Nectarios extranupciales florales en especies de Bignoniaceae de Argentina

Abstract

"Extranuptial nectaries are found in almost all flowers of the studied species, and always on the calyx.Their shape varies from patelliform to cupuliform. Considering their anatomy, three groups of cells aredistinguished: (i) a secretory stratum of cylindrical, elongated cells, resting upon (ii) a layer or a singlebasal cell, and (iii) a reduced group of subepidermic cells. Based upon these characteristics, the termssimple and complex are proposed to describe extranuptial nectaries with one or with many basal cellsrespectively. This anatomic nectary feature is maintained within the level of species, thus becoming asignificant specific character. The two types of extranuptial nectaries can be found within a genus,constituting an important character to differentiate similar species"