volatile 8.59% , 8.46% , 6.35% and 5.43% respectively)

volatile oil
was obtained by hydrodistillation method  from  the
coarse dried plant of  R. epapposum. that  collected from Qassim region

 The volatile oil
contained 47 compounds in which the major components were identified by Gas chromatography mass spectroscopy analysis as Modephene , Caryophyllene , Linalyl acetate , Tau-Cadinol acetate and Epizonarene and the percentage was (10.51%
,
8.59% , 8.46% , 6.35%
and 5.43% respectively) as shows in table 2 and shows in RT (retention time) (16.216, 16.752, 12.031 , 19.383 , 19.437 respectively)

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To
our knowledge there are 3 study that obtained
and identified the composition
of the volatile oil of R. epapposum

First  study that done in King  Saud University  reported 
a total 45 compounds of essential oil 
of from the aerial parts of R. epapposum that collected from the
region of Majmaah North of Riyadh, Saudi Arabia were the major compounds
identified as camphene, myrcene, limonene, a-pinene, sabinene and b-pinene which
no one of this compound was identified in our study except for limonene with
only (1.64%)
  

 

Also another
study that done in iran reported linalool , a-phellandrene ,

b-phellandrene
and bulnesol as the major  compounds of essential
oil from the aerial parts of R. epapposum and we identified linalool in our
study with ( 3.80%)

 

last literature
preformed in Northern Border University, Arar, Saudi Arabia were the plant collected
from Dawmat- Algandal region, located at the northern border region of Saudi
Arabia the studt report total 47 constituents of volatile oil were (limonene , sabinene,
linalool, a-pinene, 4-terpineol, b-myrcene, and a-cadinol) represent

( 32.75% , 13.13%
, 10.10% ,  8.45% ,  7.46% , 7.13% 
, 5.02% respectively)

Of total Percentage
of the volatile oil from the flowers
and leaves and we identify 3 of the constituents in our study (limonene, linalool
, terpineol) with different Percentage

 

when compering
between our studt and the 3 literature there is a qualitative and quantitative differences
in the composition of the volatile oiland that may be due to differences in the
location of collected plant and  weather or in time were the plant was collected