A new species of (Malvaceae) from Vietnam.

A new species of from Vietnam - - is described, illustrated, and compared with the similar . differs from by the length of the petiole (7.0-9.

, a new species of Aristolochiaceae from northern Vietnam and two new combinations in .

Luu, Q.B.Nguyen & H.

Essential Oils from Vietnamese Asteraceae for Environmentally Friendly Control of Mosquitoes.

Mosquitoes, in addition to being a biting nuisance, are vectors of several pathogenic viruses and parasites. As a continuation of our work identifying abundant and/or invasive plant species in Vietnam for use as ecologically friendly pesticidal agents, we obtained the essential oils of , , , , and ; analyzed the essential oils using gas chromatographic techniques; and screened the essential oils for mosquito larvicidal activity against and . The most active larvicidal essential oils were , which was rich in thymohydroquinone dimethyl ether (29.