Petrorhagia Petrorhagia, (Chaub. & Bory) P. W. Ball & Heywood

16. P. glumacea (Chaub. & Bory) P. W. Ball & Heywood View in CoL , op. cit. 3: 169 (1964)

( Kohlrauschia glumacea (Chaub. & Bory) Hayek ).

Up to 50 cm, glabrous, more or less simple. Leafsheaths about as long as wide. Bracts obtuse. Petals 12-18 x 2- 5-4-5 mm; limb entire, crenate or laciniate, obcuneate or obcordate, purple. Seeds 1-5-2-2 mm, tuberculate to almost smooth. • Balkan peninsula. Al?Bu Cr G r Ju [It].

A variable and somewhat confused species containing two taxa o f uncertain status; var. glumacea , with the petal-limb crenate or laciniate, and seeds 1-7-2-2 mm, almost smooth, but with a few tubercles (southern part of range); and var. obcordata (Margot & Reuter) P. W. Ball & Heywood , with the petal-limb entire, obcordate, and seeds 1-5-1-8 mm, tuberculate (northern part of range). It is uncertain to what extent these characters are correlated, but further investigation may show that var. obcordata should be raised to at least subspecific rank. There is also considerable variation in pollen-size. The problem is complicated by extensive confusion of var. obcordata with 13 in Bulgaria and Greece, and, because of this, it is not absolutely certain that P. glumacea occurs in Bulgaria at all.