Fig. 4.

(A) Paired hollow nectarial glands of Conocarpus erectus showing petiolar position. Scale bar = 500 µm. (B) Detail of the surface slit (pore) of one of the hollow petiolar nectaries of Ipomoea pes-caprae; few scale-like trichomes surround the cavity. Scale bar = 500 µm. (C) Cup-shaped elevated nectary of Chamaecrista chamaecristoides with a stalked on the petiole or rachis of the compound leaf. Scale bar = 200 µm. (D) One of the paired petiolar elevated nectaries of Turnera ulmifolia showing central swelling due to nectar accumulation beneath the cuticle. Scale bar = 100 µm. (E) Single elevated nectary of Senna occidentalis with a stalk on the petiole or rachis showing apical swelling due to nectar accumulation under the cuticle. Scale bar = 200 µm. (F) Lateral view of a nectary of Acacia cornigera showing its elevation. Scale bar = 500 µm.