(With 5 figures in the text)
THE COMPARATIVE BIOLOGY OF CLOSELY RELATED SPECIES LIVING IN THE SAME AREA
I. EXTERNAL BREEDING-BARRIERS BETWEEN PAPAVER SPECIES
Article first published online: 2 MAY 2006
Volume 59, Issue 1, pages 15–26, April 1960
How to Cite
MCNAUGHTON, I. H. and HARPER, J. L. (1960), THE COMPARATIVE BIOLOGY OF CLOSELY RELATED SPECIES LIVING IN THE SAME AREA. New Phytologist, 59: 15–26. doi: 10.1111/j.1469-8137.1960.tb06197.x
- Issue published online: 2 MAY 2006
- Article first published online: 2 MAY 2006
- (Received 7 November 1958)
It has been demonstrated that in Britain five species of Papaver (a) frequently occur together, (b) flower over the same general period, (c) are normally insect-pollinated and possess insect visitors in common. Hybrids are rare under natural conditions although some can easily be produced artificially.
The external barriers reducing the chances of natural hybridization are the facts that (a) some of the species have mechanisms facilitating self-pollination, and (b) specific selection by the principal insect visitor, the honey-bee, tends to reduce the chances of cross-pollination between the species.