AmAp°rif  Ss6arm'}  Materia  Medica  of  the  Mexican  Pharmaeopoeia.  171 
Yerba  del  sapo,  Eryngium  amethystinum,  Lin.,  E.  comosum,  La- 
roche,  E.  Cervantesii,  Lar.y  E.  subacaule,  Cavanilles,  and  other  indige- 
nous species  of  Eryngium;  Unibelliferse.  The  roots  are  considered 
to  be  diaphoretic  and  emmenagogue. 
Yerba  del  tabardillo,  Piqueria  trinervia,  Cavanilles;  Composite; 
in  the  Mexican  valley,  Puebla,  etc.  The  infusion  of  the  plant  is 
stimulant  and  febrifuge. 
Yerba  de  la  vibora,  Y.  viperina,  Myriadenus  tetraphyllus,  De 
Cand.;  Leguminosse;  in  the  State  of  Jalisco,  in  Jamaica,  etc.  The 
gum  produced  from  this  plant  is  antiperiodic. 
Yerba  del  zopilote,  Acourtia  moschata,  De  Cand.;  Composite;  in 
Morelia.  Used  as  a  tonic  and  stomachic.  Perezia  moschata,  La 
Llave  et  Lejarza,  is  known  by  the  same  common  name. 
Yerba  del  zorrillo,  Croton  dioicum,  Cavanilles;  Euphorbiacese ;  in 
the  Mexican  valley,  Acatzingo,  etc.  The  seeds  resemble  ricinus 
seeds,  are  flattened  on  one  side,  convex  on  the  other,  3  or  4  Mm.  long, 
smooth,  glossy,  black  mottled  with  gray,  carunculate,  the  episperm 
hard  and  brittle,  the  endopleura  very  thin,  but  distinct.  Morales 
(Thesis,  1872)  found  in  the  seeds  29  per  cent,  of  fixed  oil,  albumen, 
gum,  resin,  etc.  The  emulsion  of  the  seeds  is  drastic,  and,  accord- 
ing to  Dr.  Mucio  May  cote,  the  fixed  oil  may  be  advantageously  used 
in  place  of  croton  oil.    The  root  is  likewise  drastic  in  doses  of  2  gm. 
Yesgos  del  pais,  Urtica  mexicana,  Fl.  Mex.  ined.;  in  temperate 
districts.  The  root  is  used  as  a  diaphoretic  and  as  a  substitute  for 
Sambucus  Ebulus,  Lin. 
Yolochiahitl,  Psoralea  gland ulosa.  Lin.;  Leguminosse;  in  hot  and 
damp  regions,  in  Chile,  etc.  The  infusion  of  the  leaves  is  vermifuge, 
and  used  externally  as  a  vulnerary;  the  root  is  emetic. 
Yoloxochitl  or  laurel  tulipan,  Magnolia  mexicana,  Mociflo  et  Sesse; 
in  Morelos  and  other  states.  The  flowers  which  appear  in  March, 
contain,  according  to  Mendoza  and  Herrera,  volatile  oil,  resin,  quer- 
citrin,  tannin,  etc.  The  infusion  of  the  fresh  flowers  is  antispasmodic, 
and  the  tincture  of  the  fresh  flowers  is  used  as  a  tonic. 
Yoyote  or  narciso  amarillo,  Thevetia  Iccotli,  De  Cand.;  Apocy- 
nacese  ;  in  the  hot  and  damp  regious  of  the  western  slope.  According 
to  Herrera,  the  seeds  contain  non-drying  oil,  protein  compounds,  ex- 
tractive and  the  toxic  principle  tevetosin  (see  paper  by  Prof.  Herrera 
in  Amer.  Jour.  Phar.  1877,  p.  145).  The  poisonous  properties  of 
yoyote  are  generally  known,  but  the  drug  has  not  yet  been  employed 
