40 



ROSACEA 



11. Agrimonia. — Sepals 5; petals 5; sta??iens 12—20; 

 achenes 2. 



12. PoTERiUM. — Sepals 4; /^/^/V absent; stamois 20 — 30; 

 achenes 2 — 3 ; some flowers unisexual. 



13. Sanguisorba. — Flowers perfect; sepals \\ petals absent; 

 stamens 4; achenes i — 2. 



Tribe 6. Rbsece. — Petals 5 : carpels inan)\ i-seeded, enclosed in 

 the large fleshy calyx-tube. 



14. Rosa. — Sepals 5 ; petals 5 ; sta7nens indefinite. 



pRrxus spin6sa {Sloe or Blacktlwtn). 



Tribe 7. Pbmece. — Petals 5: carpels i — 5, i — 2-seeded : fruit a 

 pome. 



15. Pyrus. — Fruit 2 — 5-chambered ; chambers 2-seeded; c&r^ 

 homy, enclosed. 



16. Mespilus. — Fruit 5-chambered; chambers i -seeded ; core 

 bony, exposed. 



17. Crataegus. — Fruit 1 — 5-chambered; core stony. 



18. Cotoneaster, — Fruit 2 — 5-chambered; core stony, pro- 

 jecting. 



