296 BOTANICAL GAZETTE [ Ami 



layers are numerous, forming a tissue as thick as the perisperm. 

 The outer polygonal cells are of the kind described for other specie^ 

 and the inner layers consist of extremely thin-walled parenchyma. 



(fig 



j 



tion. 



SlCYOS ANGULATUS L 



Sicyos angulatus L. is a native of northeastern United State- 

 occurring as a weed in damp places, and is also occasionally cultivated 

 for arbors. 



& v * .v small 



cm 



in 



length), filled with a single seed, are borne in capitate clusters on a 



Fig. 26.— Sicyos angulatus L. Base of prickle in cross-section, showing 



har- 



acteristic small cells. X 160. 



long peduncle. They are dry and covered with deciduous barf* 

 prickles, 8-io mm long, which give them a burrlike appearance. 



Tho W, J. . , ., 1 --mrnKmad. flattcntfl- 



ovate, smooth, and lustrous. 



Pericarp (figs. 26-29).— This coat forms only a very thin cover 

 ing for the seeds and does not make up the bulk of the fruit, as 



