^"''AiXis^s^''"'}     The  Botanical  Source  of  Jaborandi.  1 73 
The  stem  is  half  an  inch  in  diameter  near  the  root,  narrowing  to  a 
quarter  of  an  inch  in  the  upper  branches.  The  bark  is  thin,  of  a  grey- 
ish-brown color,  longitudinally  striated,  and  sprinkled  over  in  some 
specimens  with  a  number  of  white  dots  which  are  not  lenticels,  but  the 
remains  of  old  oil  receptacles.  The  bark  of  the  stem  is  thin  and  fra- 
gile, and  readily  scales  off  when  the  stem  is  broken  or  bent ;  it  has  a 
short  fracture,  and  is  yellowish-white  internally  ;  its  inner  surface  spar- 
kles with  minute  crystals  ;  it  has  not,  to  any  appreciable  extent,  the  pe- 
culiar leguminous  taste  of  the  root.  The  wood  of  the  stem  is  yellow- 
ish-white and  remarkably  fibrous.  The  stem  is  alternately  branched  at 
a  very  acute  angle  (about  20°),  the  branches  being  erect  and  furnished 
with  alternate  leaves.  The  leaves,  one  of  which  is  represented  in  fig. 
I,  are  imparipinnate,  about  nine  inches  long,  with  from  three  to  five 
pairs  of  opposite  leaflets,  which  are  articulated  to  the  rachis  and  have 
very  short  slighty  swollen  petiolules,  those  of  the  upper  leaflets  are  about 
one  line  long,  those  of  the  lowest  leaflets  about  three  lines  long,  and 
the  terminal  one  has  a  petiolule  from  half  to  one  inch  long.  The  rachis 
of  the  leaf  is  swollen  at  the  base.  The  pairs  of  leaflets  are  usually 
about  \  \  inch  apart,  the  lowest  pair  being  about  four  inches  from  the 
base  of  the  rachis. 
The  leaflets  are  very  variable  in  size,  even  on  the  same  leaf.  Their 
general  outline  is  oblong-lanceolate.  They  are  entire  (fig.  2),  with  an 
emarginate  or  even  retuse  apex,  and  an  unequal  base.  Their  texture  is 
coriaceous,  and  when  moistened  reminds  one  in  size  and  thickness  of  the 
leaf  of  the  cherry  laurel.  The  veins  are  prominent  on  both  sides  of 
the  leaf,  and  branch  from  the  midrib  at  an  obtuse  angle  (about  60°)  in 
a  pinnate  manner,  remaining  distinct  until  within  one  quarter  of  an  inch 
of  the  margin  of  the  leaf,  where  they  become  lost  in  the  network  of 
veinlets.  The  midrib  is  scarcely  prominent  on  the  upper,  but  forms  a 
distinct  keel  on  the  under  surface  of  the  leaflet.  When  held  up  to  the 
light  the  leaflets  are  seen  to  be  densely  pellucidly  punctate.  These 
pellucid  dots,  which  are  receptacles  of  secretion,  are  not  arranged,  as 
in  another  kind  of  jaborandi,  in  lines  along  the  veinlets,  but  are  irregu- 
larly scattered  all  over  the  leaf,  and  appear  equally  numerous  in  every 
part ;  they  are  mostly  rather  large,  but  vary  a  little  in  size.  The  whole 
plant  is  glabrous. 
I  may  remark  here  that  there  appears  to  be  two  varieties,  if  not  spe- 
cies, of  this  Pilocarpus^  the  one  being  perfectly  smooth  in  every  part,  as 
above  described,  and  the  other  having  the  stems,  petioles,  and  under 
