Perianth

Perianth, a convenient general term for the floral envelopes [Flower], employed more especially when there is either only one whorl of them (monochlamydeous) or two whorls of similar texture, as in many Monocotyledons. It may thus be petaloid in colour and texture, as in lilies, tulips, Narcissus, etc.; herbaceous, as in nettles.; or glumaceous, as in rushes; and either gantophyllous, with united leaves, as in hyacinth; or polypligllous, when they are free, as in lilies.