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An unusual new species of Eremocaulon, a Neotropical woody bamboo genus, is here described and illustrated. Eremocaulon triramis occurs in dense ombrophilous forest and is apparently endemic to Espírito Santo state, Brazil. The diameter and indument of the culms, number of branches in the branch complement, and occurrence of two different forms of fimbriae on the foliage leaves allow this taxon to be recognized as distinct from its congeners, even in the vegetative condition. Reproductively, E. triramis differs from its congeners in having laminiferous subtending bracts in the pseudospikelets and four stamens. Illustrations, photos, a detailed description, comments on morphology, habitat, distribution, and conservation status are provided, as well as a key to all species of Eremocaulon.

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Colanthelia is a woody bamboo genus belonging to the Arthrostylidiinae and currently includes nine species. It can be recognized by a suite of morphological characters including hollow and thick-walled culms, branch complement with a promontory in the base and a dominant divergent branch bearing few to many secondary small branchlets from its base, culm leaves with a relatively well developed girdle and a crest or skirt at the juncture of the sheath and girdle, racemose or weakly paniculate synflorescences, and relatively long and narrow spikelets with visible rachilla internodes. During recent fieldwork in Minas Gerais state, a new species, Colanthelia longipetiolata, from the Brazilian Atlantic forest was collected, which is here described and illustrated. So far as we know, the species is endemic to the Caparaó National Park, in Minas Gerais state. Comments on its habitat, distribution and conservation status, a morphological comparison between C. longipetiolata and C. sparsiflora, and a revised identification key to all species of the genus are provided.