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Reproductive Biology of Mixed-Species Populations of Goodyera (Orchidaceae) in Northern Michigan

Jacquelyn A. Kallunki
Brittonia
Vol. 33, No. 2 (Apr. - Jun., 1981), pp. 137-155
Published by: Springer on behalf of the New York Botanical Garden Press
Stable URL: http://www.jstor.org/stable/2806308
Page Count: 19
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Reproductive Biology of Mixed-Species Populations of Goodyera (Orchidaceae) in Northern Michigan
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Abstract

The reproductive biology of Goodyera oblongifolia, G. repens var. ophioides and G. tesselata is discussed with emphasis on the reproductive isolating mechanisms operating in mixed-species populations. Cytology, phenology and pollination of the above three species were studied. artificial hybridizations were made of these three species and of G. pubescens. Results show that within mixed-species populations, G. oblongifolia, G. repens var. ophioides and G. tesselata are not completely isolated reproductively, and hybridization does occur. The deleterious effects of the loss of gametes to interspecific crosses are reduced by seasonal isolation, perennial growth and geitonogamous seed production which is encouraged by self-compatibility and clonal growth. Thus, hybridization in mixed-species populations is apparently kept to levels low enough to allow the species to maintain their identities.

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