Hi Maks, Welcome to the forum, and thanks for sharing your photos. It's not easy to identify maples when they're young seedlings. The young leaves can be somewhat different of those of a mature tree. What's more, they can hybridize, or revert to a less spctacular form when they're from seeds. I suppose they're from seeds, right ? To me : 1_1 is certainly a form of Acer amoenum. But there are hundreds of cultivars... 2_1 could be Acer tegmentosum, but there are other species that have a "snake-bark" and similar leaves when young. 3_2 looks like Norway maple, Acer platanoides. Or another... 4_1 er... 5_1 and 6_1 look like trident maple to me, Acer buergerianum. Could be some kind of Acer tataricum, but I don't think so... 7.1 Acer pectinatum ? 8_1 Acer japonicum, or A. shirasawanum, or A. pseudosieboldianum, or... Not a palmatum or amoenum anyway. 9_1 is definitely a variety of palmatum or amoenum. It's a green dissectum, but since it's from seed, even if you knew the parent tree(s), you couldn't name it. Most of the dissectums have a kind of weeping habit, except 1 (or more ?). If when mature the port is straight, then it could be from an Acer palmatum 'Seiryu'. Sorry I can't help you more. Did you sow them yourself ? Where were the seeds from ? Anyway, they look very healthy (except 7_1 that shows a bit of chlorosis).