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AUTOPOLYPLOIDY IN TOLMIEA MENZIESII (SAXIFRAGACEAE)
Author(s) -
Soltis Douglas E.
Publication year - 1984
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1984.tb11971.x
Subject(s) - biology , saxifragaceae , ploidy , tribe , botany , taxon , genus , range (aeronautics) , evolutionary biology , genetics , materials science , sociology , anthropology , composite material , gene
Tolmiea menziesii comprises diploid (2 n = 14) and tetraploid (2 n = 28) cytotypes that differ in geographic distribution. Chromosome counts now available indicate that the diploid and tetraploid cytotypes occupy the southern and northern portions, respectively, of the range of Tolmiea. Available data strongly suggest that Tolmiea represents an example of autopolyploidy. The genus is monotypic and very distinct in both floral and vegetative morphology among genera of tribe Saxifrageae. Infraspecific taxa have not been recognized in T. menziesii, and the two cytotypes appear to be indistinguishable morphologically. Karyotypic, flavonoid chemical, and preliminary allozymic data are all in agreement with the contention that the tetraploid cytotype is of autopolyploidal origin.