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♦ ¹Ecology of Commanster
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♦ ⁴Robertson, C. Flowers and insects lists of visitors of four hundred and fifty three flowers. 1929. The Science Press Printing Company Lancaster, PA.
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♦ ⁶Clements, R. E., and F. L. Long. 1923, Experimental pollination. An outline of the ecology of flowers and insects. Washington, D.C., USA, Carnegie Institute of Washington.
♦ ⁷Community studies in pollination ecology in the high temperate Andes of Central Chile. I. Pollination mechanisms and altitudinal variation., Arroyo, M. T. K., R. B. Primack, and J. J. Armesto. 1982. American Journal of Botany 69:82-97

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