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POPULATION VARIATION, DIFFERENTIATION AND REPRODUCTIVE BIOLOGY OF STACHYS PALUSTRIS L. S. SYLVATICA L. AND
Author(s) -
SM S. AMBIGUA,
Wilcock C. C.
Publication year - 1974
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1974.tb02152.x
Subject(s) - biology , ecotype , inflorescence , botany , population , sociology , demography
Summary The population variation of leaf and inflorescence characters of Stachys palustris L., S. sylvatica L. and the hybrid S. × ambigua Sm. in Britain has been studied and shows S. palustris and S. × ambigua to intergrade. S. palustris varies extensively both within and between populations and, from studies of the variation of leaf and rhizome characters in wet and dry soil, the ‘dry‐ground’ form is shown to be an ecotype. S. sylvatica is less variable, both within and between the populations sampled. S. palustris outbreeds more readily than S. sylvatica and this difference in breeding system may be responsible for the patterns of variation exhibited by the parents. Attempts to backcross S. × ambigua to either S. palustris or S. sylvatica have been totally unsuccessful. The intergradation between S. palustris and S. × ambigua is unlikely to be the result of introgressive hybridization but is principally produced since first, 5. palustris exhibits a much greater range of variation than S. sylvatica and secondly, the F t is not intermediate but closer to S. palustris.