a spreading, tropical American plant, Pilea microphylla, of the nettle family, having small, fleshy leaves and green flowers, grown as a curiosity because the pollen is discharged explosively when dry.
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British Dictionary definitions for artillery plant
any of various tropical urticaceous plants of the genus Pilea, such as P. microphylla, all having stamens that discharge their pollen explosively
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012