Can you help me ID this bulb? I'm assuming it's an actual variety and not a hybridization of what was in the pot I had.

It sort of looks like this: Amaryllis (Hippeastrum striatum)

But mine is definitely a larger bloom size...mine is about about 6". And mine doesn't seem to be fragrant, either (Hippeastrum-striatum is listed as fragrant).

Normally my amaryllis bloom indoors in January and February, but this I think I confused this bulb because I took the pot that had amaryllis bulbs in it and repotted all of the bulbs in March. (I had no idea there were so many bulbs in it, there were only 4-5 flowering amaryllis this past winter, but there were easily triple that number of bulbs in the pot! I separated them into 5-6 different pots around March.)

It could be H. striatum. 6" across the face is within the size range. I'm not sure if striatum is really fragrant. Mine certainly isn't. Sometimes Amaryllis will bloom out of season after repotting. I just had one do the same thing.

Thank you for confirming that yours isn't fragrant, I think that helps firm up my belief that what I have is H. striatum.

I have another amaryllis sending up a scape, too...I might be back for another ID at that point!

I'm still left wondering, though, if the original owner of the plant could have really put that many different bulbs in one pot, or if some of these are growing from seeds or multiplying from other bulbs. How do amaryllis reproduce bulbs? Do bulbs form from other bulbs, or do bulbs only form from germinated seeds?

Most Amaryllis reproduce asexually from bulblets that form on the original bulb. Some cultivars are very slow to produce bulblets. Some cultivars produce lots of bulblets, striatum is noted for this. The baby bulbs are easily separated when they grow their own roots. My guess is that's what happened in your pot. Amaryllis blooms also self pollinate and form seeds or can be cross pollinated to form new crosses. Some cultivars are resistant to forming fertile seeds, some are great seed producers. It takes some time, but seeds eventually produce tiny bulbs. There are some posts on this forum about germinating the seeds.

Barbara, thank you for the explanation on bulb growth and amaryllis propagation.

I definitely don't know as much about it as I do daylilies, but I'm trying to learn. Earlier this year I was dabbing pollen from one amaryllis flower to the next (I think there were about 4-5 different plants) and I only ended up with one viable seed pod and I have no idea where the seeds have ended up now, but I might attempt it again just for fun.