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Geonoma (family Palmae) A genus of small, sometimes minute, abundant undergrowth palms, many of which form clumps. The leaves are pinnately nerved, simple, or divided into broad or narrow leaflets. The palms are monoecious. The inflorescence is branched or simple. Geonomas are little known in cultivation. There are 75 species, found in lowland and mountain forests of tropical America.