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 M E N T H A   arvensis.  
 Corn  Mint. 
 DIDYNAMIA  Gymnospermia. 
 Gen. Char.  Cal.  5-cleft.  Cor.  nearly  regular,  4-cleft;  
 its  broadest segment notched.  Stamina  erect,  distant. 
 Spec.  Char.  Flowers whorled.  Leaves  ovate.  Stem  
 much  branched.  Calyx  bell-shaped,  clothed  all  
 over with  horizontal  hairs. 
 Syn,  Mentha arvensis.  Linn.  Sp.  PI.  806.  Sm.  Tr.  
 o f L.  Soc.  v.  5.  213.  FI. Brit.  623.  Huds.253. 
 With. 524.  H u lle d . 2.  113.  Relh. 228.  Sihth.  
 182.  Abbot.  127-  Sole Menth.  29.  t.  12. 
 M.  seu  calamintha  aquatica.  Rail Syn.  232. 
 .FREOUENT  in  corn-fields  where water  stagnates  in  winter,  
 especially  on  a  sandy  or gravelly .soil,  flowering from  July  to  
 September. 
 Root  perennial,  creeping  by means  of  turgid  fleshy  shoots,  
 very  difficult  to  eradicate.  Stem mostly  diffuse.  Leaves ovate  
 inclining  to  elliptical,  obtuse,  clothed  with  rather  rigid  prominent  
 hairs.  Flower-stalks  generally  smooth,  sometimes  
 furnished  with  a  few  spreading  or  slightly  deflexed  hairs.  
 Calyx  shorter and more  bell-shaped  than  in  the  other  British  
 species,  and  essentially  characterized  by  being  clothed  all  
 over with horizontally-spreading  hairs.  Flowers  reddish-lilac.  
 The scent of  this  species  is justly  compared  to  the  flavour of  
 cheese  covered with  blue  mould,  by which  all  the  varieties  
 mentioned  in  FI.  Brit,  are  also  distinguished.  Of  these  
 Mr.  Sole’s  M. prcecox has more smooth  and  neatly  elliptical  
 leaves  than  the  rest,  but we  cannot  find  sufficient  reasons  to  
 make  it  a  distinct  species.  Of his  agrestis  we shall  speak  in  
 the next page.  m.