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. ROSEvE. Fruit formed of many small dry nuts in- 

 closed in the fleshy tube of the calyx. 



14. Rosa. CaZ. urceolate, contracted at the mouth, aWma^eZ!/ 

 fleshy, 6-fid. Pet. 5. Stam. many, inserted with the petals 

 on the rim of the tube of the calyx. 



Suborder III. POME^. 



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

 pome. . 



15. Crat^gus. Calyx-segments 5, acute. Pet. 5. Styles 

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

 1 — 5 bony 1— 2-seeded carpels. 



16. CoTONEASTER. Calvx-segmcnts 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 6, 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 2—6. Fr. 

 fleshy loith 6 cartilaginous or membranous distinct 2-seeded 

 cells. Testa cartilaginous. 



Suborder I. Amygdalem. 



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. — 13. 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. 1/83. — 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. 



