(;^\^^I.l• wn mauioi.a. 



203 



less, reaciiiiiji; out to co\cr a circle ot two meters' radius. From 

 these arise the new shoots, removed from the parent plant 

 often more than a meter, and in many instances so resembling 

 seedlings in habit that it is only by removing them that their 

 true origin may be determineci. JVIore frequently, ho\ve\er, 

 two to se\eral retonyos arise at one point, when their nature 



1 1 



E 



B 



K 



>I 



Fis. 6. — Retonyos of suayule ( Paithenium argentatum Gray.) A About 

 nine years old. B. Retonyo wliicli lias developed after the manner of a 

 seedluiK. and of slow growtli. 8 years. C and D, 4 years. In both these the 

 proximal portion of the root has already disappeared. E and P, 3 years. 

 a. 4 years. H and I. 2 years. K and l^. two to four months. At the upper 

 right hand a small seedling is introduced to show the contrast of root system. 



may be guessed at by the several closely placed main stems, 

 or by the line of apparently independent plants. These dif- 

 ferences are shown in the photograph. 



