ELM TRIBE CATKIN-BEARING TRIBE 263 



3. Humulus {Hop) 



1. H. lupulus (Common Hop). A beautiful climbing plant, 

 commonly cultivated for the sake of its catkins, which are used to 

 give a bitter flavour to beer, and naturalized in many places. 

 Fl. July. Perennial. 



Natural Order LXX VI 



ULMACE^E. Elm Tribe 



Stamens and pistils in the same or different flowers ; perianth 

 bell-shaped, often irregular ; stamens equalling in number, and 

 opposite to, the lobes of the perianth ; ovary not attached to the 

 perianth, 2-celled ; styles and stigmas 2 ; fruit 1- or 2-celled, not 

 bursting, drupe-like, or furnished with a leafy border. Trees or 

 shrubs with rough leaves and clustered flowers (never in catkins) 

 inhabiting temperate climates, and often forming valuable timber 

 trees. 



1. Ulmus (Elm). Perianth bell-shaped, 4- to 5-cleft, persistent ; 

 stamens 5 ; styles 2 ; capsule thin and leaf-like, containing a single 

 seed. (Name, the Latin name of the tree.) 



1. Ulmus (Elm) 



1. U. montana (Scotch or Wych Elm). A tall tree, with almost 

 stalkless leaves, which are obliquely ovate and edged with double 

 teeth ; fruit ovate, green, slightly notched at the top, and with the 

 seed about the centre ; no suckers from the roots. Chiefly found 

 in the north. Fl. March. Tree. 



2. U. campestris (Common Elm). A tall tree, very near the 

 last. Fruit deeply notched, and seed in the upper half, near the 

 notch. Growth usually more upright that in U. montana. A 

 variety with somewhat pendulous branches is sometimes erroneously 

 called Wych Elm. A variety is not unfrequent in hedges with 

 rough, corky bark on stems and twigs. Hedges, parks, etc. ; 

 common. Fl. March. Tree. 



Natural Order LXXVII 



AMENTACEiE. Catkin-bearing Tribe 



Stamens and pistils in separate flowers, and often on different 

 plants ; barren flowers in heads or catkins, composed of scales ; 

 stamens 1-20, inserted on the scales ; fertile flower, clustered, 

 solitary, or in catkins ; ovary usually simple ; stigmas 1 or more. 

 An extensive Order, containing a large number of trees which are 

 highly valued for their fruit, timber, bark, and other minor pro- 

 ductions. They are most abundant in temperate climates, com- 



