When I saw that B&D Lilies had Lilium martagon var. albiflorum, I just had to order. It's such a rarity to find it offered in the US. So I scaled the lilies I obtained, and these are the results: more support for Lorn's statements. (Lilium martagon rarely produces stem bulblets.)
Only two of the eight martagon scales produced bulblets, while every scale of the orientpets produced multiple bulblets.