Thymus hirtus

OH-4 -OMe 8-C-/ -OH-benzyl / -Hydroxybenzyl-diosmetin Thymus hirtus Lam. Aerial parts 80 3... 

C-Linked aromatic substituents are reported to occur in aerial parts of Thymus hirtus along with one report on Chinese propolis.In aerial parts of some members of Asteraceae and Lamiaceae, flavones with a C-6-ketopyrano-substitution were reported (e.g., hosloppin, oppositin see Figure 12.4). These aromatic substituents are positioned at the 6-, and rarely, at the 8-position of ring A. They are all reported from aerial parts, but no reference is made to their possible occurrence as exudates constituents. 

As with the corresponding flavones, aerial parts of Thymus hirtus (Lamiaceae) afforded p-OH-benzyl derivatives of kaempferol and quercetin, respectively. Earlier, Haplopappm foUosus (Asteraceae) was reported to accumulate haplopappin, a phenylethyl substituted quercetin derivative. Similar substituted flavones have also been found mainly to occur in members of Lamiaceae and Asteraceae (see Table 12.3), thus being probably chemosyste-matically significant accumulation trends. 

Merghem, R. et al., Five 8-C-benzylated flavonoids from Thymus hirtus (Labiateae), Phytochemistry, 38, 637, 1995. 

This species is related to Thymus hirtus W. and Thymus vulgaris L., and has been placed by Boissier under Thymus mastichina L., and by Pourret under Thymus sparsifolius, var. hyemalis, but by J. Lange it is considered to be a distinct species. Its heath-like habit of growth is, at all events, very distinctive, as well as the small heads of flowers, each of which is nearly stalkless. 

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