• Interior Strands

      Minckley, W. L.; Brown, David E.; Department of Zoology, Arizona State University; Arizona Game and Fish Department (University of Arizona (Tucson, AZ), 1982)
    • Intriguing Chihuahuan Desert Yuccas in Cultivation

      Starr, Greg (University of Arizona (Tucson, AZ), 2015-05-20)
    • Introduction

      Lowe, Charles H.; Brown, David E.; Department of Ecology and Evolutionary Biology, University of Arizona; Arizona Game and Fish Department (University of Arizona (Tucson, AZ), 1982)
    • Introduction to the Symposium

      Gentry, Howard Scott; Desert Botanical Garden (University of Arizona (Tucson, AZ), 1985)
    • Is Your Landscape Threatening the Desert?

      Tellman, Barbara (University of Arizona (Tucson, AZ), 2002-12)
    • 'J. G. Lemmon & Wife,' Plant Explorers in Arizona, California, and Nevada

      Crosswhite, Frank S.; Boyce Thompson Southwestern Arboretum; Department of Plant Sciences, University of Arizona (University of Arizona (Tucson, AZ), 1979-08)
    • Jatropha (Euphorbiaceae) in Southwestern United States and Adjacent Northern Mexico

      Johnson, Matthew B.; Desert Legume Program, The University of Arizona (University of Arizona (Tucson, AZ), 1998-12)
    • John C. Fremont: Explorer, Plant Collector and Politician

      Crosswhite, Frank S.; Boyce Thompson Southwestern Arboretum (University of Arizona (Tucson, AZ), 1984)
    • Karoo Desert National Botanical Garden

      Oliver, Ian; Karoo Botanical Garden (University of Arizona (Tucson, AZ), 2003-06)
    • Land Fraud and Nutgalls

      University of Arizona (Tucson, AZ), 1981
    • Landscape Plants Persistence at Williams AFB

      Carter, Steven J.; Feldman, William R.; Boyce Thompson Southwestern Arboretum (University of Arizona (Tucson, AZ), 2015-05-20)
    • Landscape Water Use in Phoenix, Arizona

      Martin, Chris A.; Urban Horticulture Ecology Research Laboratory, Department of Plant Biology, Arizona State University (University of Arizona (Tucson, AZ), 2015-05-20)
    • Landscaping for Energy Conservation

      Yoklic, Martin R. (University of Arizona (Tucson, AZ), 1982-01)
    • Large Woody Debris in Hot-Desert Streams: An Historical Perspective

      Minckley, W. L.; Rinne, John N.; Arizona State University; Rocky Mountain Forest and Range Experiment Station, USDA Forest Service (University of Arizona (Tucson, AZ), 1985)
      Large-particulate organic debris is denied to present-day desert streams because of interception by impoundments and as a result of decimation of formerly extensive riparian vegetation. Historical records indicate a substantial, but sporadic, input of coarse debris, which was reduced to finer particles through molar action in canyon-bound reaches of desert rivers. Historical changes, functions of large debris in the systems, and probable future conditions are reviewed.
    • Late 19th Century Human Impacts on the Woodlands and Forests of Southeastern Arizona's Sky Islands

      Bahre, Conrad J.; Department of Land, Air and Water Resources, University of California, Davis (University of Arizona (Tucson, AZ), 1998-06)
    • Leaf Unfolding Rates and Responses to Cuticle Damaging for Pulque Agaves in Mexico

      García-Moya, Edmundo; Nobel, Park S.; Colegio de Postraduados; University of California (University of Arizona (Tucson, AZ), 1990)
      Agave mapisaga and A. salmiana, which are widely cultivated in central Mexico for the fermented beverage pulque, have 7 to 11 leaves unfolding annually per plant. Such leaves can be 2 m in length with dry weights exceeding 1 kg, leading to estimated aboveground productivities of 25 to 26 metric tons ha⁻¹ yr⁻¹. To prevent theft of the cuticle from folded leaves of A. salmiana, which is used to wrap meat for steam cooking (termed "mixiote"), the distal one-third of the central spike of folded leaves is often intentionally cut off, which unfortunately depresses leaf unfolding for the next two years. However, making small holes in the central spike, which also renders the cuticle unusable for mixiote, does not significantly reduce the rate of leaf unfolding.
    • Leucaena - Rhizobium Compatability and Nitrogen Fixation

      Thoma, Paul E.; Botany Department, University of Wisconsin-Milwaukee (University of Arizona (Tucson, AZ), 1983)
      The compatibility and effectiveness of potentially nitrogen fixing associations between two Rhizobium strains and thirteen collections of Leucaena leucocephala, five other species of Leucaena, and Albizia occidentalis were determined. The appearance, dry weight, and nitrogen content of plants grown with and without Rhizobium were determined. A comparison was made of nitrogen fixed per plant and per unit weight of plant, and the ratio of plant weight (grown with Rhizobium) to plant weight (grown without Rhizobium). The various collections of L. leucocephala made compatible and equally effective nitrogen fixing associations with the two strains of Rhizobium. Compatible and effective nitrogen fixing associations also occurred with L. pulverulenta, L. esculenta, L. diversifolia, and L. collinsii. Less effective nitrogen fixing associations occurred with L. retusa. Although root nodules formed on A. occidentalis, effective nitrogen fixation did not occur.
    • Leucophyllums for Southern Arizona Landscapes

      Starr, Greg (University of Arizona (Tucson, AZ), 1993)
      Leucophyllum is a member of the family Scrophulariaceae and includes 12 species which occur in extreme southern New Mexico, Texas, and Mexico. Leucophyllum frutescens was in cultivation in southern Arizona in the early 1940's and only recently have new species been cultivated. Seven species and their cultivars are discussed with specific reference to descriptions, culture, identification, and distribution. Each species is distinct and all are highly recommended for landscape use.
    • Lonesome Valley: Rio Huasco, River of the Atacama

      Petrie, Jeffrey M.; Boyce Thompson Arboretum (University of Arizona (Tucson, AZ), 2009-12)