When such an easy kind of plant has so many varieties that look so obviously different, I turn into a collector. Scrolling through the "view only genus" box in my plant list here, looking at the numbers next to the genus names, it's easy to see which genera I'm collecting.
Got my 8th Dracaena yesterday.
13 Crassulas, plus a few NOIDs.
I have more than 9 diff Begonias, but know enough about some to have 9 entries on my list.
7 Philo entries.
7 non-spiderwort Tradescantias.
Kalanchoe looks like it's winning at my house, 13 species/cultivars, a couple NOID's.
What's being collected at your house?