206 



About the distribution of growth whorls among plants nothing 

 is to be said with certainty as yet. But it is not improbable that 

 growth whorls will prove also to be présent in several other plants. 



A similar case is described hyD ru de iorStyphelia verticillata^, the 

 whorls of it „stellen in Wirklichkeit nur dicht gedrângte Spiralen 

 mit zwischenstehenden, lang-blattlosen Stengelgliedern vor", so 

 that the ,,Blûtenâhren zahlreich aus mehreren, wie Stockwerke iiber- 

 einander gebauten Scheinquirlachseln gleichzeitig hervorbrechen." 



8. Summary. A budwith a crowded number of foliar primordia, 

 may develop into a shoot with more or less defined whorls of leaves 

 by the simple growth of certain zones of the stem, while other zones 

 remain short. This kind of whorl is heteromerous and the leaves 

 in a single whorl are not equidistant, and not placed ail at the same 

 level, but their insertions show more or less clearly the parastichies 

 of the original phyllotaxis. 



The above described whorls are termed growth whorls and 

 regularly occur in Lilium Alartagon, Fenila thyrsiflora, in several 

 Primula spp., m Polygonatum verticillatum and probably in many 

 other plants. 



Groningen, Botanical Laboratory 

 of the State University, Dec. 1921 . 



^ Engler u. Prantl, Die natiirlichen Pflanzenfamilien IV, 1, 68. 



