Related Experiment Video
Updated: Aug 9, 2026

Colletotrichum fioriniae Development in Water and Chloroform-based Blueberry and Cranberry Floral Extracts
Published on: April 12, 2019
A distinctive flavonoid chemistry for the anomalous genus Biebersteinia
J Greenham1, D D Vassiliades, J B Harborne
1Department of Botany, The University of Reading, Whiteknights, UK.
Abstract:
Leaf surface extracts of Biebersteinia orphanidis have yielded a complex mixture of five flavones with the unusual 5,7-dihydroxy-6,8-dimethoxy A ring substitution pattern. They are acerosin, hymenoxin, nevadensin, sudachitin and 5,7,4'-trihydroxy-6,8-dimethoxyflavone. Also present at the leaf surface are gardenin B, luteolin, apigenin, acacetin and the coumarin umbelliferone. The internal leaf flavonoids include the 7-glucosides of apigenin, luteolin and tricetin, together with the 7-rutinosides of apigenin and luteolin. This profile differs from those of B. heterostemon and B. odora. It appears that B. orphanidis is as highly distinctive in its flavonoid pattern as it is phytogeographically. The data also confirm the conclusion of other studies, including rbcL and atpB gene sequence analysis, that Biebersteinia is completely unrelated to the Geraniaceae, where it was once placed.
Related Concept Videos
Frost Circles for Different Conjugated Systems
Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene
Special Staining Techniques
Bacterial Phylum Bacteroidota
Anoxygenic Phototrophic Bacteria
Antifungal Agents

