9 o FLOWERS OF LAKES, RIVERS, ETC. 



ensured by insect visitors by the more prominent position of the 

 stiprnas. In the absence of insects the stigmas curl back and touch 

 the pollen of the longer stamens. Insect visitors are not very numerous. 

 Other forms occur in which there are large flowers in which the 

 anthers are mature first. The pistil is long and pendent, and self- 

 pollination is out of the question. In still others the flower is of a 

 medium size, and the anthers may ripen slightly in advance of the 

 stigma, or simultaneously with the latter. There are also flowers of 



I'lioto. Flatters & 



GREAT HAIRY WILLOW HERB (Epilobium ktrsiitum, L.) 



a third type : which are small, and in which the stigma and anthers 

 mature at the same time, and in this case the plant is usually self- 

 pollinated. There are pistillate plants with no pollen on the anthers. 

 The seeds, as in the Rosebay, are provided with a tuft of hairs which 

 aid in wind dispersal. 



The Great Hairy Willow Herb is essentially arenophilous, addicted 

 to a sand soil. But it grows largely in alluvium, which is sandy loam 

 with some humus. 



A rust fungus, Puccinia pulverulenta, is the chief fungal pest, but 

 Sphesrotkeca humuli attacks Willow-herbs generally. 



The Lepidoptera, Bedstraw Hawk-moth (Deilephila galii\ Sericoris 

 urticana, Laverna lactella, L. propinquella, L. ochracella, L. epilobiella, 



