PRIMULACEAE 



63 



The narrowness of the corolla-tube protects the nectar from rain-drops, which are 

 unable to displace the air. 



Kerner states that many species are heterostylous. 



1803. A. septentrionalis L. (Herm. jNIuller, 'Alpenblumen,' p. 35S ; Kerner, 

 'Nat. Hist. PI.,' Eng. Ed. i, II, p. 341.) — The white flowers of this species are 

 only 6 mm. in diameter. {C/. Fig. 237.) Kerner says that automatic self- 

 pollination is ultimately ef- 

 fected by contact of the 

 anthers and stigma. 



Visitors. — Herm. Miiller 

 observed an Empid, a Syrphid, 

 and 3 IMuscids. 



1804. A.Chamaejasme 



Willd. (Herm. ^Miiller, 'Al- 

 penhlumen,' pp. 358-9.) — In 

 this species the flowers are 

 7-8 mm. in diameter. The 

 nectar-guide is at first yellow 

 in colour, but becomes car- 

 mine-red after polUnation has 

 been effected. Should insect- 

 visits fail, the latter takes place automatically by the fall of pollen. (C/. Fig. 238.) 

 Visitors. — Herm. IVIiiller observed 15 flies, 4 Lepidoptera, and a bee. 



Fig. 2^7. Aiidrosacc septciib'totialis^ L. (after Herm. M'iller). 

 A. Flower seen directly from .above. B. Do. in longitudinal section. 

 C. Pistil seen otiliquely from abo\ c { x 7). 



Fig. 238. Androsacc Chani-aejasmc, I^Y////. (after Herm. Muller). A. Flower seen directly from 

 above. B. Do. in longitudinal section. C Older pistil seen obliquely from above (x 7). £1. Youn^'er 

 pistil. 



1805. A. obtusifolia All. (Herm. i\Iul!er, ' Alpenblumen,' p. 360.} — The white 

 flowers of this species are more than 8 mm. in diameter. Autogamy is easily eff'ected. 



Visitors. — Herm. Miiller observed 10 flies and 3 Lepidoptera. 



1806. A. alpina Lam. ( = A. glacialis Hoppe). (Herm. Muller, 'Alpenblumen,' 

 p. 360.) — The white or rose-red flowers of this species are 5 mm. broad, and possess 

 nectar-guides. They are homogaraous, and autogamy takes place should insect- 

 visits fail. 



