One new eudesmane derivative [2-alpha-hydroxyeudesma-4,11(13)-dien-12,
8 beta-olide-2-O- beta-D-xylopyranoside] was isolated from the aerial
parts of Pluchea dioscoridis. Its structure was deduced from spectrosc
opic studies. Other known compounds pluchecin, stigmasterol, beta-sito
sterol and sitosterol glucoside, were also identified,