114 ROSACES. [PRUNUS. 



SERIES 2. Ripe carpels enclosed within the calyx-tube. 



TRIBE Y. POTERIE'-ffi. Petals 4, 5, or 0. Carpels 1-3; ovules 1 in each 

 carpel, erect or pendulous. Fruit of 1-3 achenes enclosed in the small 

 dry calyx- tube. 



Calyx 4-5-lobed, with 4-5 adnate bracts. Petals 8. Alcherailla. 



Calyx 5-lobed. Petals 5. Stamens 12-20 9. Agrimonia. 



Calyx of 4 petaloid lobes. Petals 0. Stamens 4-30 10. Poterium. 



TRIBE VI. RO'SE-flE, Petals 4-5. Carpels many ; ovules 1 in each carpel, 

 pendulous. Fruit of many achenes enclosed in the fleshy calyx-tube. 



11. Rosa. 



TRIBE VII. PO'ME-ffi. Petals 5. Carpels 1-5 ; ovules 2 collateral in each 

 carpel, erect or ascending. Fruit fleshy, 1- 2- or 5-celled. 



Fruit 2-5-celled,. cells with cartilaginous walls 12. Pyrus. 



Fruit a drupe with 1-5 included stones 13. Cratsegus. 



Fruit a drupe with 3-5 -exserted stones 14. Cotoneaster. 



1. PRUNUS, L. PLUM AND CHERRY. 



Shrubs or trees. Leaves alternate, simple, glandular-serrulate ; petiole 

 2-glandular. Flowers white or red, solitary corymbose or racemed, honeyed. 

 Calyx inferior, deciduous in fruit ; lobes 5, imbricate. Petals 5. Stamens 

 15-20, perigynous, filaments free. Carpels 1 ; style terminal ; ovules 

 2, collateral, pendulous. Drupe with an indehiscent or 2-valved, 1-seeded, 

 smooth, or rugged stone. Seed pendulous, testa membranous, albumen 

 scanty or 0. DlSTBlB. N. temp, regions, rare in the tropics ; species 80. 

 ETYM. The old Latin name. 



SECTION 1. Pru'nus proper. Leaves convolute in bud. Flowers solitary 

 or fascicled, appearing with the leaves or before them. Drupe glaucous. 



1. P. commu'nis, Huds. ; leaves ovate or oblong-lanceolate pubescent 



beneath when young, petals obovate-oblong, flesh of drupe adhering to the 



stone. 



Copses, hedges, &c., ascending to 1,300 ft. in Yorkshire ; Ireland ; Channel 

 Islands; fl. March-April. A small, rigid, much-branched shrub, 3-8 ft. ; 

 branches usually spinescent ; wood very hard and tough. Leaves petioled, 

 -2 in., variable in breadth, actiteness, and length of petiole. Flowers white, 

 shortly pedicelled, proterogynous. Petals variable in breadth. Drupe globose. 

 DISTRIB. The Sloe is confined to Europe, the Bullace extends to N. 

 Africa, and the Himalaya, 



P. COMMUNIS proper ; bark black, branches divaricate all spinescent, leaves 

 finely serrulate at length glabrous beneath, flowers -f in. diam. preceding 

 the leaves, pedicels solitary or in pairs glabrous, petals obovate, drupe \ in. 

 diam. black erect very austere. P. spinosa, L. From Sutherland southd. 

 Sloe, Blackthorn. 



Sub-sp. P. INSITI'TIA, L. ; bark brown, branches straight a few spinescent, 

 leaves larger broader more obtusely serrate pubescent beneath, peduncles 

 downy, petals broader, drupe f-1 in. diam. globose drooping black or 

 yellow. From Lanark southd., but doubtfully indigenous in many habitats 

 Bullace. 



