88 Flowers and their Unbidden Guests. 



the corolla is partly covered with trichomes, but these 

 combine with others given off from the filaments to 

 form a thick tangle that covers in the nectary. 



In many cases the inner surface of the corolla is 

 smooth ; and the tangled trichomes that cover in the 

 nectary are confined to the base of the filaments. Such 

 is the case, e.g., in Lydum barbarum, Atropa bella- 

 donna, IpoincM violacea, and Polemonium coerukum. 

 In CoboM scandens (Plate III. fig. 85, longitudinal 

 section of flower), the base of each filament looks as 

 though it were wrapped up in white fur ; and the fine 

 fur- like bundles of trichomes form, by their juxtaposi- 

 tion, a stopper, which divides the bell-shaped coroUa 

 into two chambers, the posterior of which secretes the 

 nectar, while the anterior shelters the stigmas and 

 anthers. In Tulipa silvestris (Plate III. fig, 95, base 

 of ovary, a single stamen, and lower part of a perianth 

 leaf, which has been cut across) the nectar is secreted 

 by the bases of the filaments, just as in the Geraniums. 

 Each filament is hollowed out at its base on the side 

 turned towards the perianth, and these hollows are fuU 

 of nectar. They are completely covered in by bundles 

 of trichomes, which are given off from the part of the 

 filament just above them; so that an insect cannot 

 possibly get at the nectar without forcing its way in 

 underneath the bundle of trichomes, and slightly lifting 

 up the whole stamen. 



In Marrubimn, peregrinum and Daphne Blagayana 



