72 



ANGIOSPERMAE DICOTYLEDON ES 



P. villosa Jacq. is apparently P. hirsuta All, for the former is only to be found 

 in Steiermark. Gremli (' Exkursionsflora fur die Schweiz,' 6. Aufl., 1889, p. 359) 

 says that P. hirsuta All is identical with P. viscosa Vill, but not with P. villosa 



Koch^ nor with P. villosa /of^. 

 [P. villosa Jacq. P. villosa 

 Wulf., according to the Index 

 Kewensis7[ 



The flowers are of a 

 dark violet-red colour, with 

 a tube 10-13 mm. long, but 

 hardly i^ mm. wide, so that 

 only Lepidoptera can get at 

 the nectar. {Cf. Fig. 243.) 



Visitors. Herm. Mai- 

 ler observed 3 butterflies ; 

 also a beetle as an unbidden 



Fig. 243. Primula villosa, Jacq. (?) (after Herm. MuUer). 

 Short- and long-styled flowers, seen from the side (natural size). 

 Do., seen from above. E, F. Do. in longitudinal section. 



A, B. 

 C,D. 



guest. 



1818. P. viscosa All. 



( = P. latifolia Koch, and P. 

 graveolens Heg.). (Herm. Miiller, ' Alpenblumen/ pp. 367-9.) This species bears 

 dimorphous heterostylous butterfly flowers. The corolla-tube is so narrow, that 

 between it and the stigma the distance is scarcely \ mm., and consequently the 



K. 



o^ 



Fig. 244. Primula viscosa, L. (after Herm. Muller). A, B. Short- and long-styled flowers, partly 

 dissected (X 2). C, Z?. Stigmas of do. ( X 7). , /^ Stigmatic papillae of do. C, .^. Dry pollen- 

 grains of do. y, K. The same, moistened. L. Cross-section of a long-styled flower fast above the 

 stigma (X 7). 



nectar can only legitimately be sucked by the proboscis of a lepidopterous insect, 

 which must at the same time touch the anthers and stigma. The requisite length 

 of proboscis is 12-14 J^- {Qf- Fig- 244.) 



Visitors. Herm. Muller only observed useless (Rhingia campestris Mg^ and 

 injurious (Bombus mastrucatus Gersl, stealing nectar) guests. 



