© Jörg Ochsmann 2001
|Ochsmann, J. 2001 (Internat.
Knapweed Sympos., Coeur dAlene, ID, USA):
An overlooked knapweed hybrid in North America: Centaurea ×psammogena Gáyer (diffuse knapweed × spotted knapweed).
During recent studies
on spotted knapweed (Centaurea stoebe L.) in Europe it became quite obvious that
fertile hybrids with the closely related diffuse knapweed (Centaurea diffusa LAM.)
are far more frequent than expected. Although both parents are noxious weeds in North
America only assumptions of the occurrence of the hybrid are made, no reports of this
hybrid occur in literature. Studies of American literature on invasive knapweed species
provided evidence that this hybrid occurs in North America: In two cases figures assigned
to diffuse knapweed clearly showed characters of the hybrid. Studies in several herbaria
(including MO and MICH) revealed a number of specimens of C. ´ psammogena from seven
different states of the USA.
(Stand / last updated: 28.01.2007)