The genus Oroya has only two or three species, and comes from Peruvian Andes. They have a distinct hansom appearance and small flowers of unusual shape. Coming from the mountains they can handle light night frost, and do not like heat and full sun coming together.
In culture Oroyas are slow developing plants, and reaching flowering size in more than 5 years. Larger plants grow quicker and bloom reliably.
Oroya peruviana blooms every summer in my greenhouse, producing it's modes flowers continuously for couple months.