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Richard is quite right in recognizing the relation of this species to Annona cherimola, but, for reasons assigned in describing the section Saxigena, it seems advisable to place to place this and A. crassivenia in a special section.
Here are some A. bullata on cherimoya, reticulata and glabra. I will keep everyone updated. Also, I noticed the wood has a cinnamon scent when cut.