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So-called Opuntia candelabriformis and O. oligacantha are also in cultivation but the original descriptions indicate that these two species should be merged into O. spinulifera, and plants so determined in European collections support this view. In so far as we have been able to ascertain, no type specimens of any of the three supposed species are extant. Schumann (Gesamtb. Kakteen 740. 1898) describes the flowers of O. candelabriformis as purple, 6 to 7 cm. broad. Opuntia candelabriformis rigidior Salm-Dyck (Cact. Hort. Dyck. 1849. 68. 1850), an unpublished variety, may belong here.
Are large, and the majority of the seeds germinate (Weiss et al. 1994b). Their hybrids show a normal meiosis, with 11 bivalents at metaphase I, and produce pollen of high viability and seeds with high germination rates (Lichtenzveig et al. 2000). Pollen viability for S. megalanthus is significantly lower than that for Hylocereus spp. and is associated with the pairing of multivalents and consequently the occurrence of univalents at metaphase I, which leads to pollen or ovules with chromosomal disorders (Lichtenzveig et al. 2000). Selenicereus megalanthus crossed with Hylocereus hybrids are triploids, aneuploids, or polyploids with different chromosome numbers (N. Tel-Zur, S. Abbo, and Y. Mizrahi, unpublished observations). The ability to produce hybrids by interspecific and intergeneric crosses is utilized in Israel for breeding cultivars with desired fruit characteristics (such as improved taste) or greater environmental flexibility. Modern molecular techniques (Chapter 15) may...
The synonymy of this coastal species of Brazil is very complicated, for it has been confused with a Mexican species of uncertain relationship. An attempt is here made to account for the various names. Schumann took up the specific name exerens for it, basing it on Cereus exerens, an unpublished name of Link. Pilocereus arrabidae Lemaire seems to be the oldest definite name for the plant. This is not to be confused with Cereus arrabidae (Steudel, Nom. ed. 2. 1 333. 1840) as it has been in the Index Kewensis.
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