Am  jour.  Pharm.  |       Plants  Used  as  Insecticides.  101 
February,  19 19.  J  1KJX 
Picrasma  quassioides  Benn.    Synonym :  Nima  quassioides  Ham. 
Northern  India. 
Possesses  insecticidal  properties.  (Lyons.) 
Pieris  ovalifolia  D.  Don.    Ericacece.     Synonym :  Andromeda 
ovalifolia  Wall. 
A  useful  insecticide.    (Watts,  quoted  by  Greshoff.) 
Pinus  palustris  Mill.  Pinacece.  Synonym :  Pinus  australis  Michx 
Long-leaved  Pine.  Virginia  to  Florida  and  Texas. 
Resinous  exudate  is  turpentine,  of  which  Wilson  (quoted  by 
Porcher)  says :  "  Turpentine  is  one  of  the  best  means  of  chasing 
away  fleas  whether  from  place  or  animal,  and  a  bed  of  very  fine 
shavings  of  some  wood  which  abounds  in  turpentine  is  one  of  the 
easiest  and  most  effectual  means  of  banishing  them  from  dogs." 
Podophyllum    peltatum    L.     Berberidacece.    Mandrake,  May 
Apple.   Eastern  U.S.  - 
No  result  upon  cotton  worms  (Aletia)  was  observed  upon  the 
application  of  the  powdered  dried  root  of  this  plant,  nor  upon  the 
application  of  the  powder  stirred  up  in  water.  (Riley.) 
Pogogyne  parviflora  Benth.  Labiatce. 
"  Many  of  the  Indians  place  the  culled  plants  in  or  about  their 
houses  to  drive  away  flies."  (Chesnut,  U.  S.  Dept.  Agr.  Div.  Bot. 
Contributions  from  the  U.  S.  Nat.  Herbarium,  Vol.  VII,  No.  3,  1902, 
p.  3340 
Prunus  spinosa  L.    Sloe ;  Blackthorn.  Europe. 
Hardly  at  all  liable  to  be  attacked  by  insects,    (von  Mueller.) 
Pteridium    aotjilinum    (L.)    Kuhn.    Polypodiacecs.  Common 
Brake. 
In  Austria  the  leaves  are  placed  in  the  bed  as  a  protection  against 
vermin.  (Pharmaceutische  Zeitung,  Vol.  37,  No.  103,  December 
24,  1892,  p.  798.) 
Pulicaria  dysenterica  (L.)  Gaertn.    Composite.    Synonym:  In- 
ula dysenterica  L.    Fleawort.    Southern  Europe. 
Herb  insecticide.  (Lyons.) 
Pyrethrum  calamita.  Composite. 
Heads  of  this  exert  an  effect  on  insects  similar  to  that  of  Per- 
sian insect  powder.  (Gieseler,  Proc.  Am.  Pharm.  Assoc.,  Vol.  10, 
1862,  p.  162.) 
