126      Materia  Mediea  of  the  Mexican  Pharmacopoeia.  {A^l™h]m6*m° 
Tlacaxochitl,  Hedyotis  americana,  Cervantes;  Rubiaceae;  near  the 
city  of  Mexico.    The  root  is  astringent. 
Tlalpopolotl,  Flourencia  thurifera,  De  Cand.;  Composite;  in  hot 
regions.  The  root  is  pectoral  and  vulnerary,  and  the  resin  is  used  as 
a  substitute  for  frankincense. 
Tlanepaquelite  or  Yerba  santa,  Piper  sanctum,  Mocino  et  Sesse;  in 
Orizaba,  Oaxaca  and  other  states.  The  leaves  are  stimulant  and  are 
used  as  a  condiment.  By  distillation  the  plant  yields  a  volatile  oil, 
heavier  than  water  and  resembling  oil  of  sassafras. 
Tlatlancuaya  or  Yerba  del  tabardillo,  Achyranthes  calea,  Ibanes; 
Amaranthacese ;  Isucar  de  Matamoros  and  Atlixco.  Stem  subsuiFru- 
ticose,  thick,  striate  when  young,  afterward  rugose  and  knotty,  green, 
somewhat  bluish  and  spotted,  with  a  light  reddish  tint  between  the 
nodes;  leaves  ovate-lanceolate,  entire,  not  hairy,  8  to  12  or  sometimes 
22  Cm.  long,  and  4  to  6  or  9  Cm.  broad ;  flowers  very  small,  herma- 
phrodite and  arranged  in  lanuginous  glomerules;  fruit  an  akene 
crowned  by  the  style,  the  pericarp  thin,  membranous  and  in  the  upper 
half  with  red  dots.  Ibaiiez  found  in  the  plant  fat,  coloring  matters, 
extractive,  albuminoids,  sugar  and  oxalates,  nitrates,  chlorides  and 
phosphates.  The  plant  is  popularly  esteemed  as  an  excellent  febri- 
fuge ;  the  concentrated  decoction  is  used  principally  in  typhus. 
Tomate,  Physalis  pubescens,  Lin.,  Ph.  peruviana,  Lin.,  and  other 
species  of  Physalis  (Solanacese)  are  indigenous  and  cultivated  in  Mexico, 
the  fruit  being  used  as  a  condiment  and  externally  as  an  emollient. 
Tomatillo,  Physalis  angulata,  De  Cand.;  in  Tabasco,  Yucatan  and 
other  states.    The  entire  plant  is  antiperiodic. 
Tomillo,  Thymus  vulgaris,  Lin.,  is  cultivated  in  Mexico,  but  in  its 
place  the  "tomillo  de  Jalapa,"  Micromeria  jalapensis,  De  Cand.,  which 
has  identical  properties,  is  often  used. 
Toronjil,  Cedronella  mexicana,  Bentham;  Labiatse;  in  Xochimilco, 
&c.  The  flowering  tops  are  used  as  a  substitute  for  melissa ;  they  con- 
tain an  abundance  of  volatile  oil  which  is  also  employed.  The  same 
name  is  also  applied  to  Cedronella  pallida,  Lindley,  and  Calamintha 
Nepeta,  Link,  of  which  the  former  is  more  frequently  collected  and 
has  an  odor  resembling  that  of  pennyroyal. 
Trementina  comun,  obtained  from  incisions  made  into  the  trunk  of 
the  "ocote,"  Pinus  Teocote,  Schlechtendal,  which  grows  in  the  moun- 
tains near  the  Mexican  valley  and  in  many  other  places.  The  turpen- 
tine has  the  consistence  of  a  thick  syrup,  and  ordinarily  a  dingy  white 
