Petalodon (pet-ah-LOH-don) is distinguished by a caespitose habit, a congested, successively-flowered raceme borne by a peduncle round in cross-section. The sepals form a cup that is bent abruptly in the middle. The petals are cartilage-like with a callus at the base that appears as a pair or a fused pair of processes. The lip is oblong and not verrucose. These species used to belong to Masdevallia section Dentatae.
Photo credits are on each photo. Photos may not be used without permission.