AF4bma!-y,Pih9ai™'}       Plants  Used  as  Insecticides.  93 
In  the  south  the  leaves  are  used  as  fly  poison.  (Pammel.) 
The  leaves  and  fruit  pulp  have  been  used,  when  rubbed  up  with 
milk,  to  poison  flies.  (Chesnut,  U.  S.  Dept.  Agr.  Div.  Bot.  Bull.  20, 
1898,  p.  28.) 
Haplophyton  cimicidum  A.  DC.  Apocynacece. 
Arizona  to  Guatemala  and  Cuba. 
Listed  as  an  insecticide  by  Greshoff . 
Hedeoma  pulegioides  (L.)  Pers.    Labiatce.    Synonyms:  Mellisa 
pulegioides  L.   1753,  Cunila  pulegioides  L.   1762,  Ziziphora 
pulegioides  Desf.   Pennyroyal.   Eastern  U.  S. 
No  result  upon  cotton  worms  (Aletia)  was  observed  from  the 
applicatioin  of  the  alcoholic  extract,  decoction  or  infusion.  (Riley.) 
Source  of  the' official  oil  of  Pennyroyal;  also  used  to  drive  away 
mosquitoes.  (Lyons.) 
Helenium  autumnale  L.  Composite?. 
Helenium  tenuifolium  Nutt.    Sneeze-weed.   Eastern  U.  S. 
This  plant  rendered  the  cotton  plant  obnoxious  to  worms 
(Aletia)  so  that  they  would  not  feed  upon  it,  but  did  not  kill  them. 
The  decoction,  infusion  and  alcoholic  extract  were  without  effect, 
as  were  likewise  the  dried  flower  heads.  (Riley.) 
Riley  also  states :  "  The  universal  belief  that  these  two  species 
of  dog-fennel  are  never  attacked  by  any  insect  is  without  foundation. 
We  found  a  small  Longicorn  borer  (larva  of  Mecas  inornata)  bor- 
ing in  the  stem;  an  unnamed  species  of  Paris  bores  in  the  root,  while 
the  flower-heads  are  badly  infested  by  several  species  of  Prachy- 
tarsus." 
Heliotropium  indicum  L.    BorraginacecE.    Indian  Heliotrope. 
The  decoction  produced  no  effect  upon  cotton  worms  (Aletia). 
(Riley.) 
Helleborus  antiquorum  A.  Braun,  Eranthis  hyemalis  (L.) 
Salisb.,  Helleborus  niger  L.,  Helleborus  orientalis,  Helle- 
borus viridis  L.  Ranuncidaceoe. 
Hicoria  glabra  (Mill.)  Brit.  Juglandacece.  Synonyms:  Juglans 
glabra  Mill.,  Carya  porcina  Nutt.,  Hicoria  porcina  Raf.  Pig- 
nut, Pig-nut  Hickory.   Eastern  U.  S. 
An  infusion  of  the  leaves  in  water  and  washing  a  horse  with 
