Well, I had this pot of Tephrocactus. One day I saw an unknown crassulaceae seedling sprouting. At first I thought it was an echeveria (the pot of Tephros being next to my echeveria elegans). But as it grew, it started looking like a purple senecio of some kind. As it yet grew larger, it started looking like a crassula of some kind. The leaves were very fragile, and fell of at the lightest touch, and soon those leaves became more plants. The plant in fact flowered multiple times. After endless googling, I finally found that it was a lenophyllum Texanum.