Morfología y anatomía del cefalio deCephalocereus senilis(Cactaceae)

[摘要] We study the morphology and anatomy ofCephalocereus senilis(Haw.) Pfeiff. flowering zone to describe and compare it with the information available for other species. We described in detail the vegetative and reproductive branches. Results show that there are morphological changes linked to anatomical ones after the flowering zone is differentiated. The flowering zone in this species is termed lateralcephaliumby its interareolar space reduction, areole size increment, and high production of long bristles and trichomes in the areoles. Moreover, periderm development near the apical meristem, lack of chlorenchyma and a delay in xylematic fibers differentiation are traits related with the lateral cephalium. The lateral cephalium ofC. senilisshows modifications previously reported for theEspostoaspecies with lateral cephalium, except for the presence of crystals in the trichomes, the addition of new ribs to the cephalium, and the growth in xylem and phloem parenchyma.

[学科分类] 植物学

[关键词] cacti;Cephalocereus;chlorenchyma;columnar habit;flowering zone;Hidalgo;lateral cephalium;paedomorphosis;periderm;pseudocephalium;viejito. cacti;Cephalocereus;chlorenchyma;columnar habit;flowering zone;Hidalgo;lateral cephalium;paedomorphosis;periderm;pseudocephalium;viejito