Muiria hortenseae, sometimes called the 'mouse head' mesemb or 'muiskopvygie' (Afrikaans), is being grown widely in cultivation, as can be seen on the Internet plant and seed markets. It comes from a restricted area in the Tanqua Karoo, near Barrydale and north of Riversdale. The plant is said to be rare and the genus Muiria is monotypical, consisting of only one species. The leaves are covered in a soft fur. The single, waxy white or pale pink flowers appear on the tops of the rounded leaves in spring and summer. The petals in rows closer to the centre are progressively shorter. Fruit capsules have six sections. The seeds are small, brown and smooth. The plant hybridises in nature with Gibbaeum album, a species clearly closely related (www.bidorbuy.co.za and Wikipedia).