Le 15/06/2010 08:42, John Grimshaw a écrit : > Hybridity and the species concept are very complicated issues and come in > all shades of grey, but the scenario Donald Barnett describes where an > apparently stable hybrid is found in an area with only one parent present is > by no means unique. > > Rodger Whitlock's suggestion: I suggest you simply refer to these plants as > "Opuntia × charlestonensis > Clokey", with a foot- or side note stating "believed to be a natural hybrid > between O. phaecantha and O. erinaceae". > > is a good one, but I think you could also use the form: > > " On X mountain is a population of plants that have been described as > Opuntia charlestonensis Clokey, which appear to be of hybrid origin with O. > phaeacantha and O. erinacea [NB spellings!] as parents, although only O. > erinacea is now present. Their status requires further investigation.' > > This places the plants in their biological context as a population (which is > what matters!), relates that population to a taxonomic concept (i.e. > Clokey's name) which is a matter of opinion, and leaves the door open for > both dissent and agreement. > > Clokey has already established specific status for these plants, so nothing > further needs to be done if that is taxonomic viewpoint taken, but an > objective account would also present the alternative view that it could be > treated as a hybrid O. x charlestonensis Clokey (no change in authorship > needed) on account of the following evidence (...) > > John Grimshaw > > Visit John Grimshaw's Garden Diary > http://johngrimshawsgardendiary.blogspot.com/ > > Dr. John M. Grimshaw > Sycamore Cottage > Colesbourne > Cheltenham > Gloucestershire > GL53 9NP > > Tel. 01242 870567 > > _______________________________________________ > pbs mailing list > pbs@lists.ibiblio.org > http://pacificbulbsociety.org/list.php > http://pacificbulbsociety.org/pbswiki/ > > > > > Ce message entrant est certifié sans virus connu. > Analyse effectuée par AVG - http://www.avg.fr/ > Version: 9.0.829 / Base de données virale: 271.1.1/2938 - Date: 06/14/10 20:35:00 > > In total agreance there.