78. AMENTIFERJ3. 375 



U. montana (With.) ed. viii. [J7. major (Sm.) is a large and rough- 

 leaved form with corky growths on the branches, and U. montana var. 

 nitida (Sy.) has 1. shining and glabrous]. Branches largo spreading. 

 L. broad. Fr. Hoplike. Woods and hedges. T. III. IV. 

 Wych Elm. E. S. I. 



Order LXXVIII. AMENTIFE1LE. 



Fl. monoecious or dioecious, rarely perfect. Barren fl. of all 

 our plants in catkins ; sometimes with a membranous pe- 

 rianth. Fertile fl. clustered, solitary or in catkins. Ovary with 

 one or several cells. Stigmas 1 or more. Fruit as many as 

 the ovaries, bony or membranous (or drupaceous in Myrica). 

 Albumen usually wanting. Embryo straight or curved, plain, 

 Kadicle mostly superior.: Young leaves with stipules. 



Subord. I. SALICINEjE. Dioecious. Fl. all in catkins. 

 Fr. naked, 2-valved, 1-celled, many-seeded. Seeds erect, 

 hairy. 



1. SALIX. Catkins consisting of imbricate entire scales. 

 Stam. 1 5. Fr. a 1-celled pod with 1 2 glands at its 

 base. Perianth 0. 



2. POPULUS. Catkins with slashed scales. Stain. 4 30 

 from a little oblique cupshaped perianth. Fr. alniO3t 2-celled, 

 with a cupshaped perianth. 



Subord. II. MYRICEM. Dioecious. FL in catkins. Fr. 

 drupaceous surrounded by scales become fleshy and adhe- 

 rent to the ovary. 



3. MYBICA. Catkins with concave scales. Stam. 4 8. 

 Stigmas subulate. Drupe 1-celled, 1-seeded. Perianth 0. 



Subord. III. BETULINEJE. Monoecious. Fl. all in catkins. 

 Ovary 2-celled, each with 1 ovule. Fr. naked, indehisceut, 

 1-celled, 1-seeded. Seeds pendulous, not hairy. 



4. BETULA. Scales of the barren catkins ternate, the middle 

 one bearing the stamens. Perianth 0. Scales of the fertile 

 catkin 3-lobed, 3-flowered, membranous, deciduous. Styles 

 2, filiform. Fr. with a membranous margin. 



5. ALNUS. Scales of the barren catkins 3-lobed, 3-flowered. 

 Perianth 4-parted. Scales of the fertile catkin ovate, 2- 

 flowered, coriaceous, persistent. Styles 2. Ovary com- 

 pressed, 4 minute scales at its base. . Fr. not winged. 



