no, tripterygium wilfordii and marigold are not the same plant.

Leigonggen

Scientific name: Centella asiatica

Family and genus: Chimonanthaceae

Alias: Scoparia japonica, Leigongcao, Tripterygium wilfordii, Centella asiatica, Laogonggen, Ditangcao, Polygonum cuspidatum, Scoparia, Erigeron breviscapus, Crassus gigantea, and Centipede.

picture:

http://www.opac.hornsby.nsw.gov.au/herbarium/images/images/centenella-asiatica.jpg

Calendula officinalis

family: Compositae.

alias: calendula.

picture:

http://online-media.uni-marburg.de/biologist/botex/mallorca5/bildgross/calendar _ official.jpg.