70167: Three views of flower (natural site specimens), July 31, 1970

7249: Three views of flower (cultivation specimens), July 12, 1972

7236: Habitus (cultivation specimen), July 2, 1972

Origin of depicted specimens: Switzerland, Canton Graubuenden, eastern side of Oberalp-Pass, 2000 m, granite, collected by myself July 31, 1970. At this common site of both parent species (and in spite of the different chromosome number) hybrids are not rare. P. leptoceras begins to flower two weeks before P. vulgaris but the flowering period overlaps for about one week.