Colleters in Cephalanthus (Rubiaceae) and reevaluation of occurrence of corolline colleters in Angiosperms.

Colleters are glandular structures related to young shoots protection. In several Angiosperm families, as in Rubiaceae colleters are taxonomically important. This study reports presence, location, morpho-anatomical structure, ontogeny and histochemistry of colleters in vegetative and reproductive organs in 6 species of Cephalanthus and 20 species representatives of the tribe Naucleeae.

Floral anatomy, embryology, seed, and fruit development in Cephalanthus (Naucleeae-Rubiaceae), with emphasis on C. glabratus.

Information on the reproductive anatomy in genera of the tribe Naucleeae, particularly Cephalanthus, is scarce and fragmented. Of the six species in the genus, only the mature megagamethophyte of Cephalanthus occidentalis has been described. This study aims to provide information on embryological aspects in flowers of C.

Morphological and molecular data confirm the transfer of homostylous species in the typically distylous genus (Rubiaceae), and the description of the new species from Peru and Colombia.

(Rubiaceae) is a neotropical genus comprising 50 species divided into two subgenera, subgen. with 39 species and subgen. , with 11 species.