ROSACES 10 1 



1 8. CRAT^GUS, L. 



Flowers small; leaves simple, lobed or pinnatifid; 

 fruit a i-5-celled drupe ; branches ending in a spine. 



C. oxyacantha, L., Hawthorn, Whitethorn ; carpels 2-3 ; 

 common. C. monogyna, Jacq. ; carpel I ; not so common. 



19. COTONEASTER, L. 



Flowers small ; leaves coriaceous, simple ; fruit a small 

 pome with 2-5 I -seeded stones. 



C. vulgarisy Lindl. ; flowers 1-5, calyx nearly glabrous ; 

 rocky mountain slopes, not uncommon. C. tomentosa, 

 Lindl. ; flowers 3-8, calyx downy ; rocky places, local. 



20. ARONIA, Pers. 



Flowers in erect racemes, white ; fruit a 5 -celled 3-5- 

 seeded pome. 



A. rotundifolia, Pers. (Amelanchier vulgaris, Moench.), 

 Snowy Medlar; leaves ovate, obtuse, downy beneath, 

 ultimately glabrous, fruit blue-black; rocky mountain 

 slopes, local ; Alps, Jura, Pyrenees. 



Order XXX. SAXIFRAGACE.E. 



Flowers regular; calyx 5 -lobed; petals 5 ; stamens 

 usually 10; ovary usually half-inferior and 2-celled ; 

 fruit a 2-4-celled capsule. A large order, almost en- 

 tirely confined to the Arctic and Northern Temperate 

 Zones. 



