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For the first time, the composition and content of phenolic compounds (PC) of plant leaves of an endemic rare species of the  Xiphidium  Bunge section of the genus  Astragalus  L. of Siberia –  Astragalus palibinii  Polozhij was studied by HPLC. 11 compounds of phenolic nature were identified in water-ethanol extracts of  A. palibinii  leaves: gallic, p-hydroxybenzoic, chlorogenic, caffeic, ferulic, trans-ferulic, cinnamic acids, isoquercitrin, rutin, isoramnetin-3-O-rutinoside and L-epicatechin. The composition of PC in the leaves of plants of three cenopopulations  A. palibinii  from Khakassia is the same, with the exception of one hydroxycinnamic acid in trace amounts. The content (mg per 100 g DW) of flavonol glycosides in the leaves of  A. palibinii  plants varies in the range of 0.442–0.907, the content of hydroxycinnamic and hydroxybenzoic acids in the range of 98.5–109.7 and 32.5–83.9, respectively. The quantitative profiles of all the studied groups of PC are characterized by significant variability in the content of individual components. The variability of the content of hydroxycinnamic acids, flavonoids and hydroxybenzoic acids was determined as very low, medium and increased, respectively.

Phenolic profiles of the endemic species Astragalus palibinii Polozhij