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. angustifolia 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 (1^, p. 916) says 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. Scrophulariaceae. 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. caelatum 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. 
