20S 2o6 207 



Figs. 205-213. Forms of Underground Stems. 

 205, tubers of potato ; 206, thick rhizome of Iris ; 207, upright rhizome of violet ; 



208 



208, running rhizome of goldenrod; 209, corm of Trillium ; 210, longitudinal sec- 

 tion of a corm or solid bulb ; 



211, runner Or stolon of strawberry; 212, scaly bulb of tiger lily; 213, tunicated 

 bulb of onion. ' 



214 



215 216 217 



Figs. 214-218. Forms of Roots. 



218 



214, fibrous roots; 215, conical root; 216, napiform root; 217, tuberous roots, the 



individual roots fusiform ; 218, fibro-tuberous roots. 



392 



