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Drought stress is one of the most important stresses adversely affecting plant growth and yield production. Due to the importance of global warming, the investigation of drought effects on the growth and quality of medical plants is of vital importance. Accordingly, a two-year field experiment was conducted in 2013–2014 to determine the effects of drought levels and plant species on Balangu (Lallemantia sp.) growth and physiological properties including medicinal content. The experiment was a split plot in which the drought levels (main plots) including control (D1, moisture field capacity, water potential at, 0.5 atm), moderate stress (D2, 6.5 atm) and severe stress (D3, 9.5 atm), and the Balangu species (sub plots) including Lallemantia royleana (Benth) (L1) and L. iberica (L2) were tested as the experimental treatments. Plant yield, oil content and the biochemical properties (i.e. medicinal content) including …