I purchased some carnivorous plants for my terrarium, and it struck me that venus fly-traps might be considered geophytes... with their little "bulbs". I tried to google it, but didn't find a definitive answer. I purchased all natives to southeastern USA... Dionaea muscipula, Pinguicula primuliflora, and Drosera filiformis var. tracyi. Finally an answer to all my peat gnat pest problems!