First description of extrafloral nectaries in Opuntia robusta (Cactaceae): Anatomy and ultrastructure
Fig 5
Scanning Electron Micrograph of extrafloral nectary spine.
(A) Whole modified spine; (B) Transition region between middle and apical secreting cone showing intercellular spaces and a broken cell; (C) Apical secreting cone; (D) Detail of the apex. asc—apical secreting cone; efn—extrafloral nectary; tr—trichome. (A)—(C)—hermaphrodite, (D)–feminine.