Noun | 1. | ![]() liliopsid genus, monocot genus - genus of flowering plants having a single cotyledon (embryonic leaf) in the seed hardstem bulrush, hardstemmed bulrush, Scirpus acutus - widely distributed North American sedge having rigid olive green stems Scirpus cyperinus, wool grass - sedge of eastern North America having numerous clustered woolly spikelets |