Distribution, growth, and reproduction of Pima pineapple cactus (Coryphantha scheeri Kuntz var robustispina Schott)
AdvisorHalvorson, William L.
MetadataShow full item record
PublisherThe University of Arizona.
RightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
AbstractPima pineapple cactus (Coryphantha scheeri var. robustispina) (PPC) is listed as endangered by the US Fish and Wildlife Service. This taxon occurs south of Tucson, Arizona and Sonora, Mexico. Knowledge of this plant's distribution, growth, and reproduction is important for management. Research has documented reduced plant vigor and lack of reproduction within Lehmann lovegrass stands. PPC density and seedling presence were described at five sites in two different vegetation types. Field observations of 72 plants at five sites were monitored from fall 1993 through summer of 95 and shadehouse studies were conducted. This research resulted in five conclusions: (1) fire-induced mortality of PPC may be related to Lehmann lovegrass, (2) PPC grows vegetatively in the spring, (3) flower buds are initiated in May and open after a few summer rains, (4) seed germination follows several summer rains, and (5) cross-pollination produces significantly more PPC seeds than self-pollination.
Degree ProgramGraduate College
Renewable Natural Resources