90 



M.OWKRS OK LAKES, RIVERS, ETC. 



ensured In' insect visitors by the more prominent position of the 

 stigmas. In the absence of insects the stigmas curl baci< 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 



Great Hairy Willow Herb (Epilobiuni hirsutum, 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 plains with no pollen on the anther.s. 

 The .seeds, as in the Rosebay, are ])rovided with a tuft of hairs which 

 aid in wind dispersal. 



The Great Hairy Willow Merb is essentially arcnophilous, addicted 

 to a sand soil. I5ut it grows largely in allu\ium. which is sandy loam 

 with some humus. 



A rust ftrngus, Puccinia piihrnt/cn/a, is the chief fungal pest, but 

 Sph(€i-otluca hitmuli attacks Willow-herbs generally. 



The Lepidoptera, Bedstraw Hawk-moth \Dcilephila galii), Sericoris 

 itrticana, Lavcnia lactella, L. propinquella, L. ochracella. L. cpilobiella. 



