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Chromosomal Evolution in Epilobium sect. Epilobium (Onagraceae), II

Steven R. Seavey and Peter H. Raven
Plant Systematics and Evolution
Vol. 128, No. 3/4 (1977), pp. 195-200
Published by: Springer
Stable URL: http://www.jstor.org/stable/23642219
Page Count: 6
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Chromosomal Evolution in Epilobium sect. Epilobium (Onagraceae), II
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Abstract

A cytological analysis of 37 experimental interspecific hybrids within Epilobium sect. Epilobium, involving 23 taxa, has indicated that the CC chromosome arrangement differs from BB by a single reciprocal translocation and was probably, like AA and DD, derived from it. Preliminary results suggest that the CC arrangement may characterize the Asian E. cephalostigma and E. platystigmatosum, which do not closely resemble the species in which it had earlier been detected. The BB arrangement is shown to occur in all North American species of the E. palustre group, including E. oregonense. Direct evidence on chromosome arrangement is now available for some 85 of the approximately 185 species of the section, and may be inferred for at least 25 more.

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