Am.  Jour.  Pharm.  \ 
March,  19 19.  J 
Ballota  Hirsuta. 
151 
The  branched  trichomes  are  of  two  kinds,  viz.:  (i)  those  that 
project  directly  out  of  slightly  elongated  epidermal  cells  and  which 
are  two  to  three  branched  and  (2)  those  which  consist  of  a  more 
or  less  elongated  central  multicellular  stalk  with  radiating  branches 
(Fig.  4).  As  many  as  fifteen  branches  have  been  observed  on  this 
type.  Of  these,  those  emanating  from:  the  base  of  the  stalk  are 
unicellular,  and  more  frequently  curved  than  straight,  while  those 
Fig.  5.  Various  types  of  hairs  found  on  Marrubium  vulgare.  a,  b,  c,  d, 
t>  f,  9>  h>  glandular  hairs,  and  i,  non-glandular  two-celled  hair,  all  found  on 
the  foliage  leaves  and  calyxes ;  /,  curled  unicellular-non-glandular  hair,  a  type 
abundantly  found  on  the  stem  that  gives  to  this  part  its  white-woolly  appear- 
ance, a,  d,  f,  glandular  hairs  with  a  one-celled  stalk  and  a  one-  to  two-celled 
head;  b,  c,  e,  glandular  hairs  with  two-celled  uniseriate  stalk  and  1-2-celled 
head,  the  distal  cell  of  the  stalk  being  considerably  shortened  and  forming 
the  "  neck  cell " ;  g,  side  view,  and  h,  view  from  above  of  large  balloon-shaped 
glandular  hair  with  one-celled  stalk  and  8-celled  head.  (All  highly 
magnified.) 
issuing  from  points  higher  up  are  either  unicellular  or  two-  or  three- 
celled,  the  distal  cell  of  these  last  being  characteristically  long, 
pointed  and  curved.  The  central  stalk  of  the  branched  trichome 
does  not  usually  attain  the  great  length  of  the  similar  part  of  the 
branched  trichome  of  Ballota  hirsuta. 
