TIMBER-TREES. 5 



III. Accracece : (I) Sycamore or Scots Plane (Acer pseudo-platanus) ; 



(2) Norway Maple (Acer platanoidcs). 



IV. Tiliacece : (1) Lime (Tilia parvifolia and T. grandifolia). 



V. Hippocastaneos : (1) Horse-Chestnut (^Esculus hippocastanum). 



VI. Pomacece : (1) Rowan or Mountain- Ash (Sorbus aucuparia) ; 

 (2) Wild Service-tree (Sorbus torminalis) ; (3) Whitebeam 

 (Sorbus aria}. 



VII. Amcntaccce (having flowers in catkins) 



a. Flowers unisexual, monoecious (both male and female on same 



tree). 



1. Cupuliferce (having fruits attached to a cup-shaped in- 



volucre) : (1) English or Pedunculate Oak (Quercus 

 pedunculata) ; (2) Sessile or Durmast Oak (Quercus 

 sessiliflora) (3) Beech (Fagus sylvatica) ; (4) Horn- 

 beam (Carpinus betulus) ; (5) Sweet- Chestnut (Casta- 

 nea vulgaris). 



2. Betulacece or Birch tribe: (1) Birch (Betula alba); 



(2) Common Alder (Alnus glutinosa) ; (3) White 

 Alder (Alnus incana). 



b. Flowers unisexual., dioecious (male and female on different 



trees). 



3. Salicinea or Willow tribe : (1) White Willow (Salix alba) ; 



(2) Crack Willow (Salix fragilis) ; (3) Bedford Willow 

 (Salix Russelliana, a hybrid of above) ; (4) Aspen 

 (Populus tremula) ; (5) Black Poplar (Populus nigra 

 and P. canadensis) ; White Poplar (Populus alba). 



B. CONIFER TREES (Conifera), all evergreen except the Larch; and all 

 with unisexual, monoecious flowers) 



I. Abietinecs, Pine and Fir tribe 



1. PINES (Pinus): (1) Scots Pine (P. sylvestris) ; (2) Austrian 



Pine (P. austriaca) ; (3) Corsican Pine (P. laricio) ; (4) 

 Maritime Pine (P. pinaster) ; (5) Weymouth Pine (P. 

 strobus). 



2. SPRUCES (Picca) : (1) Common or Norway Spruce (P. excelsa) ; 



(2) Meuzies or Sitka Spruce (P. sitchensis). 



3. SILVER FIRS (Abies) : (1) Common Silver Fir (A. pectinata) ; 



(2) Nordmann's or Crimean Silver Fir (A. Nordmanniana) ; 



(3) Giant Silver Fir (A. grandis). 



