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Justin A. Porter, David Berle and Hazel Y. Wetzstein

, GPS- and GIS-based surveys were integrated to map the distribution and characterize the ecological habitat of georgia plume. An advantage of this approach is that locations of populations and individual trees can be accurately recorded, which can be

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Meiling Yang, Fang Li, Hong Long, Weiwei Yu, Xiuna Yan, Bin Liu, Yunxiu Zhang, Guorong Yan and Wenqin Song

long time, usually 2–3 months, to relieve seed dormancy. We sought to shorten the time for seed germination. Due to interference of human activities and natural disasters, the natural population and distribution area of M. sieversii is reduced, and it

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Juan Guillermo Cruz-Castillo, Juan Ángel Tinoco-Rueda and Franco Famiani

in Mexico using georeferenced trees and the database of WorldClim with a spatial resolution of 2.5 min. The potential distribution of P. schiedeana was made on the basis of the ecological niche method ( Hijmans et al., 2005 ) and only data regarding

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Michael J. Willett, Lisa Neven and Charles E. Miller

assessing pest distribution. Insect-specific research. Because CM is a key pest in pome fruit production systems, its literature is extensive. We specifically reviewed the literature on CM distribution, diapause initiation, termination, and ecological

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Lyn A. Gettys

structures or ecological functions, or hybridizing with natives” ( Florida Exotic Pest Plant Council, 2017 ). Torpedograss is a rhizomatous grass that is commonly found along shorelines and in littoral areas of lakes, ponds, reservoirs, canals, and other

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Steven F. Price, Marc L. Schuette and Elizabeth Tassie

Digital imaging and analysis was used to quantify and characterize the light exposure patterns of photosensitive paper tubes placed in representative cluster positions in two grape (Vitis vinifera L.) canopies: a minimally pruned and a vertically trained canopy. Blue pixel values of the captured images had a negative correlation with the log of irradiance from an integrating quantum sensor (r2 = 0.9308). The spectral response of the photosensitive paper was not measured. Histograms of incident light distribution on individual paper tubes were developed using imaging software. Histograms were able to quantify the distribution of incident light on individual tubes and were clearly related to the tube's exposure in the canopy. Average population curves of pixel light distribution of 20 tubes in each canopy were able to differentiate the typical cluster light environment in the two canopies. Tubes in the minimally pruned canopy had a larger proportion of their surface exposed to irradiances > 50 μmol·s-1·m-2 and 65% higher average irradiance than the vertical canopy. Image analysis of photosensitive paper appears to be a workable method to record the distribution ofincident light in plant canopies and may have utility in a range of ecological studies.

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Michael N. Dana

Interest in native plant species for general landscape planting, mitigation of environmental impact and ecological restoration plantings continues to expand with public awareness of environmental quality. An expanding area of opportunity exists for the landscape horticulture industry to supply non-traditional plant materials to support landscape planting with native species. To capitalize on the opportunity, horticulture and landscape architecture students and practitioners must become knowledgeable of species native to their region. Video is a useful medium for increasing such knowledge. This presentation will review the development, production, distribution and content of six video programs that survey the native herbaceous flora of Indiana prairies and woodlands. Each program is less than 30 minutes in length, to facilitate classroom use and presentation in broadcast formats. Botanically correct nomenclature is presented graphically as each species is introduced. The narration includes botanical, ecological and horticultural information, but emphasizes plant lore to increase interest for general audiences and provide memory clues for those attempting to learn the plants. This project, supported by the Indiana Association of Nurserymen, provides a good example of how horticultural industries can become leaders as the public expands its demand for improved environmental quality.

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Zhang Deshun and Jia Xiangyun

Taking Beihua shan and Wuling shan mountain as examples, the author investigated the Wild Ornamental Plants (WOP) resources in mountain area of northern China in detail with ecological systematic sampling method. The meteorological data of no meteorological observed plots was reckoned theoretically using statistics. And then the main factors that influence the WOP distribution were sifted out by the progressive regression analysis. At last the optimized chains of adaptability with which the WOP will be introduced from mountain to urban area and of most suitable place on which certain plants will be introduced were defined. In order to enrich the capital Beijing's afforestation materiels, this paper offers a reliable basis in terms of theory.

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Laura C. Merrick

Cucurbita argyrosperma, formerly known as C. mixta, is a squash species native to Mexico and Central America. Cultivars of the species which have been grown in the United States include many of the cushaws and the `Silverseed Gourd. A recent biosystematic analysis-which included studies of experimental and natural hybridization, isozymatic and morphological variation, ethnobotany, and ecological and geographical distribution-has shown that the closest relative of C. argyrosperma is C. moschata. The data reveal intriguing implications for evolution of the genus as a whole, since the previous hypothesis that C. lundelliana is the progenitor of C. moschata is refuted. A wild ancestor, three cultivated varieties and a feral derivative are recognized within C. argyrosperma. Two of the three cultivated botanical varieties-vars. argyrosperma and stenosperma -have been selected in many regions almost exclusively for seed production. The relatively large seeds are marketed either with or without hulls. The other botanical variety, var. callicarpa, has been selected for both fruit and seed production. Northern cultivars of var. callicarpa arc notable for their adaptation to marginal environments, including hot climates and poor soil conditions.

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Man-Sang Lee and Tae-Oh Kwon

This study was carried out to investigate the distribution, morphological and ecological characteristics, cross fertility and peroxidase banding pattern in floral buds of wild Prunus yedoensis var. nudiflora and its putative parents, P. subhirtella and P. donarium growing at Haenam districts in Korea. P. yedoensis was distributed 200-250 m elevation and showed extensive variations in sterility and morphological variations. The morphological characteristics of P. yedoensis are judged to be intermediate between P. subhirtella and P. donarium. P. subhirtella and P. donarium were naturally found 150-350 m and 150-900 m elevation. Flowering date of p. subhirtella, P. donarium and p. Yedoensis were early April, mid-to-late April and around April 8, respectively. The floral morphology of p. yedoensis showed greater variations than that of p. subhirtella. It is proved that p. yedoensis is an interspecific hybrid between P. subhirtella and P. donarium considering the intermediate characteristics of flower, leaf and peroxidase banding pattern of the floral buds by isoelectric focusing electrophoresis.