APPEXDTX I 



359 



Pio. 8. Head of Yarrow. 



A, top view (magnified); B, lengtliwise section (magnified), re, re- 

 ceptacle; i, involucre; r, ray-flowers; d, disk-flowers; e, corolla; 

 s, stigma; ch, chaff, or bracts of receptacle. 



Fig. 9. A, Panicle of Oat ; B, Compound Umbel of Carrot. 



