What is "crossostephium"

Crossostephium is a genus of flowering plants in the daisy family.

1. Crossostephium artemisioides Less. - China, India, Vietnam, Philippines
2. Crossostephium chinense (A.Gray ex L.) Makino - Japan, Kazan-retto, Nansei-shoto, Taiwan, Guangdong, Indochina, Peninsular Malaysia, Philippines