Also, On a similar note
Elona McMahon is a poison vendor in Halas who is currently not selling poison ingredients. Instead she is just used to train skills.
According to,
http://kikyara.tripod.com/merchants/merchants.html and other sources she should be selling "Gelsenium Petals, Gelsenium Root, Snowfall Algae". These are all ingredients used for rogue poisons.