Mammillaria


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Mammillaria

 

globular or short-cylindrical cacti. The stem is covered with tubercles that grow from the bases of the leaves. On top of the tubercles are areolae (adapted axillary buds), with tufts of hairs and thorns. The flowers and lateral shoots are borne in the axils of the tubercles. The flowers are usually small and grow in a wreath at the top of the stem. The fruits are berry like and ripen in the second year. There are more than 350 species (according to other sources, only about 200), found in the arid regions of Mexico, Venezuela, and Colombia. They grow on small hills or on mountains with elevations up to 2,800 m above sea level. Some species form large clumps. Many of these cacti are ornamentals; they are raised in greenhouses or as house plants. The plants are propagated from seeds and cuttings.

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He subdivided his Cereoideae (= Cactoideae) into three tribes: Echinocacteae, containing columnar and globular genera, such as Cephalocereus, Cereus, Echinocactus, Echinocereus, Echinopsis, Epiphyllum, Leuchtenbergia, Melocactus, Phyllocactus, and Pilocereus; Mammillarieae, currently Cacteae, with the genera Mammillaria and Pelecyphora; and Rhipsalideae, which grouped Hariota, Pfeiffera, and Rhipsalis.
Mammillaria bombycina se localizo en el suroeste en los municipios de Calvillo y Jesus Maria, siendo este ultimo tambien un lugar de donde no se habia reportado esta especie.
En comparacion, la capacidad de regeneracion in vitro reportada para Ariocarpus kotschoubeyanus fue de 6,3 brotes por explante (Moebius-Goldammer et al., 2003), para Notoeactus magnificus fue de 6,0 brotes por explante (de Medeiros et al., 2006) y en diez especies de Mammillaria, los valores oscilaron entre 2,4 y 17,4 brotes por explante (Ramirez-Malagon et al., 2007).
En este contexto, es recomendable poner atencion a la zona colindante con el Pinal del Zamorano, donde se han descrito taxa nuevos como Portulaca guanajuatensis, Mammillaria microhelia, M.
(2, 3, 4) JB g Lophophora diffusa 182, 200 Semidesierto (Croizat) Bravo (A) (1, 3, 4) JB Queretano Gc Mammillaria compressa 198 (3, 4) JB Desierto Chihuahuense subsp.compressa (Schum.) Borg.
Leirana-Alcocer J, Parra-Tabla V (1999) Factors affecting the distribution, abundance and seedling survival of Mammillaria gaumeri, an endemic cactus of coastal Yucatan, Mexico.