PLATE XXVII 



Sambucus cerulea (51a and 51b) and 



Sambucus racemosa (52a and 52b) 



Vessels present; vessels commonly in radial multiples; often 

 spring wood vessels are closely spaced singles or in irregular 

 clusters (some appearing as subdivisions of a single vessel), 

 the vessels progressing toward formation of radial multiples 

 from early to late wood; vessel perforation plates simple; rays 

 composed of both procumbent and upright cells; rays two to 

 four cells in width . 



