Alberto, Claude, Diana et al, The double flowered variant of O compressa is in commerce in the UK - see the RHS plantfinder for details. Also, a tendency to produce double flowers is quite common in O pes-caprae. In the naturalised population of the latter in Gibraltar both double and semi-double forms are frequent. Doubling of the flowers of both of these, and a number of other S African taxa, is noted in the Salter monograph, see p23. regards Robin Attrill