APIUM GRAVEOLENS 



455 



stylopodium, which is characteristic of the pistils of most umbel- 

 lifers, is inconspicuous in celery. In each locule, a single seed is 

 produced, and the schizocarp separates at maturity to produce two 

 one-seeded mericarps. 



ANATOMY 



The Fruit and Seed. — The schizocarp is flattened laterally and 

 the mericarps are pentagonal in transection. (Fig. i.t,i.. A, B.) 

 Winton (31) and Kondo (13) have investigated the histology of the 



Fig. x}!. a, diagrammatic side view of schizocarp; B, transection of mericarp; C, sec- 

 tion of fruit and seed coat through rib ; D, transection of fruit and seed coat through oil duct : 

 al g, aleurone granules; cm s, commissural surface; emb, embryo; end, endosperm; ep, outer 

 epidermis of fruit coat ; ?/»', inner epidermis of fruit coat; /r c, fruit coat ; o</, oil duct; rb, 

 rib; j c, seed coat ; sty, style; t^^j ^«, vascular bundle. (Redrawn and adapted from Kondo, 

 Ohara Institute.) 



fruit, which conforms in its general characters to the umbelliferous 

 type. The fruits are minute, somewhat broader than long, and the 

 mericarps have five rather pronounced primary corky ribs, each of 

 which is traversed by a fibro vascular bundle. In the intervals 

 between the ribs are one to three oil ducts, and there are two on the 

 commissural side of the mericarp. Kondo reports that he found 

 one oil duct in each interval in seven of the varieties investigated, 

 and in only two European types were two to three present in each 

 furrow. The pericarp, which consists of from seven to ten rows of 

 parenchymatous cells, is marked with delicate striations and papil- 



