Key Word Index-.-Soklnum .wnthwcwpum: Solanaceae; qucrcetin 3-0-fl-o-glucosyl-0-P-o-mannoside; apigenin: sitosterol Although Solanum xanthocur~ is oi some medicinal value there has been no previous chemical examination of the flowers. in the present work, apigenin Cl] was identified in the petals and a new flavonol diglycoside and sitosterol were isolated from the stamens. The Identity of apigcnin and sitosterol was confirmed by standard procedures. The new flavonol glycoside, C,,F,,O, , mp 184q gave the characteristic colour reacttons o f a flavonol [2,3] and on hydrolysis with lo”,, ethanohc H$O, gave quercetin and a disaccharide, the component sugars of which were glucose and mannose. Glucose was confirmed by co-chromatography and by the preparation of its phcnyiosazone. mp 204‘: (lit. 205”); mannose was conlirmed by mp 131”, [a]? + 13.9” {water), co-chromatography and by the preparation of its pheny~hydrazone, mp 196” (lit. 199. 200”) and N-glycosyl aminobenzoic acid, mp 179” (lit. lgl“). Periodate oxidation indicated that both sugars in the disaccharide had the pyranose configuration; 3.4 mol of periodate were consumed with the liberation of 1.3 mol of formic acid. On methylation of the glycoside 141 followed by hydrolysis, two methylated sugars were identified in the hydrolysate, viz. 2,3,6tri-O-methyl-D-mannose and 2,3,4,6-tetra-O-methyl-rlglucose, indicating that C, of the mannose is linked with the C,-OH of the aglycone and that C, of the mannose is attached to C, of the glucose. Only glucose could be identified in the aqueous hydrolysate obtained after acid hydrolysis, indicating that glucose occupies the terminal position. The position of the disaccharide molecule at position - 3 was confirmed by the ready H,O, oxidation of the glycoside in dilute NH,OH and was further confirmed by acid hydrolysis of the methylated glycoside. The methylated aglycone hydrolysate, mp 192.-93”. was identified as 5,7,3’,~-tetra-0-methylquercetin by ~~~-~hromalog~phy with an authentic compound obtained similarly from quercetin-3-glycoside. Since the glycoside failed to reduce Fehling’s solution and also did not give a test with aniline hydrogen phthalate, the glucose molecule must be linked to mannose through its reducing group. Hydrolysis of the glycoside with emulsin gave glucose and mannose, indicating a p-linkage between the two sugar units in the disaccharide as well as between the aglycone and mannose. Thus, the original glycoside is quercetin-3-O-,%glucopyranosyl-0-/j-D-mannopyranoside.