I few posts, back I was of the opinion that this was not an Acidanthera, and I am correct. I now remember picking up the broken marker from the garden and placing it on the pot until I could get around to making a new one. Now, if only I could remember where the Acidanthera is growing, guess I will just have to wait until it blooms.
I spent some time going back through my pictures from last year and found one showing the flowers of the mystery plant.
It happens to be an Auricula primrose. Like the polyanthus group, they are native to Europe. They come in a wide range of colors in single, semi-double or fully double forms, and these plants do like more sun than the polyanthus types. Even though the auriculas are among the most drought-tolerant of all the primroses, they still prefer a moist, well drained soil.