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Adj.1.umbelliform - resembling or in the form of an umbelumbelliform - resembling or in the form of an umbel
phytology, botany - the branch of biology that studies plants
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Umbel of spikelets (or sciadodium or umbelliform inflorescence): indeterminate inflorescence, with the spikelets disposed like the flowers of an umbel (Rua, 1999).