602     Materia  Medica  of  the  Mexican  Pharmacopceia.    {^"^  Derirgs**^"" ' 
Gordolobo  del  pais,  Gnaphalium  canescens,  De  Cand.;  Compositse; 
in  temperate  regions  of  Mexico.  The  flowers  of  this  species,  as  well 
as  of  Gn.  Berlandieri,  De  Cand.;  Gn.  hirtum,  Humb,,  and  Gn.  visco- 
sum,  Humb.,  which  are  abundant  near  the  capital,  are  used  as  a  sub- 
stitute for  mullein  as  an  emollient  and  pectoral. 
Guaco,  Aristolochia  fragrantissima,  Ruiz  et  Pavon;  Aristolochiacese ; 
in  Colima,  etc.  The  branches,  which  are  stimulant  and  antispas- 
modic, are  woody  and  twining ;  the  bark  is  gray,  thick  and  fissured ; 
the  cork  rolled  up;  the  wood  whitish  and  with  large  ducts;  the  odor 
aromatic,  resembling  that  of  French  marigold  (Tagetes),  and  the  taste 
bitter  and  aromatic.  The  drug  contains  a  volatile  oil,  tannin,  resin^ 
bitter  principle,  gum,  starch  and  salts.  It  enjoys  considerable  reputa- 
tion as  an  antidote  to  poisoning  by  scorpions,  vipers  and  other  animals, 
and  is  used  externally  in  purulent  ophthalmia,  blennorrhagia,  chronic- 
ulcers,  vaginitis,  etc.  The  powder  is  given  in  doses  of  1  to  5  Gm., 
and  an  infusion  is  made  containing  20  Gm.  to  the  liter.  Arist.  gran- 
diflora,  Swartz,  has  analogous  properties,  and  in  Yucatan  the  guaco  de 
San  Cristobal,  Ar.  pentandra,  Lin.,  is  similarly  employed. 
In  a  similar  manner  are  also  employed  the  stems  and  leaves  of  dif- 
ferent species  of  Mikania  (Compositse),  namely,  M.  Guaco,  Kunth^. 
guaco  de  Tabasco  or  de  Guatemala;  M.  Houstonis,  guaco  de  Vera- 
cruz ;  and  M.  Gonvelada,  guaco  de  Tampico. 
Guarana,  from  the  seeds  of  Paullinia  sorbilis,  Martins.  The  seeds 
of  the  Mexican  species  P.  barbadensis,  Jacquin;  P.  costata,  Schlech- 
tendal,  and  P.  pinnata,  Lin.,  may  perhaps  be  made  to  yield  a  similar 
preparation. 
Gnayabo,  Psidium  poraiferum,  L.,  and  Ps.  pyriferum,  L.;  Myrta- 
cese;  in  hot  and  moist  districts.  The  bark  contains  tannin  12  1,  sugar 
and  other  matters  soluble  in  water  13*8,  resin  and  chlorophyll  l'7y 
calcium  oxalate  30*8  per  cent.,  etc.  The  root  and  bark  are  used  as- 
astringents  in  diarrhoea;  the  leaves  as  av^ulnerary  and  resolvent,  and 
the  fruit  as  an  anthelmintic  and  aliment. 
Habilla  de  San  Ignacio,  the  seed  of  Hura  crepitans,  Lin.;  Euphor- 
biacese ;  in  hot  and  moist  districts.  The  seeds  contain  50  per  cent,  of 
fixed  oil,  and  are  used  as  a  drastic  in  doses  of  0*05  to  0*10  Gm.  They 
should  not  be  confounded  with  Haba  de  San  Ignacio  or  Cabal onga^ 
the  seeds  of  Strychnos  Ignatii. 
Hanchinol,  Heimia  syphilitica,  De  Cand.,  and  H.  salicifolia,  Link; 
Lythracese ;  in  the  State  of  Mexico.    The  leaves  contain,  according  to» 
