Cephalocereus


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Cephalocereus

 

a genus of plants in the Cactaceae family. There is one species—the old-man cactus (C. senilis). The columnar and only slightly branched stem reaches 15 m in height and 30 cm in diameter. Lignification is insignificant. There are 20 to 30 ribs, bearing bundles of small spines and long white straight or curly hairs. Plants entering into the blooming phase form a special organ—the cephalium—a zone on the stem where, instead of ribs, low areoles with bundles of long bristles and hairs are formed. The bell mouth-shaped flowers developing on the cephalium are pinkish and unpleasant in odor; they open at night. The fruits are violet-red berries. The old-man cactus is native to Mexico. The plant grows well on steep limestone slopes in dry, hot valleys. The cactus is cultivated in botanical gardens and as an ornamental house-plant.

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Caricaceae) Nassau/New Providence January 12, 1932 Carica papaya Nassau/New Providence April 12, 1933 (b) Cephalocereus bahamensis North side of Crooked February Britton & Rose (Cactaceae) Island 20, 1933 [= Pilosocereus polygonus (Lam.
1886; Cephalocereus russelianus (Otto) Rose, Stand.
La vegetacion predominante en el area de estudio corresponde a las selvas bajas caducifolia y caducifolia espinosa, las especies arboreas mas abundantes son: Ceiba parvifolia, Fouqueria formosa, Bursera simaruba, Plumeria rubra y Lysiloma divaricata; ademas de los arboles, las formas basicas de estas selvas son los arbustos, lianas y hierbas, tambien se hallan cactaceas y plantas de formas arrosetadas que se encuentran representadas por especies de los generos Agave, Cephalocereus, Escontria, Pereskiopsis y Stenocereus (Torres-Colin 2004).
Cephalocereus columna-trajam Cardon blanco y viejito 1.
recurvata is found on Beaucarnea gracilis, and even on some columnar cacti as Cephalocereus columna-trajani and Neobuxbaumia tetetzp (Garcia-Suarez et al.
Old man cactus Cephalocereus senilis 59-75 Painted lady Echeveria derenbergii 45-65 Peanut cactus Chamaecereus 28-65 sylvestri Pincushion cactus Mammillaria spp.
Por otra parte, en el Cuadro 3 tambien se confirma una apreciacion visual hecha durante los recorridos regionales: Escontria chiotilla es mas importante en los sitios (TI) mas perturbados y Cephalocereus chrysacanthus lo es en (CU) los menos perturbados.
Otro cacto gigante es el "cabeza de viejo", Cephalocereus senilis de la region central del pais, de unos 15 metros de altura, que debe su nombre comun a los largos y abundantes filamentos blancos, asperos y cerdosos que lo cubren, especialmente en la parte superior.
In this paper, we advance the hypothesis that pseudocephalium orientation and stem tilting in Cephalocereus columna-trajani actually have functional advantages in terms of radiation interception compared with unbranched erect cacti with no pseudocephalium and tilted cacti with pseudocephalium orientations different from the observed one.