On 11 Jul 2011, at 21:51, Roy Herold [NW of Boston] wrote: > ...Asarum europaeum ... is one of our most invasive aliens. Yikes. It survives here, but invasive? No way! I think it cares not for the long summer drought we experience every year. In fact, if you trouble to water it in the summer, A. europaeum makes a rather elegant open ground cover here. Moral to the story: if the authorities concerned with drawing up lists of invasive plants have IQs greater than a boll weevil's, they will take into account that what's invasive in one climate is not invasive in another. This of course poses a problem in a large country like the US with widely varying climate. The problem is compounded by a coterie of hysteric (and quasi- Stalinist) native plant enthusiasts who would love to see all exotics outlawed, but who conceal their true objective during their involvements with said boll weevils. Ooooopsie! I meant "authorities". BTW, does anyone know of an easily accessible (sc. online, in English) key to the genus Asarum? I grew "Asarum grandiflorum" from RHS seed many years ago, but bedamned if I can see any difference from our local A. caudatum. -- Rodger Whitlock Victoria, British Columbia, Canada