46 BILLETIN 1201, U. S. DEPARTMENT OF AGRICULTURE. 
Pieris ovalifolia (Wall.) D. Don. Ericaceae. Synonym: Andromeda ovali- 
folia Wall. 
Greshoff (31. p. 96), quoting Watt, says that this is a useful in- 
secticide. 
Pilocarpus jaborandi Holmes. Rutaceae. Jaborandi. Northern Brazil. 
Cook and Hutchison (18, p. 4) found that the powdered leaves had 
a slight effect on fly larvae. 
Pimenta officinalis Lindl. Myetaceae. Synonyms: P. pimenta Karst, P. vul- 
garis Lindl. Allspice. West Indies and tropical America, cultivated every- 
where in tropical countries. 
Scott, Abbott, and Dudley (83, p. 5, 13, 26, Sit) found powdered 
allspice ineffective against bedbugs, roaches, clothes moths, and car- 
pet beetles, and Abbott (1, p. 11) found it of no value against the 
dog flea. 
Pimpinella anisum L. % Apiaceae. Anise. Southern Europe to the Levant; 
also cultivated. 
Scott, Abbott, and Dudley (83, p. 13) found powdered anise seed 
ineffective against roaches. 
Piper nigrum L. Piperaceae. Black pepper. India, cultivated in many 
tropical countries. 
Graham-Smith (30, p. 250), quoting Howard, of Australia, says: 
" Flies may be effectively destroyed by putting half a spoonful of 
black pepper in powder on a teaspoonful of brown sugar and one 
teaspoonful of cream. Mix all together and place in a room where 
flies are troublesome, and it is said they will soon disappear." 
Quaintance and Brues (69, p. 133), quoting tests made by Bishopp 
and Jones, say that black pepper had no effect on the oviposition 
of the bollworm when this substance was placed on the silk and ears 
of corn. 
Kiley (71, p. 187) states that a strong extract killed cotton caterpil- 
lars tested by contact within 12 hours. 
Podophyllum peltatum L. Berbertdaceae. Common mayapple. Ea stern 
United States. 
Riley (71, p. 187) says that the powder from the dried roots did 
not affect cotton caterpillars when dusted upon them. 
Pogogyne parviilora Benth. Menthaceae. California. 
Chesnut (15, p. 384) says: "Many of the Indians place the culled 
plants in or about their houses to drive away fleas." 
Polygonum hydropiper L. Polygonaceae. Synonym : Persicaria hiiriropipcr 
Opiz. Water-pepper. Europe, United States. 
Porcher (68, p. //Of)) quoting from Floria Scotica, states that it is 
found a convenient and useful application for driving off flies from 
wounds occurring on cattle. 
Riley (71, />. 18S) says that a decoction of the leaves and an alco- 
holic extract had no effect on cotton caterpillars. 
