I don't know why I didn't notice it before, but my supposed D. brevifolia now looks more like a D. spatulata. I grew it from seed, and I can't remember from who I got them from.
The reason I think it's not D. brevifolia is because it has a tall flower stalk with small, pink flowers. In pictures I've seen with D. brevifolia, the stalks have been short with large, white flowers.
Also, I guess D. brevifolia has more square leaf edges, while mine are spoon shaped. I dunno why I didn't see that before.
Unless there is a pink flowered variety of D. brevifolia?