xxiv LIST OF ILLUSTRATIONS 



Fig. Page 



XXII. Two Flowers of the Mountain Honeysuckle {Lonicera 

 alpigena, Linn.), with Ovaries partially united. 

 (After Hermann Miiller) . . . .226 



XXIII. The Fruit of the Mountain Honeysuckle {Lonicera 



alpigena, Linn.), formed by the complete union of the 

 two berries. The scars of the two calyx rings can 

 stiU be seen ...... 227 



XXIV. A Flowering Branch of the Knot-foot {Streptopus 



amplexifolius, D.C.), showing the flower-stalks 

 united to the axis for the length of the internode 

 above their insertion, and the flowers thus hanging 

 below the leaf next above that in the axil of which 

 they arise ...... 256 



XXV. The Leaves of the Wood Sorrel {Oxalis acetosella, Linn.) 264 



1. In the day position. 



2. In the sleep position. 



XXVI. 1. The Flower of a Buttercup (natural order Eanun- 

 culacese); 2. Petal of a Buttercup, showing the 

 Honey -gland at the base .... 328 



XXVII. The Flower of a Pea (natural order Leguminosse) . 329 



XXVIII. The Flower of a Saxifrage (natural order Saxi- 



fragacese) ...... 329 



XXIX. The Head of Flowers of the Groundsel, Senecio (natural 



order Compositse). Enlarged . . . 330 



XXX. The Flower of a Crocus. A typical Monocotyledonous 



Flower (natural order Iridacese). Eeduced . . 331 



