DICOTYLEDONS. ULMACE.^-. Ulmuf:. 201 



I. A. glutinosay leaves roundish cuneiform obtuse lobed at the 

 margin and serrated somewhat glutinous downy in the axils of 

 the leaves beneath, p. 271. — Bogs. 

 4. BETULA. 



Monoecious. Catkins cylindrical. Barren Fl. ternate upon the 

 scale. Perianth 0. S(am. 8—10. Fertile Fl. Scale of the 

 catkin imperfectly 3-lobed, 3-flowered. Perianth 0. St7/les 

 2. Ovaries compressed, 2-ceIled, I abortive. ISfuis com- 

 pressed, with a membranaceous margin, 1-beeded. 



1. B. alba, leaves ovato-deltoid acute doubly serrated glabrous. 

 p. 274.— IVoods. 



2. B. nana, leaves orbicular crenate. p. 274. — Alpine bogs. 



5. MYPJCA^ 

 Dioecious. Catkins ovate, their scales lunulate. Barren Fl. 

 Stam.4 — 6. Anthers 4 -\?l\\'^(\. Fertile FL Ovary \. Stig- 

 mas 2. Drupe I -celled, 1 -seeded. Decand. 



1. M. Gale, leaves lanceolate broader upwards serrated, item 

 shrubbv. p. 288. — Marshes and wet moors. 



Ordeh IV. ULMACE.E. Mirbel. 



Flowers perfect, or imperfect by abortion. Perianth single, 

 bearing the stam., free, 4 — 6-toolhed. Stam.4 — 6. Ovary 

 1. Styles 2. Stigmas double. Achenium or Drupe 1 seeded. 

 Seed pendulous, with or without albumen. Embryo straight 

 or rolled up.. Radicle superior. 



Trees or Shrubs .Leaves simple, rough, alternate, with stipules. 

 Flowers axillary. Mirbel. 



1. ULMUS. 



Perianth persistent, 4 — 6-cleft. Fruit membranous, compress- 

 ed, 1 -seeded. 



1. U. campestris, leaves doubly serrated scabrous unequalat the 

 base, flowers nearly sessile 4-cleft, with 4 stam., fruit oblong 

 naked, p. 85. — Woods and hedges. 



2. U. glabra, leaves doubly serrated smooth unequal at the base, 

 flowers nearly sessile .5-cleft, fruit obovate naked cloven, p. 85. 

 — Woods and hedges. 



.3. U. montana, leaves doubly serrated pointed rough unequal at 

 the base, flowers on short stalks efifuse 5 — 6-cleft with 5-- 6 

 stam., fruit roundish naked, p. 85. — IVoods. 



This genus is considered the type of the order Mijricecc by M. Richard. 



