Question: Peltandra and Cyrtanthus, are which type of entities?
Sentence (from "Queue (abstract data type)"): In computer science, a queue ( ) is a particular kind of abstract data type or collection in which the entities in the collection are kept in order and the principle (or only) operations on the collection are the addition of entities to the rear terminal position, known as "enqueue," and removal of entities from the front terminal position, known as "dequeue".
Relevant evidence: No