Abstract
Miconia rondoniensis occurs in secondary upland (terra firme) moist open forest in the Brazilian states of Rondonia, Mato Grosso and Amazonas. It can be recognized by the tree habit, large leaves with rounded to obtuse or subcordate bases and 5+2 basal veins (five main veins plus a faint submarginal pair), large inflorescences with proximal paraclades bearing quaternary branches and distal paraclades bearing tertiary branches, persistent hemi-elliptic bracteoles, short persistent calyx lobes, and capitate stigmas. The most striking feature of this new species is the thick pubescence on the branches and petioles, composed of trichomes having a long axis and short arms at the base, but inflated and lacking arms at the apex, resulting in a sorus-like surface covered with globose structures.
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