TREES AND SHRUBS 



lower side branches drooping, turning upwards at points ; Twigs smooth ; 

 Wood white, soft ; used for furniture, carving, and turnery. 



Synonymous with T. intermedia and T. europcea ; naturalised in Britain ; 

 the species most commonly planted ; some believed to be 900 years old. 

 Name Lime is corruption of "line," which is corruption of "lind"; "linden" 

 = the adjective. 



Nail-galls, looking like the points of tacks projecting through the leaves, 

 are produced by the larvae of a Mite (Erioplnjcs tilice) ; flower-bracts curled 

 and distorted by Eriophyes tiliarius. 



Class I Dicotyledons 



Division I ThalamiflorcB 



Natural Order . . . Rutacece 



Shrubs or trees, rarely herbs, with usually opposite, exstipulate leaves, 

 and usually hermaphrodite flowers, regular or irregular ; Sepals 3-5, free or 

 connate, imbricate ; Petals 3-5 or 0, hypogynous or perigynous, usually 

 imbricate, rarely valvate ; Stamens equal to or 2-3 times as many as petals, 

 inserted on a hypogynous disk ; Ovary superior, 2-5 carpels, distinct or 

 united, sessile or raised on a short gynophore ; Fruit a capsule or berry, 

 rarely a drupe, and in Ptelea a samara. 



HOP TREE, Ptelea trifoliata. 



Parks, open shrubberies, plantations or woods. May, June. Best in a 

 damp or rather shady spot. The peculiar winged fruit gives the tree a very 

 striking appearance after the flowering period. Layering of shoots may be 

 done at any time ; seeds are sown in a sunny position in March or April. 



Flowers greenish-yellow, polygamous, fragrant, in a compound cyme; 



pedicels pubescent, bracteolate ; Calyx 4-5-partite, pubescent ; Petals 4-5, 



pubescent, hypogynous ; Stamens 3-4, hypogynous, alternate with petals ; 



filaments pilose, short in female flowers; Ovary superior, 2-3-celled, puber- 



34 



