These people sell some unusual flours: http://www.specialfoods.com/flours.html Included are: white sweet potato, cassava, malanga, yam, lotus, milo, water chestnut, artichoke. Which are paleo? Using this dictionary I looked them up: http://food.epicurious.com/db/dictionary/terms/indexes/dictionary.html I found: White sweet potato - This edible root belongs to the morning-glory family and is native to tropical areas of the Americas. So not paleo. See: http://food.epicurious.com/db/dictionary/terms/s/sweet_po.html Cassava - This is the name of the plant that tapioca comes from, so this is just a fancy name for tapioca. Not paleo. Here is some on the plant: http://food.epicurious.com/db/dictionary/terms/c/cassava.html Malanga - Not found. Yam - Sweet potatoes are often called yams. True yams, however, are not widely marketed and are seldom grown in the United States. See: http://food.epicurious.com/db/dictionary/terms/y/yam.html Lotus - A water lily. I guess the flour would come from the root. Seems paleo. See: http://food.epicurious.com/db/dictionary/terms/l/lotus.html Milo - Not found. Water chestnut - The edible tuber of a water plant indigenous to Southeast Asia. Why not paleo? See: http://food.epicurious.com/db/dictionary/terms/w/water_c0.html http://food.epicurious.com/db/dictionary/terms/w/water_ch.html Artichoke - A name used by three unrelated plants. But none-the-less paleo. See: http://food.epicurious.com/db/dictionary/terms/a/artichok.html Don.