Senecio jacobaea, called tansy ragwort here, has been accidentaly introduced into several places in North America, including the Fraser Valley near Vancouver. Several years ago I worked for an entomologist attempting to introduce biological control insects (cinnabar moths didn't work because ground beetles cleaned up too well on their ground level pupae, but 2 species of specific seed eating flies are doing not a bad job since). The 93 edition Hive and honey bee (p 1195) lists S. jacobaea as poisonous to bees or brood, but doesn't give a reference for details. I've read that the alkaloids in tansy ragwort seeds (contaminating some grain crop, maybe Africa??) were enough to cause health problems in human consumers. (dairy cattle consuming tansy ragwort (in hay where they don't avoid it) have their liver harmed). Malcolm, there may be some information on alkaloid content of tansy ragwort honey available through your Agriculture ministry. Knapweed (Centaurea sp which has invaded about 100,000 acres of rangeland in B.C) sometimes is the source of large crops of a lovely looking golden honey which has not a bad flavour which in a few seconds turns to a very bitter taste which sticks in your mouth. Apparently the bitterness dissappears after a few months storage. It isn't listed as one of the poisonous plants. cheers Kerry Clark, Apiculture Specialist B.C. Ministry of Agriculture 1201 103 Ave Dawson Creek B.C. V1G 4J2 CANADA Tel (604) 784-2225 fax (604) 784-2299 INTERNET [log in to unmask]