PRUNUS. 89 



13. GEUM. Cal. 10-cleft, in 2 rows, the outer parts smaller. 

 Pet. 5. Stam. many. Fr. of many small nuts, tipped 

 with the persistent jointed styles hooked at the joining. Re- 

 ceptacle elongated, dry. Seed ascending. 



Tr. IV. ROSE^E. Fruit formed of many small dry nuts in- 

 closed in the fleshy tube of the calyx. 



14. ROSA. Cal. urceolate, contracted at the mouth, ultimately 

 fleshy, 5-fid. Pet. 5. Stain, many, inserted with the petals 

 on the rim of the tube of the calyx. 



Suborder III. POME.E. 



Calyx-tube thick and fleshy, in fruit forming a 1 5-celled 

 pome. 



15. CRAT^GUS. Calyx-segments 5, acute. Pet. 5. Styles 

 1 5. Fr. oval or round, concealing the upper end of the 

 1 5 bony 1 2-seeded carpels. 



16. COTONEASTER. Calyx-segments 5. Pet. 5. Styles 2 5. 

 Fr. turbinate, its nuts adhering to the sides of the calyx but 

 not cohering at the centre. Stam. erect, as long as the teeth 

 of the calyx. 



17- MESPILUS. Calyx-segments 5, leaflike. Pet. 5. Styles 

 2 5. Fr. turbinate with the upper end of the bony carpels 

 exposed; disk dilated, almost as broad as the fruit. 



18. PYRUS. Cal. 5-toothed. Pet. 5. Styles 25. Fr. 

 fleshy with 5 cartilaginous or membranous distinct 2-seeded 

 cells. Testa cartilaginous. 



Suborder I. Amygdalea. 

 1 . PRUNUS Linn. 



* Young leaves convolute. 



1. P. communis (Huds.) ; ped. solitary or in pairs, 1. elliptic or 

 ovate-lanceolate rather downy beneath. a. P. spinosa (L.) ; 

 branches spinous, ped. glabrous, 1. usually glabrous, fr. globose. 

 E. B. 842. /3. P. insititia (L.); branches slightly spinose, ped. 

 and under-side of 1. usually downy, fr. globose. E. B. 841. 

 y. P. domestica (L.); branches without spines, ped. glabrous, 1. 

 hairy about the midrib beneath, fr. oblong. E. B. 1783. The 

 characters of these varieties are not constant: a. is usually a 

 shrub with crooked and much armed branches ; /3. is a taller 

 shrub with straight and slightly armed branches ; y. is a small 

 tree. Sh. IV. V. a. Sloe. Blackthorn. /3. Bullace. 



