i66 



DICOTYLEDONS 



distinctly seen in some other species of Chrysanthemum, the 

 straps of which have three terminal teeth. The straps of 

 the Sunflower and Daisy are not toothed at their ends. Thus 



Figs. 209-212. — Sunflower. Fig. 209. — Ray-fiower. Fig. .210. — Disk-flower. Fig. 211. 

 — Vertical section of Disk-flower. Fig. 212. — Vertical section of achene : /c=pericarp ; 

 /j=testa; C(7^ = cotyledons ; r=radicle. 



the strap of the Dandelion represents five joined petals, and 

 the flower may be described as a true ligulate (strap-like) 

 flower; whereas the strap of the corolla belonging to the ray- 

 flowers of the three other types represents only a part of the 

 corolla (three petals), and may be referred to as Si. false ligulate 

 flower. The ray-flowers of all three types possess no stamens ; 

 in the two Daisies they have a gynsecium, and are therefore 

 carpellary flowers : but in the Sunflower they have no style and 

 stigma, though an empty ovary-tube is present. 



We note each disk-flower of the Sunflower arises in the axil 

 of a scale-like bract (figs. 208, 210 b); whereas the inflor- 

 escence-receptacle of the two Daisies, like that of the Dande- 

 lion, only has those bracts which form the involucre. 



