114 MISSOURI BOTANICAL GARDEN. 



is the haustorial cotyledon, with which numerous students, 

 beginning with Malpighi and Sachs, have familiarized us, 



somew 



section of the seed. In transverse section, this end of the 

 embryo is usually smaller than the radicular end. The 

 whole embryo measures about 2 mm. in length, of which 

 one-fifth is the hypocotyl. The radicle proper is scarcely 



mm 



form of the seed, as 



with the race. In Deglet Noor, the* outline is nearly circular, 

 but may be disturbed by a low, lateral ridge. This is very 



lobular 



OCCURRENCE AND DISTRIBUTION OF STARCH, TANNIN AND OIL. 



STARCH. 



be observed 





only during a relatively brief period of the earlier develop- 

 mental stages. Its appearance at all seems to be connected 



f 



ceeding pollination. 



d 



of the fruit, none appears at anv time 



Observations. 



Nondescript. May 16, unpollinated. Starch in the upper 



b 



bracts, and in all the parenchyma 



d their bases, and in the ventral i 



renchyma 



half. In the receptacle below the insertion of the pistils, but- 

 much less in a zone above the pedicel. Pistil: Rather 

 abundant in the basal part, becoming reduced in quantity 

 in the upper half, where it is of very minute grains. Sim- 

 ilarly minute grains in the ovule, in the funicle, outer and 

 especially in the inner integument. The amount of starch 

 is greater near the nucellus, becoming reduced to none 



toward the periphery. There is no starch in the 

 idioplasts in the carpel or elsewhere. 



