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    Flora and vegetation of the Tucson Mountains, Pima County, Arizona

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    azu_td_1343825_sip1_m.pdf
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    Author
    Rondeau, Renee Jane, 1956-
    Issue Date
    1991
    Keywords
    Biology, Botany.
    Biology, Ecology.
    Advisor
    McLaughlin, Stephen P.
    
    Metadata
    Show full item record
    Publisher
    The University of Arizona.
    Rights
    Copyright © 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.
    Abstract
    I compiled the first vascular flora of the Tucson Mountains of southeastern Arizona, part of the Arizona Upland subdivision of the Sonoran Desert. The study area consisted of over 40,000 hectares, with two principal biotic communities: desertscrub and desert-grassland. Over 300 km of trails, ridges, washes, canyons, and peaks were surveyed in a three year period, covering all elevations and habitats. This was supplemented by examination of herbarium records. The area is unusually rich compared to other regional floras in the state of Arizona, including a vascular flora of 605 specific and infraspecific taxa in 331 genera and 80 families. The distribution of life forms is: herbaceous annuals and perennials (73%), shrubs (9%), subshrubs (8%), succulents (4%), and trees (1%). Obligate annuals make up 45% of the flora, of which 62% are obligate spring annuals, 33% obligate summer annuals, and 5% either spring or summer annuals. Historical records from the first part of the century are reviewed and compared with the present day flora; 27 species that were found in the Tucson Mountains prior to 1950 have not been collected since, in spite of increased sampling effort. A disproportionate number of these locally-extirpated species are winter annuals.
    Type
    text
    Thesis-Reproduction (electronic)
    Degree Name
    M.S.
    Degree Level
    masters
    Degree Program
    Graduate College
    Plant Sciences
    Degree Grantor
    University of Arizona
    Collections
    Master's Theses

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