XL VI. ROSACE.E 277 



Ordeh XLVI. ROSACEA. Gen. PL i. 600. 



Herbs, shrubs or trees, 1. stipulate, alternate, rarely opposite, simple or com- 

 pound. Fl. as a rule regular and bisexual : calyx gamosepalous, free or adnate 

 to ovary, lobes 5, imbricate in bud. Disk annular or lining the calyx-tube ; 

 petals 5, perigynous, rarely wanting, often orbicular and concave, deciduous, 

 claws short or none, imbricate, rarely contorted in bud. Stamens as a rule 

 numerous, inserted with the petals or on the disk, incurved in bud. Carpels 

 usually distinct, one or more, often adnate to calyx-tube, styles free or connate, 

 ovules in each carpel 1 or 2, rarely more. Fruit often fleshy. Albumen none or 

 scant}', cotyledons plano-convex, cells filled with oil, radicle short. 



Apart from medullary rays, parenchyma does not form an important part in the 

 wood of Rosacea. Chrysohalaneoz (Parinarium, Parastemon) are exceptional, they have 

 narrow tangential bands of parenchyma in the wood. In this respect, as well as in the 

 more or less zygomorphic ft., this tribe approaches Leguminosee. Wood fibres in 

 Rosacea- as a rule have not bordered pits. As far as known, the wood of the climbing 

 Bpecies has a normal structure. 



A. Ripe carpels 1 1 ■ »t enclosed within the calyx-tube. 



(See Neillia and Spiraea canescens.) 

 I. Leaves simple, quite entire. Carpel one. Fl. usually zygomorphic (tribe 



I 'h rusiilialaiH tf i. 

 Calyx-tube elongate, stamens G-30, usually 



unilateral 1. Parinakium. 



Calyx-tube short, stamens 2 .... Parastemon (p. 278). 



II. Leaves simple, serrate. Carpel 1. rarely 2. 

 I 'alyx 5-lobed, pet a Is large. 



Style terminal, stone hard, bony . . .2. Prunus. 



Style basal, endocarp coriaceous ■ • . '■'<■ PriNSEPIA. 



i 'a lyx 5-10-toothi'd. petals minute or 0. 



Carpels 1 or 2, stone hard, bony . . . Maddenia (p. 281 



Carpels 1, endocarp coriaceous . . . .4. Pygeum. 



III. Leaves simple or < [pound. Calyx without bracts. 



Carpels 1-8, ovules 2 or more, fr. dry. 



Sc-ds linear, testa membranous, albumen Oor 



scanty 5. Spiiixa. 



S Is globose, testa crustaceous, albumen 



copious Neillia (p. 288). 



Carpels x , ovules 2, fr. usually lleshy . . (>. lii la s. 



I V. Leaves usually compound, calyx bracteolaie. I'c_ . 1 1\ PoTENTILLA (p. 287) 



I'.. It ipc carpels enclosed u it liin the calyx-tube. 



I. Carpels r. free, when ripe enclosed in the fleshy 



calyx-tube 7. Rosa. 



II. Carpels connate, forming a 1 5-celled ovary, more or less adnate to calyx- 

 tube, which in fruit is fleshy, enclosing them. 

 ( (vary 5-celled, :i or more ovules in each cell. 



:'. o. u les in each cell 8. Dooyhia. 



Mo n\ oi ules in eacl II 9. Cydonia 



Ovarj 2 5-celled, 2 ovules in each cell. 

 Ovary 5-celled, fl. panicled .... L0. Eriodotrya. 

 Ovary 2 5-celled, fl. corymbose or Fascicled, 



Fr, 2 5 ceUed, 11. Pyros. 



Drupe with 5 dehiscent stones . . . 12. Stranv-ksia. 



Ovai \ _' 8 celled, endocarp I bin. 



Testa cori as or membranous . . . 18. Photinia. 



Testa thick, retioolatelj laci se . .14. Poub.tiii.sa 



Ovary 2 5-celled, drupe with I 5 bon j stones (pyrenes), 

 Leaves out, toothed or serrate . . ■ L6. Ckat/kods. 



Leaves quite entire L6. C nbasteb 



Leaves imparipinnate Osteomkles (p. 296.) 



