is a specific kind of: plant order.

has as a member: family Xyridaceae, Xyridaceae, yellow-eyed grass family | Commelinaceae, family Commelinaceae, spiderwort family | Bromeliaceae, family Bromeliaceae, pineapple family | family Mayacaceae, Mayacaceae | family Rapateaceae, Rapateaceae | Eriocaulaceae, family Eriocaulaceae, pipewort family | family Pontederiaceae, pickerelweed family, Pontederiaceae.

is a member of: Commelinidae, subclass Commelinidae.