554 
Root- Structure  of  Spigelia  Marilandica. 
Am.  Jour.  Pharm. 
December,  1906., 
would,  indeed,  be  very  strange  if  a  single  species  of  a  family  that 
contains  about  150  species,  should  possess  such  marked  characteris- 
tics unknown  from  any  of  the  others.1 
Fig.  i. 
Fig.  2. 
Fig.  1.  Ruellia  ciliosa,  Pursh.  The  rhizome  of  an  old  specimen  showing 
the  basal  portions  of  the  aerial  shoots  still  attached  (St. ).  This  rhizome  shows 
several  stretched  internodes  and  some  very  short  ones  at  the  base,  both  forms 
often  occurring  at  the  same  time  in  this  species  ;  natural  size. 
Fig.  2.  Longitudinal  section  of  the  same  root,  showing  a  stone-cell. 
X480. 
From  this  point  of  view  the  writer  wishes  to  present  a  few  data 
about  the  root-structure  of  Phlox  ovata,  and   to  demonstrate  that 
1  After  this  paper  had  been  written  I  happened  to  see  an  article  about  the 
same  subject  by  Mr.  W.  W.  Stockberger  in  Proc.  Am.  Pharm.  Assoc.,  1905,  p. 
324,  who  has  reached  the  same  conclusion. 
