Germination attempt update:
I ended up purchasing a packet of seeds from Sheffield’s Seed Company. Listed as Chinese Mahogany, Chinese Toon, Red Toon, Toona sinensis. It contained around 70 seeds. I soaked half of them in carbon-filtered tap water for about 24 hours and planted in peat pellets. Kept at about 85F under a domed tray for 7 days so far. On the sixth day, germination was evident in about half the pellets.
In these photos, you see some of the most advanced seedlings today. I have potted a couple as roots had penetrated the bottom of the pellets. I put these under an LED grow lamp as it is still a little too cool to place them anyplace else to get enough light to avoid legginess.
I am cautiously optimistic! I soaked the remainder of the seeds yesterday and committed them to pellets this evening. Great luck sprouting at one week. Hopeful that we will end up with lots of little trees to pot up by summer.