152 Key to the System of 



OXAX.XS. 



739. Petals white. 



Stemless ; root creeping ; leafstalks much elongated, at 

 the base oval and membranous; leaflets three, broadly 

 obcordate ; flowerstalks reaching beyond the leaves ; 

 flower single ; sepals oval ; fruit ovate-globular, glabrous ; 

 seeds nearly always solitary in each cell. ' ' Wood-Sorrel." 



O. Magellanica. 



Petals yellow. 



Stem developed ; leafstalks elongated, at the base slightly 

 dilated ; flowers in an umbel or reduced to two or one ; 

 sepals elliptic-lanceolar ; fruit cylindrical, pointed, beset 

 with hairlets ; seeds several in each cell. 



O. corniculata. 



PELARGONIUM. 



740. Stem very abbreviated. 



Root turgid, generally short; leaves radical, rhomboid- 

 ovate ; flowers comparatively large ; petals rose-colored. 

 Figure 18. P. Rodney anum. 



Stem nearly always elongated. 



Herbaceous ; root slender or rather long ; leaves almost 

 cordate or somewhat renate or orbicular, lobeless or 

 short-lobed ; umbels usually many-flowered ; involucrating 

 bracts small, membranous ; flowers comparatively small ; 

 nectar-tube short ; petals often pink or pale. 



P. Australe. 



GERANIUM. 



741. Stem elongated. 



Root often tuberous ; leaves in outline cordate- or renate- 

 orbicular, deeply five- to seven-cleft, the main-segments 

 slit again into three or more broad-linear or semielliptic 

 lobes ; sepals short-pointed ; petals small, pink ; fruitleta 

 without wrinkles ; seeds outside reticulated. (Name now 

 re-adopted more exact than that of G. Carolinianum and 

 G. dissectum.) G. pile sum. 



Stem very abbreviated. 



An alpine herb ; leaves crowded, almost radical, divided 

 into narrow segments and lobes ; sepals long-pointed ; 

 petals small, pink ; seeds almost smooth. 



G. sessiliflorum. 



