Am.  Jour.  Pharm.  \ 
March,  19 19.  J 
Ballot  a  Hirsuta. 
155 
A  form  of  branched  trichome  has  been  observed  by  the  writer 
that  stands  out  preeminently  as  constituting  the  most  easy  and  prac- 
tical histologic  means  of  distinguishing  Ballota  hirsuta  from  Marru- 
bium  vulgare.  This  trichome  resembles  the  other  branched  forms 
seen  in  Ballota  but  differs  from  these  is  respect  to  the  central  branch 
which  has  a  two- four  celled  uniseriate  stalk  and  a  glandular  head 
of  one  or  two  to  four  cells  (Fig.  8,  A). 
The  glandular  trichomes  exhibit  various  forms  (Fig.  9)  viz.: 
(a)  short  one-celled  stalk  and  small  unicellular  head;  (b) short  uni- 
cellular stalk  and  large  four  to  eight-celled  balloon-shaped  head ;  (c) 
Fig.  8.  Types  of  branched  hairs  found  on  the  foliage  leaves  and  calyxes 
of  Ballota  hirsuta.  The  illustration  to  the  left  shows  one  of  these,  the  central 
branch  of  which  is  longer  than  the  rest  and  bears  a  glandular  head  at  its 
summit.    (Highly  magnified.) 
long  one-celled  stalk  and  small  spheroidal  unicellular  head;  (d)  long 
one-celled  stalk  and  elongated  unicellular  head;  (e)  one-celled  stalk 
and  two-celled  head;  (/)  short  two-celled  stalk  and  two-celled  head; 
(g)  long  two-celled  stalk,  the  distal  cell  ("neck  cell")  being  shorter 
than  the  proximal  one  and  bearing  a  one-celled  head.  Many  of  the 
hairs  have  their  basal  portions  lignified.  These  take  a  pinkish  to 
reddish  coloration  with  phloroglucin  and  concentrated  hydrochloric 
acid. 
The  calyx  of  Ballota  hirsuta  shows  a  microscopic  structure  simi- 
