ROSACEA loi 



1 8. Crat^gus, L. 



Flowers small; leaves simple, lobed or pinnatifid; 

 fruit a 1-5-celled drupe; branches ending in a spine. 



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

 common. C. monogyna^ J acq. ; carpel i ; not so common. 



19. COTONEASTER, L. 



Flowers small ; leaves coriaceous, simple ; fruit a small 

 pome with 2-5 i -seeded stones. 



C. vulgaris^ 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. 



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

 seeded pome. 



A. rotundifolia, Pers. {Ainelanchier vulgaris^ Moench.;, 

 Snowy Medlar; leaves ovate, obtuse, downy beneath, 

 ultimately glabrous, fruit blue-black; rocky mountain 

 slopes, local; Alps, Jura, Pyrenees. 



Order XXX.— SAXIFRAGACEiE. 



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. 



