spiraperturate
adj- […] (spiraperturate pollen grains). Spiraperturate pollen grains are found in some liliopsids, such as Lomandra, Aphyllanthes , and Eriocaulaceae. A modified type of the spiraperturate pollen grain is observed in Baxteria[…]1991, Armen Leonovich Takhtadzhi͡an, Evolutionary Trends in Flowering Plants, Columbia University Press, →ISBN, page 149: