The familiar "florists' chrysanthemums" pictured here and so popular this time of year are now in the genus Dendranthema (dendro = woody, a reference to their woody annual stems). Like many other people, the Phactor learned to call the Shasta or ox-eye daisy Chrysanthemum lecanthemum, which is kind of fun to say, except it meant "goldflower-whiteflower". Leucanthemum (leuco = white) is their new genus. Other former chrysanthemums are the pyrethrum daisies (feverfew - long known as a remedy for fevers, and as a source of the insecticide of the same name) are now placed in Tanacetum. And what of the real chrysanthemums? Of the 300-400 species that used to be in this genus, now there are two, both annuals of the Mediterranean region.
Does expression of the toxA operon depend on ToxT as well as ToxA?
2 days ago in RRResearch