132 Cupuliferae — Betulaceae. 



ll.—QUERCUS. 



QUER'CUS RO'BUR (105). Oak. 4—5. Leaves obovate-oblong with 

 (1277) a sinuate margin sessile or petiolate, staminate flowers in lax pendu- 

 lous catkins, pistillate flowers solitary, ovary 3-celled, stigmas 3, 

 fruit a I -seeded acorn seated in the cupule of imbricated bracts. 

 Woods. 



III.— CORYLUS, 



CORY'LUSAVELLA'NA(iii). Hazel. 3—4. Leaves orbicular cordate 



(1276) acute doubly serrate, staminate flowers in cylindrical catkins with 3- 



lobed bracts, pistillate flowers many enclosed in a small sessile scaly 



bud, stigmas 2, fruit a woody nut enclosed in a lobed and laciniate 



involucre. Woods, 



V7.—CARPINUS. 



Carpi'nus Bet'ulus (35). Hornbeam. 5 — 6. Leaves elliptical ovate doubly 

 (1275) serrate hairy beneath, staminate flowers in pendulous catkins with 

 ovato-lanceolate bracts, pistillate flowers in lax cones, fruit woody 

 enclosed in the leafy lobed bract. [G. M. W. Tb. F. C. CI. St. 



ORDER 69. — Betulaceae. 



Flowers achlamydeous monoecious in short cylindrical catkins. Stamens 

 4 — 12 distinct. Ovary superior 2.celled. Style i or none. Stigmas 2. 

 Fruit indehiscent membranaceous not enclosed by bracts. Leaves alternate 

 with deciduous stipules. 



Stamens 4, fruit not winged, ...... Alnus L 



Stamens 8— 12, fruit winged, Betula H. 



I.— ALNUS. 



AL'NUS GLUTINO'SA (109). Alder. 3—4. Scales of the fertile 



(1274) catkin woody persistent, leaves obovate cuneate green on both sides 



sinuate serrate. A small tree with black bark. Wet places. Fig. p. 120. 



II.— BETULA. 



BET'ULA AL'BA (107). Birch. 4—5. Scales of the fertile catkins 



(1271) deciduous, leaves ovate somewhat triangular doubly serrate, fruit 



(1272) orbicular broadly winged. A tree 40 — 50 ft. with silvery white bark 

 Woods. 



