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- Title
NATURAL AND EXPERIMENTAL HYBRIDIZATION IN <em>POTENTILLA</em>.
- Authors
Matfield, B.; Jones, J. K.; Ellis, J. R.
- Abstract
Three natural hybrids have been reported in <em>Potentilla</em> subseries Tormentillae: <em>Potentilla × suberecta</em>, <em>P. × mixta</em> and <em>P. × italica.</em> This paper presents results of morphological and cytological studies and experimental crosses made to clarify the origins and taxonomy of the hybrids, and to investigate the possibility of introgression. All natural hybrids examined were hexaploid (2n = 42). Experimental crosses confirmed that <em>P. × suberecta</em> is the hybrid between <em>P. erecta</em> (2n = 28) and <em>P. anglica</em> (2n = 56), but the origin of the other hybrids is less clear. Tt is suggested that the names <em>P. × mixta</em> and <em>P. × italica</em> have been applied to different forms of a single variable taxon, and that <em>P. × italica</em> should be regarded as a synonym of <em>P. × mixta</em>. The origin of this natural hybrid remains uncertain. It is generally considered to be <em>P. reptans (2n = 28) × P anglica</em>, but numerous attempts to hybridize these species have failed, although one unpublished, successful hybridization is cited. Experimental crosses have indicated an alternative origin for <em>P.× mixta</em>, by hybridization between <em>P. reptans</em> and <em>P. erecta</em>, in which the former either contributes an unreduced gamete or occurs as an autopolyploid cytotype. Vigorous backcross progenies were raised from both <em>P. × suberecta</em> and <em>P. x mixta</em> and the importance of backcrossing and introgression in natural populations is discussed.
- Subjects
SPECIES hybridization; CINQUEFOILS; CYTOLOGY; TAXONOMY; PLANT morphology; GAMETES
- Publication
New Phytologist, 1970, Vol 69, Issue 1, p171
- ISSN
0028-646X
- Publication type
Article
- DOI
10.1111/j.1469-8137.1970.tb04061.x