SECT. II 



PHANEROGAMIA 



493 



The essential variations exhibited within the order are limited to 

 the female flowers, which are sometimes hypogynous, sometimes 

 epigynous, and possess a septated or unseptated ovary, a single ovule 

 or a number of ovules in different positions. These distinctions are 

 utilised in classifying the different families. 



Fig. 439. — Salix viminalis. A, 

 Flowering male-shoot (nat. size); 

 B, male flower with subtending 

 bract (magnified) ; C, female 

 inflorescence ; D - E, female 

 flowers (magnified) ; F, fruit 

 (nat. size); G, the same magni- 

 fied ; H, seed (magnified). 



Fig. 440. — Popuhis tremula. 1, Male inflorescence; 2, 

 female inflorescence ; 3, male flower ; 4, female flower ; 

 5, the same in longitudinal section ; 6, fruit ; 7, the same 

 after dehiscence ; 8, seeds ; 9, diagram of male flower. 

 (After Wossidlo.) 



Family Salieaeeae. — Flowers hypogynous, dioecious ; perianth 

 absent; DISC oupular or consisting of scales; ovary dimerous, UNILOCULAR 

 with numerous parietal ovules ; fruit a capsule ; seeds numerous, 

 furnished with a tuft of silky hairs. Trees and shrubs, bearing simple 

 leaves without stipules, and amentaceous inflorescences (Figs. 439, 440). 



2 



