20 BULLETIN" 223, IT. S. DEPARTMENT OF AGEICULTUBE. 



The antrorse pinna? comprise froni 34 to 42 per cent of the whole 

 number, the retrorse class furnishing from 31 to 36 per cent, while of 







/20 



joa 



se 



73 



GO 



Fig. 11. — Cross sections of the rachis of a Deglet Noor date leaf, showing outlines at different distances from 



base to apex. 



the introrse pinnae there are but 15 to 25 per cent. Unclassified 

 basal spines make up the balance. 



