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Further Studies in the Genus Dryopteris: The Origin of D. clintoniana, D. celsa and Related Taxa

S. Walker
American Journal of Botany
Vol. 49, No. 5 (May - Jun., 1962), pp. 497-503
Stable URL: http://www.jstor.org/stable/2439420
Page Count: 7
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Further Studies in the Genus Dryopteris: The Origin of D. clintoniana, D. celsa and Related Taxa
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Abstract

Cytogenetic studies of 5 Dryopteris species, from North America, together with wild and synthesized hybrids between some of them, show that D. clintoniana and D. celsa are allohexaploid and allotetraploid respectively. Cytological and morphological evidence points to D. cristata and D. goldiana being parental to D. clintoniana, whilst D. goldiana and D. ludoviciana are parental to D. celsa. The taxon D. x australis is triploid and has been synthesized; it is the backcross between D. celsa and D. ludoviciana.

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