Marcgravia zonopunctata is described as a species new to science and illustrated. The species is remarkable for its hypophyllous glands arranged in bands on the lower leaf surface (not known before from Marcgravia), for its peculiar shape of the nectary bracts and for its inflorescences appearing on short-shoots (as far known). This is the first species of an unranked, obviously natural group within Marcgravia (Galeatae group) known to range in Amazonia and at low altitudes. Some features of this Galeatae group are discussed here (e.g. pollination, distribution, leaf anatomy) and a key to its species is given.
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