Viscid Calyx. 6 1 



from below to the mouth of the corolla- tube, and to 

 attain the nectar without ever coming into contact with 

 the arms of the style, were it not for the protection 

 afforded to the flowers by the black gland-tipped 

 trichomas, with which the involucral scales are thickly 

 covered. 



Analogous in all essential points to these viscid 

 bracts is the viscid calyx, such as is developed in 

 Sedum dasyphyllwm, Stellaria cerastoides, in species of 

 Spergula and Cerastium, in many species of Erodium, 

 Geranium, Hypericum, and Prunus, in numerous Labi- 

 atse, Scrophulariacese, and Saxifragese, in Saxifraga' con- 

 troversa, Stembg. (Plate I. fig. 1 1), Linncea lorealis, L. 

 (Plate I. figs. 12, 13), Mibes grossularia, L. (PI. I. fig. 25), 

 Plumbago eur(ypcea, L. (Plate L fig. 32), Girccea alpina, 

 L. (Plate I. fig. 10), and in numerous other flowers. 

 In Circcea alpina, L., we can again see, with very 

 great clearness, that nectariferous flowers, even when 

 of very minute dimensions, are not without protection 

 of some kind or other from crawling insects. In the 

 proterogynous flowers of this plant, the distance which 

 separates the anthers and stigma from the edge of the 

 cup which contains the nectar is so small that, in get- 

 ting to this latter, even animals no more than 1"5 mm. 

 in circumference must necessarily come into contact 

 with the pollen or the stigma, as the case may be. 

 Now, amongst the numerous small wingless creatures' 

 that frequent the places where Circcea alpina grows. 



