title: Chrysin and other leaf exudate flavonoids in the genus Pelargonium.
abstract: In a chemotaxonomic survey of 57 Pelargonium species, leaf exudate flavonoids were detected in 35% of the sample, mostly in trace amounts. However, chrysin and a related C-methylflavanone were identified as major leaf surface constituents of P. crispum, and a mixture of quercetin and kaempferol mono-, and di- and trimethyl ethers of P. quercifolium. In two other species, P. fulgidum and P. exstipulatum, methylated flavones were the only lipophilic flavonoids present. This is the first report of leaf surface flavonoids from the genus Pelargonium.
authors.affiliation: Department of Botany, University of Reading, Whiteknights, U.K.
authors.forename: C A
authors.initials: CA
authors.lastname: Williams
authors.forename: J B
authors.initials: JB
authors.lastname: Harborne
authors.forename: M
authors.initials: M
authors.lastname: Newman
authors.forename: J
authors.initials: J
authors.lastname: Greenham
authors.forename: J
authors.initials: J
authors.lastname: Eagles
mesh_terms: D002851:Chromatography, High Pressure Liquid; D002855:Chromatography, Thin Layer; D005419:Flavonoids / Q000032:analysis* / Q000302:isolation & purification; D018515:Plant Leaves / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet
chemical_list: D005419:Flavonoids; C043561:chrysin