PRIMULACEAE 



71 



P. elatior x P. officinalis : 31-6 % good, 69-63 % shrivelled and useless. 



P. elatior (average of flowers from Schonen) : 33 % normal, 67 % shrivelled and 

 useless. 



P. elatior X P. per-officinalis (from Schonen): 45% normal, the rest shrivelled 

 and useless. 



P. vulgaris x P. elatior : 66-9 % normal. 



P. vulgaris (per-acaulis) x P. elatior 178% normal. 



These results appear to be confirmed by the number of seeds developed in the 

 diflferent cases. 



Fig. 242. PriTHula integrifolia, L. (after Herm. M&ller). A, B. Short- and long-styled plants 

 (natural size). C, D. Short- and long-styled flowers, partly dissected (natural size). E. Stigmatic 

 papillae of the short-styled, i% G, do. of the long-styled flowers. H, J. Stigmas of the short- and long- 



styled flowers (x 7). A", L. Moistened pollen-grains of short- and long-styled flowers. 



1816. P. integrifolia L. (Herm. Miiller, ' Alpenblumen,' pp. 350-62,) 

 This species bears dimorphous heterostylous butterfly flowers. The tube of the 

 purple-red corolla is 10-14 nnni- lo"gj and as a rule is of noticeably greater length 

 in the short-styled form, where also the limb of the corolla is broader. {Cf. Fig. 242.) 



Visitors. The following were recorded by the observers, and for the localities 

 stated. 



Herm. MuUer (Alps), 7 Lepidoptera, a Bombyliid, and a beetle. Redtenbacher 

 (Austria), the Staphylinid beetle Anthobium robustum Heer. 



1817. P. villosa Jacq. (?) (Herm. Miiller, ' Alpenblumen,' pp. 362-3.) This 

 species bears dimorphous heterostylous butterfly flowers. According to Pax (Bot. 

 Jahrb., Leipzig, x, 1888, p. 227), the species described by Hermann Muller as 



