KEY 123 



55, Petals oblong-spatulate. Styles 5. Flowers racem- 

 ed, white. Leaves simple, sharply serrate. Fruit globular, 

 eatable, purplish. Amelanchier. 



Petals roundish. Flowers corymbed. Styles 1-5. . .56 



56. Carpels 1-seeded. Styles 1-5. Flowers w^hite, rare- 

 ly rose-color. Leaves simple, sometimes lobed. Armed with 

 thorns. Crataegus. 



Carpels 2-seeded. Styles 2-5. Flowers white, or 

 rose-color. Leaves simple or pinnate. Unarmed. Pyrus. 



S7» Sepals and petals numerous, in several rows, all 

 united at the base in a fleshy cup, beset with leaf -like bract- 

 lets. Pistils few or many, enclosed by the calyx-tube, 

 which becomes in fruit a sort of liuge rose-hip. Leaves oval, 

 chiefly acuminate, tomentose beneath. Flowers lurid, pur- 

 ple on short branches. Shrub exhaling the fragrance of 

 strawberries. Calycanthus. 

 Segments or pieces of the perianth definite 58 



58. Fruit a follicle. Pistils 3-12. Calyx 5-cleft. Pe- 

 tals 5. Flowers (rarely 4-merous) white or rose-color, some- 

 times dioecious, corymbed or panicled. Shrubs or herbs. 



Spiraea (882). 



Fruit an achenium. Pistils 2-50, free, in an open, or 



closed calyx 59 



59. Achenia, dry or pulpy, in an open calyx 60 



Achenia enclosed in the calyx-tube, which becomes 

 fleshy in fruit. Plants shrubby and prickly. Leaves odd- 

 pinnate. F.osa. 



60. Styles deciduous 61 



Styles persistent on the dry achenia 65 



61. Calyx bractless, or minutely bracteoled, deeply 

 parted 62 



Calyx very conspicuously bracteolate (apparently 10- 

 lobed) 64 



6S. Fruit a congeries of pulpy achenia on a spongy or 



succulent receptacle. Herbaceous, or somewhat shrubby, 



with or without prickles. Rubus (880). 



Achenia dry or dryish 63 



