420 ARRANGEMENT OF THE GENERA 



Order XXV. RHAMNE^E. 



Calyx four- or five-cleft, valvate. Petals four or five, inserted into the 

 throat of the calyx. Stamens four or five, opposite to the petals. Ovary 

 wholly or in part superior, with two or four cells, and surrounded by a 

 glandular disk. Seeds solitary, erect. 



1. Rhamnus, 111,132. 



Order XXVI. LEGUMINOS^E. 



Calyx of four or five sepals, more or less united. Corolla papilio- 

 naceous (in all the British genera), inserted into the base of the calyx, 

 the odd petal superior. Stamens ten, monadelphous or diadelphous. 

 Ovary free, one-celled. Fruit a legume. 



I.UI1M - VlCIE.*. 



1. Ulex, 285, 288. 8. Vicia, 285, 292. 



2. Genista, 285, 287. 9. Lathyrus, 285, 291. 



3. Ononis, 285, 289. 10. Orobus, 285, 290. 



4. Anthyllis, 285, 289. HEDVSARE.B. 



5. Medicago, 285, 300. 11. Ornithopus, 285, 294. 



6. Trifolium, 286, 296. 12. Arthrolobium, 285. 294. 



7. Astragalus, 285, 295. 13. Hippocrepis, 285, 295. 



14. Hedysarum, 285, 295. 



Order XXVII. ROSACES. 



Calyx four- or five-parted, lined below with a disk. Petals five, 

 equal, inserted into the calyx. Stamens generally numerous, anthers 

 two-celled, opening longitudinally. Carpels many, rarely solitary, one- 

 celled, with one, two, or more seeds; styles simple, often lateral. 



AMTGDALEJE. 9. Sibbaldia, 114, 161. 



1. Prunus. 213, 214. 10. Potentilla, 214,223. 



SPIRX.X.. 11. Comarum, 214, 226, 



2. Spiraea, 213, 216. 12. Fragaria, 213,222. 



DKYADEJE. 13. Rubus, 213, 220. 



3. Dryas, 213,225. ROSKA 



4. Geum, 213, 225. 14. Rosa, 213, 217. 



5. Sanguisorba, 96, 103. POME.E. 



6. Poterium, 344, 362. 15. Mespilus, 213, 215. 



7. Agrimonia, 210, 211. 16. Pyrus, 213,215. 



8. Alchemilla, 96, 105. 



Order XXVIII. LYTHRARIE^. 



Calyx tubular, lobed. Petals deciduous, between the lobes of the 

 calyx. Stamens equalling the petals in number, or two, three, or four 

 times as many, and inserted into the tube of the calyx. Ovary free, 

 three- or four-celled, with a central placenta, and numerous seeds. 

 Capsule membranous, usually one-celled. 



1. Lythrum, 210, 211. 2. Peplis, 163, 175. 



Order XXIX. ONAGRARI^. 



Calyx tubular, adnate to the ovary entirely or in part, two- or four- 

 lobed. Petals as many as the lobes of the calyx, twisted, inserted at 

 the top of the tube. Stamens two, four, or eight, inserted with the 



