• Cacti in the Living Plant Collection of the Boyce Thompson Southwestern Arboretum

      Newland, Kent C.; Crosswhite, Frank S.; Boyce Thompson Southwestern Arboretum (University of Arizona (Tucson, AZ), 1985)
    • Californian (Coastal) Chaparral

      Pase, Charles P.; USDA Forest Service (University of Arizona (Tucson, AZ), 1982)
    • Californian Coastalscrub

      Pase, Charles P.; Brown, David E.; USDA Forest Service; Arizona Game and Fish Department (University of Arizona (Tucson, AZ), 1982)
    • Californian Evergreen Forest and Woodland

      Brown, David E.; Arizona Game and Fish Department (University of Arizona (Tucson, AZ), 1982)
    • Californian Maritime and Interior Marshlands

      Minckley, W. L.; Brown, David E.; Department of Zoology, Arizona State University; Arizona Game and Fish Department (University of Arizona (Tucson, AZ), 1982)
    • Californian Maritime Strands

      Minckley, W. L.; Brown, David E.; Department of Zoology, Arizona State University; Arizona Game and Fish Department (University of Arizona (Tucson, AZ), 1982)
    • Californian Valley Grassland

      Brown, David E.; Arizona Game and Fish Department (University of Arizona (Tucson, AZ), 1982)
    • The Canary Islands: Continents in Miniature, Lands of Myth

      Petrie, Jeffrey M. (University of Arizona (Tucson, AZ), 2008-06)
    • Carbon Dioxide Exchange Processes in Jojoba

      Glat, Daniel; Dobrenz, A. K.; Palzkill, D.; Department of Plant Sciences, University of Arizona (University of Arizona (Tucson, AZ), 1983)
    • A Career of Her Own: Edith Shreve at the Desert Laboratory

      Bowers, Janice E. (University of Arizona (Tucson, AZ), 1986)
    • Catastrophic Freezes in the Sonoran Desert

      Bowers, Janice E.; Office of Arid Lands Studies, University of Arizona (University of Arizona (Tucson, AZ), 1981)
    • Chihuahuan Desertscrub

      Brown, David E.; Arizona Game and Fish Department (University of Arizona (Tucson, AZ), 1982)
    • Chollas, Circles and Seris: Did Seri Indians Plant Cactus at Circle 6

      Bowen, Thomas; Felger, Richard S.; Hills, R. James; The Southwest Center, University of Arizona; Drylands Institute; Arizona-Sonora Desert Museum (University of Arizona (Tucson, AZ), 2004-12)
      On November 26, 1966, during an archaeological survey, one of us (Bowen) and Stephen D. Hayden discovered a circle of stones on Punta Santa Rosa, a prominent point of land on the coast of mainland Sonora, Mexico (Figure 1 ). This in itself was not remarkable because they had encountered other circles previously. What was noteworthy was that this particular circle was surrounded by a ring of small jumping cholla cacti (Cylindropuntia fulgida var. fulgida) that seemed obviously planted. Punta Santa Rosa lies within the historic territory of the Seri (or Comcaac) Indians, and Bowen and Hayden knew that the Seris had used stone circles as part of the traditional vision quest. But since the Seris were considered a nonagricultural hunting-gathering-fishing people, the association of a presumably Seri circle with cacti that appeared intentionally planted seemed incongruous. At that time, however, Bowen and Hayden did nothing more with this odd feature than photograph it, give it the prosaic designation "Circle 6", and pass it off in an archaeological report as probably just an unusual Seri vision ring (Bowen 1976: 40). They did not anticipate that Circle 6 would continue to pose an ethnobotanical puzzle and one day provide an object lesson in archaeological interpretation. But puzzle it was. In this paper we reexamine Circle 6 in light of the known history of Seri planting. We consider several hypotheses, some of them proposed by modern Seris, about the circle's age, cultural identity, and function. We conclude that the original interpretation of Circle 6 as a vision ring is incorrect but that the peculiar cholla ring most likely does constitute a case of purposeful Seri planting.
    • Chromosome and Hybridization Studies of Agave

      Pinkava, Donald J.; Baker, Mark A.; Department of Botany and Microbiology, Arizona State University (University of Arizona (Tucson, AZ), 1985)
      Interspecific hybridization, paleopolyploidy, secondary polyploidy, and vegetative reproduction appear to play significant roles in the evolution of Agave and certain related genera. First chromosome counts are reported for Hesperaloe funifera and 10 taxa of Agave including two triploid and one diploid putative hybrids. All of our counts for Yucca, Hesperaloe, and Agave are in agreement with the base number, x = 30, which comprises a complement of five very large chromosomes and 25 medium to small chromosomes. All published chromosome counts of Agave have been tabulated and the roles of hybridization and polyploidy are assessed. Secondary polyploidy occurs in 26 of 48 (54.2 %) reported taxa of Agave; as yet only one-fourth of the total taxa are chromosomally known.
    • Chrysothamnus nauseosus (Rubber Rabbitbrush): Multiple-Use Shrub of the Desert

      Weber, D. J.; Davis, T. D.; McArthur, E. D.; Sankhla, N.; Brigham Young University; U.S.D.A. Forest Service; University of Jodhpur (University of Arizona (Tucson, AZ), 1985)
      Rubber Rabbitbrush (Chrysothamnus nauseosus), a common desert shrub native to the western United States, grows over a wide range of environmental conditions from Mexico to Canada. Rabbitbrush grows well in disturbed sites and can grow in saline soils. It has a high rate of net photosynthesis for a woody C3 plant and does not become light saturated at full sun. The many current and potential uses for the shrub include forage value for wildlife and livestock, landscape use, production of natural rubber, potential hydrocarbon crop, and potential source of natural insecticides and fungicides. Its potential has not been fully recognized.
    • A Classification of Life Forms of the Sonoran Desert, With Emphasis on the Seed Plants and Their Survival Strategies

      Crosswhite, Frank S.; Crosswhite, Carol D.; Boyce Thompson Southwestern Arboretum (University of Arizona (Tucson, AZ), 1984)
      Taxonomists have published large numbers of scientific articles, monographs and books attempting to classify the creatures which live on earth. Paradoxically, although form (morphology) has been the criterion most widely used by taxonomists to separate the various types of life (creatures) one from the other to produce classification schemes, relatively little attention has been devoted to classifying "life forms" per se. Perhaps this has resulted from a tendency to emphasize phylogenetic reconstruction in preference to the importance of form in relation to function in life. Indeed taxonomists have traditionally studied preserved (dead) specimens from which it can be notoriously difficult to make interpretations relating to functional adaptations. The classification of life forms is only superficially taxonomic. To classify them it is necessary to understand them. To understand them we need to know about their physiological ecology.
    • A Climatologic Summary for Punta Cirio, Sonora, Mexico

      Humphrey, Robert R.; Department of Ecology and Evolutionary Biology, University of Arizona (University of Arizona (Tucson, AZ), 1981)
      Climatological data have been collected at several stations in the general vicinity of Puerto Libertád, Sonora, Mexico at various intervals from 1925 to the present. The general area is a focal point for both research and teaching activities. For this reason and because the Sonoran Desert coastal climate is distinct from that of other portions of this desert, the data from these stations are here summarized and discussed. They are presented here primarily to make them available to future students of the area.
    • Cold Temperate Grasslands

      Brown, David E.; Makings, Elizabeth; Arizona State University (University of Arizona (Tucson, AZ), 2014-01)
    • Colonel William Boyce Thompson

      Smith, William T.; Boyce Thompson Southwestern Arboretum (University of Arizona (Tucson, AZ), 1982-06)
    • Conservation of Southwestern Agaves

      Reichenbacher, Frank W.; F. W. Reichenbacher & Associates (University of Arizona (Tucson, AZ), 1985)
      The status of Southwestern agaves being considered for listing under the 1973 Endangered Species Act are summarized. Numerous Mexican agaves appear to merit consideration for listing as threatened or endangered species. An outline of action to accomplish this and achieve some much-needed communication between the United States and Mexico is presented. The agaves are clearly of Mexican origin. Species abundance contour maps are used to locate areas and species of special significance in the study of the evolution of the genus and to map out a conservation plan for the genus.