Am.  Jour.  Pharm. 
March,  19 19. 
Ballot  a  Hirsuta. 
153 
walls,  The  most  prominent  peculiarities  are  shown  by  the  trichomes 
which  thickly  cover  both  surfaces.  •  These  appear  nearly  equal  in 
number  as  outgrowths  of  the  epidermises.  Both  non-glandular  and 
glandular  types  are  represented.  As  for  Marrubium  vulgare,  so 
for  this  leaf,  the  non-glandular  trichomes  fall  into  three  categories, 
Fig.  6.  Non-glandular  hairs  from  calyx  of  Marrubium  vulgare.  A, 
many  branched  hair  with  somewhat  elongated  stalk;  B,  branched  hair  with 
short  stalk  and  few  branches ;  C ,  non-glandular  unicellular  hair.  (All  highly 
magnified.) 
viz. :  unicellular,  uniseriate,  and  branched.  The  unicellular  variety 
are  either  short  or  long,  straight  or  bent  over  toward  the  epidermis. 
The  individual  cells  of  the  uniseriate  hairs  form  distinct  articula- 
tions.   By  far  the  most  conspicuous  and  diagnostic  elements  are  the 
