volatile components of butterfly nectar plants, lantana camara l., vitex trifolia l. and hibiscus rosa-sinensis l. and host plants, cleome spinosa l., dregea volubilis (linn.f.) benth.ex hook.f. and parsonsia laevigata (moon) alston, were analyzed by automatic thermal desorption-gas chromatography-mass spectrometry process (atd-gc-ms).of the three nectar plants, the most dominant components were terpenes, which total content exceeded 60 %, together with eucalyptol with higher content.also there were some hydrocarbons, alcohols and aromatic compounds detected in the three nectar plants.host plant volatiles presented a different composition.c. spinosa volatiles were mainly composed of terpenoids (36.35 %), aldehydes (29.07 %), ethers (10.48 %) and acids (9.15 %).d. volubilis volatile compounds were mainly esters (21.03 %), next were terpenoids (19.53 %).p. laevigata volatiles were composed mainly of aldehydes (32.2 %) and esters (19.41 %).