Taxonomic study of Myrtaceae in forest fragments in Amazonian Maranhão, Brazil Author Amorim, Gabriela Dos Santos Programa de Pós-graduação em Biologia Vegetal, Universidade Federal de Pernambuco, Av. Prof. Moraes Rego, 1235 - Cidade Universitária, 50670 - 901, Recife - PE, Brazil. Author Barbosa, Maria Regina De Vasconcellos Departamento de Sistemática e Ecologia, Universidade Federal da Paraíba, Cidade Universitária, Caixa Postal 5065, 58051 - 970, João Pessoa- PB, Brazil. Author Jr, Eduardo Bezerra De Almeida Departamento de Biologia, Universidade Federal do Maranhão, Cidade Universitária Dom Delgado, Av. dos Portugueses, 1966 - Vila Bacanga, 65080 - 805, São Luís - MA. Author Thomas, William Wayt 0000-0002-4996-536X Institute of Systematic Botany, New York Botanical Garden, 2900 Southern Boulevard, Bronx, 10458 - 5126, NY, United States. wthomas @ nybg. org; https: // orcid. org / 0000 - 0002 - 4996 - 536 X wthomas@nybg.org text Phytotaxa 2022 2022-10-11 568 1 27 60 http://dx.doi.org/10.11646/phytotaxa.568.1.3 journal article 163382 10.11646/phytotaxa.568.1.3 87ddb879-1616-4e3b-8817-434b61fb0c60 1179-3163 7184245 30. Myrcia selloi ( Spreng.) N. Silveira (in Mattos et al. 1986: 5 ). Basionym:— Myrtus selloi Sprengel (1825: 482) . Type:— BRAZIL . “ Brasilia ”, Sellow s.n. ( neotype designated by Lannoy et al. [2019 , p. 112]: K [000344138]). ( Figs. 5 K-L.) Shrubs 1.5– 3 m . Twigs sparsely pubescent or pubescent, the indumentum whitish. Leaves with petioles 2 mm long, pubescent, channeled; blades elliptic, lanceolate, oval or ovate, 3–10.2 × 1.2–5.1 cm , glabrescent, membranaceous, concolorous; glands conspicuous and dark abaxially; base cuneate or rounded; apex acute or acuminate; midvein adaxially flat; lateral veins visible and prominent abaxially, arched, 14 to 21 pairs; intra-marginal vein 3–4 mm from the margin, margin flat. Inflorescence terminal or subterminal, pyramidal panicle, flowers lax, the axis 3–4.3 cm long, puberulent, the indumentum whitish, the first branching 1.7–2.7 cm long; bracts lanceolate, 0.5 × 1 mm , glabrescent, caducous before anthesis; pedicels 2.5–3.5 mm long, glabrescent; bracteoles lanceolate, 0.5–1 × 1 mm , glabrescent, caducous before anthesis; flower buds globose or obovate, 1 × 3 mm , constricted above ovary; calyx-lobes free, five, triangular, 1 × 1 mm , glabrous, reflexed, persistent in the fruit; ovary 2-locular. Immature fruit globose, 0.3 × 0.5 cm , glabrous, surface with glands marked. Note:— Myrcia selloi may be recognized by its leaves with glands visible on both sides and dark abaxially; the globose or obovate flower buds constricted above ovary; and the reflexed calyx-lobes. This species is morphologically related to M . multiflora , from which it is distinguished by its abaxially prominent arched lateral veins (vs. flat and not arched), and reflexed calyx-lobes (vs. not reflexed). It is also morphologically related to M . tomentosa from which it is distinguished by its glabrescent and concolorous leaves (vs. glabrescent or sparsely pubescent adaxially and densely pubescent abaxially and discolorous), channeled petiole (vs. unchanneled), pedicellate flowers (vs. sessile flowers), and glabrous calyx-lobes (vs. pubescent). Distribution and habitat:— Known from northeastern Argentina , Bolivia , Paraguay and Uruguay and widely distributed in Brazil (POWO 2020, Flora do Brasil 2020 ). In Amazonian Maranhão , Myrcia selloi was found growing in secondary forests. Phenology:— Flowering in January and October and fruiting in January. Specimens examined:— BRAZIL . Maranhão : Gururupú , December 1957 (st.), R.L. Fróes 33998 ( IAN !) . São José de Ribamar , Sítio Aguahy , 2°38’48” S , 44°08’47” W , 28 October 2017 (fl.), G.S. Amorim 385 ( MAR !) . São Luís , Sítio Santa Eulália , 2°30’30” S , 44°16’39” W , 29 January 2018 (fr.), G.S. Amorim 421 ( MAR !) ; 2°30’21” S , 44°16’48” W , 11 January 1988 (fl.), R. Nina 3 ( SLUI !) ; 2°30’56” S , 44°16’37” W , 20 January 1988 (fl.), E. Barroso 46 ( SLUI !) ; Reserva da Caema , 2°34’30” S , 44°15’10” W , 15 January 1992 (fl.), J. Azevedo 11 ( SLUI !) . Palmeirândia , 2°38’43” S , 44°53’42” W , 07 January 2007 (fl.), C.M. Vieira 77 ( IAN !) .