Salic aceae 33 



Class 2. DICOTYLEDONES. E^nbryo usually 

 with two cotyledons. Stem with open bundles. Leaves 

 usually with reticulate venation. Flowers often 4-5- 

 merous. 



Subclass I. ARCHICHLAMYDEAE. Perianth 

 simple or absent. Flowers either achlamydeous, or 

 haplochlamydeous, or diplochlamydeous with polypeta- 

 lous corolla. Sympetaly rare (marked in Cotyledoji). 

 Apopetaly occurs not infrequently. 



a. Amentiflorae (Moss)t. Mostly trees or 

 shrubs. (/ flowers usually, and ? flowers 

 often, in catkins. Perianth absent or haplo- 

 chlamydeous and bracteoid. (For b see p. i-j?) 



Order i. Salicales. Deciduous trees or shrubs. 

 Leaves alternate, stipulate, seldom deeply lobed. Flowers 

 dioecious, both sexes in simple catkins. Perianth cup- 

 or saucer-shaped, or modified into one or two or rarely 

 more nectaries. Stamens 2-co , filaments free or rarely 

 connate. Carpels (2). Ovary i-locular with co ovules 

 on two parietal placentae. Ovules anatropous with two 

 integuments. Fruit a loculicidal capsule quite free from 

 the bracts. Seeds small with basal tuft of hairs. Endo- 

 sperm o. 



Only family : Salicaceae. 



t Engler has no names for these groups, simply referring to 

 them as a^ b, c and d. The names used in this book are those 

 made use of by Dr Moss in his lectures at Cambridge. 



c. 3 



