Plant Systematics and Evolution

, Volume 130, Issue 1, pp 79–83

Chromosomal evolution inEpilobium sect.Epilobium (Onagraceae), III.

  • Steven R. Seavey
  • Peter H. Raven

DOI: 10.1007/BF00983075

Cite this article as:
Seavey, S.R. & Raven, P.H. Pl Syst Evol (1978) 130: 79. doi:10.1007/BF00983075


A cytological analysis of 22 experimental interspecific hybrids withinEpilobium sect.Epilobium, involving 15 taxa, has indicated that the generalized western North AmericaE. obcordatum has the BB chromosome arrangement. This strengthens greatly our earlier contention that BB is the original chromosome arrangement in the section. The very distinctive northwestern North AmericanE. luteum, only species in the section with cream-colored petals, has the CC arrangement, like the members ofHaussknecht'sAlpinae. This chromosome arrangement apparently originated in the North Pacific region in plants that were of normal stature. The North AmericanE. leptocarpum, which closely resembles the Japanese endemicE. fauriei and, like it, forms gemmae in the axils of the upper leaves, also resembles it in having the CC chromosome arrangement. The AsianE. platystigmatosum has a novel chromosome arrangement derived from BB, which we here designate the EE arrangement.

Key words

Onagraceae Epilobium sect.Epilobium Chromosomes reciprocal translocations 

Copyright information

© Springer-Verlag 1978

Authors and Affiliations

  • Steven R. Seavey
    • 1
  • Peter H. Raven
    • 2
  1. 1.Department of BiologyLewis & Clark CollegePortlandUSA
  2. 2.Missouri Botanical GardenSt. LouisUSA

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