The chamomile or Matricaria Chamonail is a plant of chicory and Radiae subsidiary group.
The stem of the chamomile is cone shaped and more or less planar.
Weight of 1000 seeds of the chamomile is 2% to 3% of gram [4,5].
The chamomile has varieties of diploid 2n=18 and tetraploid 2n=36.
The chamomile is from temperate regions and has average thermal needs.
The chamomile is not sensitive to winter temperature during stage of Corn; but it can be damaged by spring temperature during the stage of stem thickening and cease its growth and decrease the formation of the flower.
The results of the researches show that there is positive correlation between illumination period and amount of the essence in the chamomile.
Though the chamomile is a winter resistant plant, but cold effects are not necessary for efflorescence.
The chamomile is the most precocious kind regarding flowering in salty soils.
The chamomile is saltiness resisting, but cannot be supposed as a Halophyt plant; because it grows well in default of sodium salts.