Haseltonia 20

    From the Editor 
    Root Gorelick

    Flowering phenology and observations on the pollination biology of South American cacti. 1. Denmoza rhodacantha
    Urs Eggli and Mario Giorgetta 

    Experimental evidence of reproductive isolation between Astrophytum coahuilense (H. Möller) Kayser and A. capricornevar. senile (Fric) Okumura (Cactaceae)
    Richard Montanucci

    Imperfect flowers of Opuntia fragilis in Kaladar, Ontario
    Yaseen Mottiar, Paul D.J. Chafe, and Eric Ribbens 

    Karyotypes, heterochromatin and physical mapping of rDNA in vine Cactaceae (Hylocereinae)
    Natalia Cecilia Moreno, M.A. Laura Las Peñas, and G. Bernardello 

    Mescaline concentrations in three principal tissues of Lophophora williamsii (Cactaceae): Implications for sustainable harvesting practices
    Molly T. Klein, M. Kalam, Keeper Trout, Norma Fowler, and Martin Terry

    Effect of culture conditions on stomatal density and stomatal index in four cactus species
    Virginia Herrera-Martínez, Luis Rios-Hernández, Cristina Garcidueñas-Piña, Aldo Lara-Ibarra, Araceli Adabache-Ortiz, Ruth Elena Soria-Guerra, Eugenio Pérez-Molphe-Balch, and José Francisco Morales-Domínguez

    Why vegetative propagation of leaf cuttings is possible in succulent and semi-succulent plants
    Root Gorelick

    Sedum piaxtlaense (Crassulaceae), a new species from Durango, México
    Jerónimo Reyes Santiago, Julia Etter, and Martin Kristen

    Gentry revisited: the agaves of Baja California, México
    Robert H. Webb and Greg Starr

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