Data from: Voucher specimens of Petrocosmea wangii sp. nov. and P. yei sp. nov.

In 2020, we conducted fieldwork in some limestone areas where there were no previous records of Petrocosmea. On August 5th, a small population of an unknown Petrocosmea species was discovered on the stone wall of a small sinkhole in a limestone valley occupied by Pinus yunnanensis Franch. in the northern part of Shiping County, Yunnan. Morphologically, the plant closely resembles P. sericea, but with an extremely short corolla tube (only 2 mm, the shortest in all known species of Petrocosmea) and glabrous and straight filaments. We describe this species as P. wangii. On September 19th, another unknown species of Petrocosmea was collected in Mojiang County. The individuals we planted in the greenhouse in December of that year produced flowers similar to P. forrestii, and we subsequently went to the same locality during flowering to confirm the prevalence of the flower morphology. Morphologically, it most closely resembles P. forrestii, but its filaments are adnate to the base of the corolla tube for about 2 mm, which easily differentiate it from all other known species of Petrocosmea, and we describe this species as P. yei.