., Fl. Bras. Merid. 2: 319. 1832. ( Figs. 1 I, J )

According to Sobral et al. (2012), this species is endemic to the Atlantic Forest (in the states of Espírito Santo, São Paulo, and Rio de Janeiro), although it is cited here for the first time from Pará State and the Brazilian Amazon. It is found there as a subshrub to shrub in restinga environments (sandy coastal shrubby vegetation) and bordering secondary vegetation. Myrcia ovata distinguishes itself from other species of the genus by its subshrub or shrubby habit, distinctly oval leaves, glabrous, with marginal rib 2-4 mm distant from the margin, short petioles, canaliculated and glabrous flowers, with short pedicels (ca. 1 mm long). Rosário (2012) noted that many of the M. ovata collections deposited in the RB herbarium come from restinga environments in Rio de Janeiro State, which suggests that this is its preferred environment, although it is now known to have a disjunct distribution between the Amazon and Atlantic Forest biomes, indicating the states of Pará and Rio de Janeiro as distribution centers in their respective regions.

Specimens examined: BRAZIL. PARÁ: Tucuruí , BR-263, 03°30’S, 49°32’W, 28.X.1981, fl., D .C. Daly et al. 975 ( INPA, MG, NY); Maracanã, Ilha de Fortalezinha, XII.1999, fl ., L.C.B. Lobato et al. 2473 ( MG); ibid. loc., XII.1999, fl ., A.S. Rosário & L.C.B. Lobato 01 ( MG); Maracanã , Maiandeua, near the hole of Cambuinha, 20.IX.2007, fl ., A.S. Rosário et al. 34 ( MG); Maracanã , Maiandeua, near the hole of Cambuinha, 20.IX.2007, fr ., A.S. Rosário et al. 35 ( MG); Tomé-Açu, 1,500 m away from the Curiman Farm, 05. I.1978, bot., O.C. Nascimento

Figures

Figs. 1 A-J. A-C. Myrcia huallagae. A. Flowering branch; B. Flower, front view; C. Bract, showing adaxial side. D-F. Myrcia laruotteana. D. Flowering branch; E. Flower bud, showing calyx with valvate pre-flowering; F. Ovary 2-locular, cross-section.G, H. Myrcia mansoniana. G. Fruiting branch; H. Fruit, lateral view. I, J. Myrcia ovata. I. Flowering branch; J. Flower, showing valvate pre-flowering. (A-C. D. Mitja & D.C. Carvalho 10123; D-F. F. Lima s.n. (MG 10752); G, H. G.T. Prance et al. 24882; I, J. A.S. Rosário 01 & L.C.B. Lobato).