KEY TO THE FAMILIES 283 



FP. Blossoms perfect and not in catkins, or sometimes 

 imperfect and in short catkins, but the fruit 



not a nut : trees, shrubs, or herbs 



VIII. Urticacece, p. 301 

 FFF. Blossoms perfect, not in catkins: fruit an akene: 



herbs IX. Polygonacece, p. 304 



EE. Flowers characteristically polypetalous, mostly larger 

 and often showy (Polypetalce] . Some of the Ra- 

 nunculacese here described are apetalous, but 

 there is a calyx-like involucre underneath the 

 flower. 

 F. Petals and stamens borne on the not-enlarged torus 



(hypogynous) : ovary superior, 

 o. Leaves opposite at swollen nodes, very narrow, 



often grass-like X. Caryophyllacefe, p. 306 



GG. Leaves alternate or opposite, mostly broad, not 

 grass-like, the nodes usually not conspicu- 

 ously swollen. 



H. Carpels solitary or distinct (i. e., ovary sim- 

 ple) XI. Ranunciilacece, p. 308 



HH. Carpels variously united (ovary compound). 



I. Stamens 6: fruit a silique or silicle 



XII. Cruciferce, p. 310 



II. Stamens numerous : fruit various 



XIII. Malvaceae, p. 312 



FF. Petals and stamens borne on a disk or rim sur- 

 rounding the pistil : ovary superior. 



G. Herbs XIV. Geraniacew, p. 313 



GG. Trees or shrubs XV. Sapindacece, p. 315 



FFF. Petals and stamens borne on the calyx or on a hol- 

 low calyx-like torus. 

 G. Ovary superior, except in the pear tribe (Rosaceae) 



H. Fruit a legume XVI. Legtiminosce, p. 316 



HH. Fruit not a legume: stamens 20 or more 



XVII. fiosacece, p. 319 

 GG. Ovary distinctly inferior. 



H. Flowers corymbose or paniculate, showy 



XVIII. Saxifragacece, p. 323 



HH. Flowers in umbels, small.. XIX. Umbelliferce, p. 325 

 DD. Gamopetalae: corolla in one piece, at least towards the 



base (as if petals were more or less united). 

 E.; Ovary superior. 



F. Fruit of 4 nutlets, produced from a 4-lobed ovary... 



XX. LaUatw, p. 326 



FF. Fruit not a nutlet, usually capsular ( sometimes a berry) . 

 G. Corolla regular. 



