PLANTS INSECTICIDAL PROPERTIES. 41 



Kalmia angustif olia L. Ericaceae. Sheep laurel. Lambkill. Eastern North 

 America. 



Cook and Hutchison (18, p. 4) found that the dried leaves had no 

 effect on fly larvae. 



The writers' results are given on page 22. 



Karwinskia humboldtiana Zucc. Rhamnaceae. Margarita. Mexico. 

 The writers' results are given on page 22. 



Lavandula spica L. Menthaceae. Synonym : L. angustif olia Mill. Laven- 

 der. Mediterranean region. 



Scott, Abbott, and Dudley (83, p. 28) determined that lavender 

 flowers were ineffective while the oil of lavender was effective in 

 protecting flannel from clothes-moth infestation. 



Ledum palustre L. Ericaceae. Crystal-tea. Northern Europe. 



It is reported from Austria (4) that this plant kills lice, bedbugs, 

 fleas, moths, and other insects. It is most active when green and in 

 blossom, but the dried material is also effective. 



Lyons (S3, p. 266) reports that the leaves and twigs of L. palustre 

 L. are used as an insecticide. 



Ledum groenlandicum Oeder. Synonym : L. latifolium Ait. True Labrador- 

 tea. Northern North America. 



Williams (44y V- ®16) savs that it is reported to kill lice, insects, 

 etc. 



Leontodon tuberosus L. Asteraceae. Synonym : Thrincia tuberosa DC. Old 

 World. 



Passerini (66) states that the opened flowers and roots were in- 

 active against flies and the dog flea. 



Linaria vulgaris Hill. Scroph cxariaceae. Synonyms : L. linaria Karst, An- 

 tirrhinum linaria L. Common toadflax. Europe, naturalized in the United 

 States. 



Williams (9^, p. 917) says: "The expressed juice mixed in milk 

 is a poison to flies, and the smell of the flower also kills them." 



Lonchocarpus sp. Fabaceae. Lancepod. 



The writers' results are given on page 23. 



Lycium halimifolium Mill. Solanaceae. Common matrimony-vine. Eu- 

 rope, escaped from cultivation in the United States. 



The writers' results are given on page 23. 



Lycoperdon bovista L. Lycoperdaceae. Synonyms : L. giganteum Batsch., 

 L. caeiatum Fries, Bovista giganteum Nees. Giant puffball. 



Greshoff (31, p. 167) says that it is " Used in its mature condition 

 as a styptic and for stupefying bees." 



Gomilevsky (28) reports that the spores may be used in the same 

 way as flowers of sulphur. The insects covered with this powder 

 either perish from its mechanical effects or are poisoned by it. 



