Maybe you could just Google the reputable oil company sites and see what they say? I would trust info posted online by InEssence for example... but I don't think they process Ho leaf... I'm fairly familiar with their range... but I could be wrong. Yes, it did seem very reasonably priced when i was Googling.... I'm going to keep my eye out for it!
Antheia - as far as I know, Ho leaf is in the cinnamon family (maybe Cinnamonium camphorum). I'll double check - I have some amazing Aromatherapy text books... so don't buy a new book yet, I'm onto it!
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