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Boufford, David

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Boufford

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Boufford, David
Author's Publications: search.filters.isAuthorOfPublication.dada5501-82ae-4ba1-adc5-78c4f0dab019

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Now showing 1 - 5 of 5
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    Developing an Exemplary Collection: A Vision for the Next Century at the Arnold Arboretum of Harvard University
    (2016) Friedman, William; Dosmann, Michael; Boland, Timothy M.; Boufford, David; Donoghue, Michael J.; Gapinski, Andrew; Hufford, Larry; Meyer, Paul W.; Pfister, Donald
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    Elevational patterns of species richness and endemism for some important taxa in the Hengduan Mountains, southwestern China
    (Springer Science + Business Media, 2008) Zhang, Da-Cai; Zhang, Yong-Hong; Boufford, David; Sun, Hang
    We describe the elevational patterns of species richness and endemism of some important taxa in the Hengduan Mountains, southwest China. Species richness data came from publications, an online database, herbaria and Weld work. Species richness was estimated by rarefaction and interpolation. The Hengduan Mountains region was divided into a southern and northern subregion, and all species were assigned to four groups based on their distributional range within this region. The conditional autoregressive model (CAR) was used to relate species richness and explanatory variables. The elevational patterns of total, endemic and non-endemic species richness, at subregion and entire region scales, presented to be unimodal and peaked at similar elevations. Area size was strongly related with species richness, and was more powerful in explaining variation in species richness in the northern subregion than in the southern subregion. A single climatic variable (mean annual rainfall, potential evapotranspiration or moisture index) showed a weak relationship with the elevational pattern of species richness. Area and climatic variables together explained more than 67% of the variation in non-endemic richness, 53% in total richness, and 50% in endemic richness. There were three patterns of endemism at the generic level with increasing elevation: namely endemism increased, decreased, or peaked at middle elevations. All selected taxa have experienced rapid speciation and evolution within this region, which plays an important role in the uniform elevational patterns of total, endemic and nonendemic richness, and in the multiform elevational patterns of endemism.
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    Why Are We Still Producing Paper Floras?
    (Missouri Botanical Garden Press, 2011) Brach, Anthony; Boufford, David
    Advances in online resources and electronic publication provide the sciences with tools to revolutionize education and research (e.g., cataloging, data archiving and access, and identification). Older journals and monographs are being scanned and increasingly postedonline quickly by book scanning projects, although even for new issues, there can be a ‘‘moving wall’ ’or lag time (e.g.,BioOneandJSTOR). Some scientific disciplines are providing the public with pre-print access to articles indigital libraries, while manuscript availability in other disciplines, such as nomenclatural botany, is often delayed until the time of print publication. Within botany, taxonomic treatments should be provided online at all stages of preparation and revision (in certain cases following initial editing). Now, many published floras can be browsed and searched online (e.g.,Flora of North America, Jepson Manual, Flora of Australia).The Flora of China Project provides treatments at all stages, online, prior to printing of volumes. Because of this visibility, the Flora of China Website regularly receives questions from the general public and helpful review comments from botanists worldwide.With pressing issues of cataloging biodiversity, conservation, and sustainable use of resources, botanists are challenged to prepare and revise online treatments, including interactive identification keys and images, for a worldwide audience of students and researchers.
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    A new smut fungus on a new grass: Sporisorium capillipedii-alpini (Ustilaginales) sp. nov. infecting Capillipedium alpinum (Poaceae) sp. nov., from Sichuan, China
    (Magnolia Press, 2016) DENCHEV, TEODOR T.; SUN, HANG; DENCHEV, CVETOMIR M.; Boufford, David
    A new smut fungus, Sporisorium capillipedii-alpini (Ustilaginales), and a new species of grass, Capillipedium alpinum (Poaceae), on which it is growing, are described and illustrated. The collections were made in western Sichuan, China. Capillipedium alpinum differs from other species of Capillipedium by its diminutive size and short, slender inflorescence. Sporisorium capillipedii-alpini is compared with the species of Sporisorium with similar symptoms (destroying all spikelets of an inflorescence) that infect Capillipedium, Botriochloa, and Dichanthium. The new smut fungus differs from these species as follows: from Sporisorium taianum by having larger spores with minutely echinulate spore walls, from S. dichanthicola by having larger spores, from S. sahayae by having lower spore wall ornamentation and thinner spore walls, from S. andropogonis-annulati by having larger spores, and smaller sterile cells with thinner walls, and from S. mysorense by possessing minutely echinulate spore walls and differently colored spores and sterile cells. The types of S. andropogonis-annulati, S. mysorense, and S. sahayae were re-examined and detailed descriptions of these species are given. A key to the smut fungi of Sporisorium, that infect Capillipedium, Botriochloa, and Dichanthium and destroy all spikelets of the inflorescence of an infected plant, is also provided.
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    Testing a hypothesis of unidirectional hybridization in plants: Observations on Sonneratia, Bruguiera and Ligularia
    (BioMed Central, 2008) Zhou, Renchao; Gong, Xun; Boufford, David; Wu, Chung-I; Shi, Suhua
    Background: When natural hybridization occurs at sites where the hybridizing species differ in abundance, the pollen load delivered to the rare species should be predominantly from the common species. Previous authors have therefore proposed a hypothesis on the direction of hybridization: interspecific hybrids are more likely to have the female parent from the rare species and the male parent from the common species. We wish to test this hypothesis using data of plant hybridizations both from our own experimentation and from the literature. Results: By examining the maternally inherited chloroplast DNA of 6 cases of F1 hybridization from four genera of plants, we infer unidirectional hybridization in most cases. In all 5 cases where the relative abundance of the parental species deviates from parity, however, the direction is predominantly in the direction opposite of the prediction based strictly on numerical abundance. Conclusion: Our results show that the observed direction of hybridization is almost always opposite of the predicted direction based on the relative abundance of the hybridizing species. Several alternative hypotheses, including unidirectional postmating isolation and reinforcement of premating isolation, were discussed.