10.22376/ijpbs.2019.10.1.p1-12 Volume 2 Issue 3 2011 (July - September) The Genus lessThan i greaterThan Shorea lessThan /i greaterThan Roxb. ex Gaertn. (Dipterocarpaceae) is rich in species diversity with 194 species. In South Asia, the species of lessThan i greaterThan Shorea lessThan /i greaterThan show great variation in morphological characters. These species are dominantly distributed in the forest habitats of the tropical and some parts of subtropical zones. Since more than two decades, the taxonomy of lessThan i greaterThan Shorea lessThan /i greaterThan has been a point of discussion. Time to time, various taxonomists have tried to classify the species of lessThan i greaterThan Shorea lessThan /i greaterThan on the basis of anatomical and morphological characters. This type of controvercy in the arrangement of the species can also be solved by the study of chemicals. Information regarding chemical constituents of the species of lessThan i greaterThan Shorea lessThan /i greaterThan is very limited. Among the chemical constituents present in different parts of the plants, flavonoids are already proved as potentially important markers for taxonomic studies due to its characteristics such as structure variability, chemical stability, ubiquitous occurrence and easy and rapid identification lessThan i greaterThan . lessThan /i greaterThan During the chemotaxonomic study of lessThan i greaterThan Shorea lessThan /i greaterThan of South Asia, flavonoid aglycones (flavonol quercetin, myricetin, kaempferol, and flavones luteolin, apigenin and proanthocyanidin) and four flavonoid glycosides (quercetin 3-glucoside, quercetin 3-rutinoside, kaempferol 3,5-glucoside, and luteolin 7- glucoside) were isolated from the leaves of lessThan i greaterThan Shorea lessThan /i greaterThan using standard procedures after separation and purification by paper chromatography in several solvent systems. The isolated flavonoids can be used as chemotaxonomic markers and also as active ingredients of many medicines. The ethnobotanical study of the species of lessThan i greaterThan Shorea lessThan /i greaterThan was also carried out. At present, the species of lessThan i greaterThan Shorea lessThan /i greaterThan and their parts are under serious threat due to habitat destruction and over-exploitation. An integrated approach is, therefore, essential for the sustainable management of lessThan i greaterThan Shorea lessThan /i greaterThan . Strategies for sustainable management of the species have also recommended. Kunjani Joshi flavonoids, quercetin, luteolin, proanthocyanidin, taxonomy, Dipterocarpaceae. 1-12