ARRANGEMENT OF FLOWERS ON THE STEM 189 



B 



FIG. 133. Head of Yarrow. 



A, top view. (Magnified.) B, lengthwise section. (Magnified.) re, receptacle ; i, 

 involucre ; r, ray-flowers ; d, disk-flowers ; c, corolla ; s, stigma ; ch, chaff, 

 or bracts of receptacle. 



FIG. 134. 

 Panicle of Oat. 



FIG. 135. Compound Umbel 

 of Carrot. 



