1 literature reference for Asperula exasperata subsp. petraea (V.I.Krecz. ex Klokov) Pjatunina:

Author: Pjatunina
Year: 1995
Title:
Source: In: Byull. Moskovsk. Obshch. Isp. Prir., Otd. Biol. 100: 73