I can only make a supposition on where Hoya Seeds AH-138 comes from. AH Hoya Plant Nursery in Thailand has a lot of plants blooming at the same time all over the place, and insects are continually going from flower to flower. I believe that cross pollinations happen quite frequently producing seed pods. Many of these seeds are planted to see what kind of plant is produced. When something comes across that is interesting, they number it, reproduce it, and sell it as cuttings or rooted plants. I believe these plants are sort of wild crosses, and I’m not sure that they know what the parentage is.