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
10.11646/phytotaxa.568.1.3
87ddb879-1616-4e3b-8817-434b61fb0c60
1179-3163
7184245
21.
Myrcia eximia
De Candolle (1828: 248)
.
Type:—
BRAZIL
.
Minas Gerais
, “in
Brasiliae deserto ad Minas Geraes
”
C.F.P. Martius
s.n.
(
holotype
:
M
[0136862])
. (
Figs. 5
E-F)
Trees
5 m
.
Twigs glabrescent or sparsely pubescent, the indumentum yellowish. Leaves with petioles
4–7 mm
long, pubescent, channeled; blades elliptic, oblong or oval, 7–11.1 ×
2.8–5.2 cm
, pubescent, the indumentum whitish, chartaceous, concolorous; glands conspicuous; base cuneate or rounded; apex acuminate or long acuminate; midvein adaxially sulcate; lateral veins visible and strongly marked, not arched, 12 to 16 pairs; intra-marginal vein
1–2 mm
from the margin,margin revolute. Inflorescence terminal or subterminal, panicle, pyramidal, sometimes two per axis, flowers lax, the axis
7–11.1 cm
long, pubescent, the indumentum whitish, the first branching
1–6.5 cm
; bracts not seen, caducous before anthesis; pedicels ca.
0.5 mm
long or absent, glabrous; bracteoles lanceolate, 1.5 ×
0.5 mm
, glabrous, caducous after anthesis; flower buds globose, 2 ×
3 mm
, not constricted above ovary; calyx-lobes free, five, orbicular 0.5–1 ×
0.5–1.5 mm
, glabrous, not reflexed, persistent in the fruit; ovary 2-locular. Immature fruit globose or ellipsoid, 0.8–1 ×
0.6–1.2 cm
, glabrous, surface smooth.
Note:—
Myrcia eximia
may be recognized by its elliptic, oblong or oval leaves, which are pubescent with whitish indumentum; the visible lateral veins, which are strongly marked; and the pubescent panicle. This species is morphologically related to
M
.
splendens
from which it is distinguished by its sulcate adaxially midvein (vs. impressed), and the lateral veins that are strongly marked adaxially and abaxially (vs. not marked).
Distribution and habitat:—
Known from central and northeastern
Brazil
(
Bahia
,
Goiás
,
Maranhão
,
Mato Grosso
,
Minas Gerais
and
Piauí
states) (POWO 2020,
Flora do
Brasil
2020
). In Amazonian
Maranhão
,
M.
eximia
was found growing in “terra firme” forest.
Phenology:—
Flowering in February.
Specimens examined:—
BRAZIL
.
Maranhão
:
Cândido Mendes
,
Fazenda
7 irmãos,
2°26’31” S
,
46°18’07” W
,
16 February 2020
(fl.),
G.S. Amorim
619
(
JPB
!)
.
Additional specimens examined:—
BRAZIL
. Pará. Altamira: Sete Palmeiras,
3°12’12” S
,
52°12’23” W
,
12 December 1986
(fr.),
S. M.
Athie de Souza
,
O. Nascimento
,
M. Santos
&
J.C. Santos
673
(US, image)
; Salvaterra, Condeixas,
0°45’12” S
,
48°31’00” W
,
10 January 1982
(fl.),
C.S. Rosáro & E. Taylor 124
(MBM, image). Piaui. Uruçuí, estrada Waldemar Bertozzolo,
7°13’46” S
,
44°33’22” W
,
19 November 2005
(fl.),
A.M. Miranda 5222
(HUEFS, image).