ALLTJKEMENTS OF ANIMALS FOK THE DISrEESlON OF POLLEN. 



1'; 



■without the development of iiay special expansion. The neetai-ies are unusually 

 well-developed on the perianth of the American Uvularia grandijiora. in the 

 numei-ous species of Fritillaria, and especially in the Crown -Imperial, often 

 cultivated in gardens under the name of Fritillaria imj.H'nal>s. Each of the six 

 pei'ianth-leaves in these plants exhibits on the inner side near the thickened base 

 a circular, shai-ply-delined depression in which sparkles a large drop of honeJ^ 



Houey is seldom secreted by tlie calyx. 

 The best examples are the coloured, ex- 

 panded and fleshy calyx of the various 

 species of the genus Cuphca and of the 

 Nasturtium [Tropaohim). The species of 

 the last-named genus have a calyx from 

 whose uppei- portion a long spur projects. 

 Honey is secreted in the narrowed lower 

 portion of this spur, and indeed so abun- 

 dantly tihat it sometimes reaches to the 

 moutli. 



And now we come linally to the nec- 

 tm-ies in the i-egion of the coi-oUa. Those 

 developed at the base of the flower as 

 well as on the carpels, stamens, perianth- 

 leaves, and calyx, though strikingly varied, 

 are poor in comparison with the wealth of 

 forms which are shown in the petals. In 

 this book it is impossible to give an ex- 

 haustive description of these structures, 

 and it must suffice to group together 

 generally the most striking forms and 

 th<»e best fitted to illusti-ate the pi-ocesses 

 hereafter to be described. In the corollas 

 of the Mulleins, especially in those of 

 Veriascum Blattaria and phaniceum, the 

 secretion of honey takes place on the large, 

 lower petal in the form of numerous 

 drops scattered over the middle of the leaf. 

 Each drop comes from a stomate, and, therefore, when the flower opens this leaf 

 looks as if it wei^e studded with dew. But this seldom happens. More usually 

 the small drops flow together, and then a large di-op appeai-s in some special spot. 

 In the twining Honeysuckles {Lonicem Capri foliiLm, etni.-sca. grata, impli.ra, 

 Perichjmenu,m, kc), in the Bearberries {ArctostapJiyI<'S alpina and UiU'iir/fi). in 

 AUionia and Crufianella. in a species of Winter-green (Pyrola Sicunda^, as weU 

 as in numerous other plants, honey is secreted in the manner just described in the 

 lowest part of the tubular or beU-shaped corolla. In the Alpiue Roses {Ehododen- 



\f 



Fig. 24S.— X;\roi?sus (,.>'ari-i>,-^:(.': Pseudonarcissus). i The- 

 complete flower. ^ ihe flower cut longitudiD;iil.T. 



VouIL 



63 



