Cereus

In contrast, species in the different genera of columnar cacti may reproduce in autumn/winter (Cereus, Myrtillocactus, Pachycereus, Pilosocereus, Selenicereus, Stenocereus) or spring/summer (Carnegiea, Cephalocereus, Escontria, Hylocereus, Lophocereus, Neobuxbaumia, Pachycereus, Pilosocereus, Polaskia, Stenocereus, Subpilocereus), and their reproductive periods last for 2 to 4 months (Steenbergh & Lowe, 1977; Weiss et al., 1994; Valiente-Banuet et al., 1996, 1997a, 1997b; Nassar et al., 1997; Casas et al., 1999; Rojas-Martinez et al., 1999; Ruiz et al., 2000; Fleming et al., 2001; Esparza-Olguin et al., 2002).

The number of empty and full pollen grains observed in the fecal samples were corrected using the amount of aborted pollens present (before anthesis) in flowers of the columnar cacti species (Subpilocereus repandus, Stenocereus griseus and Pilosocereus tillianus) used by bats as food in the study site; G.

La sincronia entre la apertura de la flor y la dehiscencia de las anteras tambien fue observada en cactaceas columnares venezolanas como Stenocereus griceus, Pilosocerus moritzianus, Subpilocereus repandus y Subpilocerus horripinis (Nassar et al.