[ pə'fəʊlɪət ]
■ adjective Botany (of a stalkless leaf or bract) extended at the base to encircle the node (so that the stem appears to pass through it).
↘(of a plant) having such leaves.
Origin
C17: from mod. L. perfoliatus , from L. per- 'through' + foliatus 'leaved'.