The clematis on the chain-link fence have been multiplying slowly. There used to be one five years ago, now there are four. At a guess the new ones sprouted from seeds. Of those, one has very bright leaves. You could say they look sick --  or desireably variegated. The flowers are full-size and abundant, like the parent vine, which is Clematis jackmanii, an old, proven cultivar. Apparently the leaves, inspite of lacking a full load of chlorophyll, are catching enough sunlight to fuel full bloom. But could this blotchy variegation be a virus? Will the plant be weakernext year? Can such a virus jump to nearby clematis plants? I hope not, but time will tell.