Diastema vexans is a low-growing herbaceous plant with pretty white and lavender flowers and softly hair leaves. It needs fairly warm temperatures and good humidity to thrive, but prefers lower light levels. A nice picture of a whole plant can be seen here; examples of the flowers can be seen here and here.
Two of the most widely grown species in this genus are D. vexans and D. racemiferum. A comparison of the flowers of the two species can be seen here. D. racemiferum is a more dramatic species than is D. vexans.