Abstract: The chemical constituents of Zanthoxylum myriacanthum  var. pubescens collected at Mengwang,Jinghong,Yunnan,China were isolated by column chromatography on silica gel,MCI and Sephadex LH-20 and identified by chemical and spectral analyses.Seventeen compounds were finally isolated and purified from barks of Z.myriacanthum var. pubescens. Their structures were elucidated as 1-bromo-7-methyl-(7S)-nonadecane (1),1-O-β-D-glucopyranosyl-(2S,3R,4E,8E)-2-［(2-hydroxyhexadecanoyl) amido］-4,8-octadecadiene-1,3-diol (2),machilusmarin (3),dibutylphthalate (4),salicylic acid (5),phydroxybenic acid (6),adenosine (7),alhagidin (8),quercetin-3-O-α-L-arabinopyranoside (9),hesperidin (hesperetin-7-O-rutinoside) (10),rhoifoline B (11),zanthoxyline dimethoxy derivative (12),Nnitidine (13),nitidine (14),sitosterol (15),stigmasterol (16),daucosterol (17).Compounds 1-14 were obtained from this plant for the first time.Compounds 1,3,8,10,12 were obtained from this genus for the first time.

Key words: Zanthoxylum myriacanthum var.pubescens, barks, chemical constituents, alkaloid