THE ANGIOSPERMAE : STEMS 



Q19 



m^^r^is^j^ 



Mj Q<-'i.^mm^^?bs 



Fig. 901 . — Anemone japonica. Transverse section of stem showing 

 the monocotyledonous arrangement of vascular bundles in 

 the stem of a Dicotyledon. 



4. Ring Arrangement in Monocotyledons. A well-known case is that of 

 Tamus communis (Fig. 902), in whose stem internodes the bundles are all 



'>«wt&>*i'' 



Fig. 902. — Tamus communis. Transverse section of the 

 aerial stem showing ring arrangement of bundles in 

 a Alonocotyledon. 



peripheral, forming an irregular ring around a large pith. It is noteworthy 

 that Tamus has petiolate, net-veined leaves like those of a Dicotyledon. 



A bundle ring is also typical of Monocotyledons with tubular stems, 



