S. volkensii Aschers. & Schweinf., Ill. Fl. Egypte 130. 1887; Greuter, Med-Checklist ed.2, 1: 312. 1984; S. autrani Post, Fl. Syria 690.1896.

Much like and very closely related to S. nitraria, but differing in the following characters: branches and leaves with denser indumentum; bracts and bracteoles with persistent hairs; tepal back pilose with stiff ascending hairs - in fruit thickened along a dorsal line, with distinctly incurved margins beak-like bent together and forming a 5-arched open or closed dome.

Lectotype: [Turkmenistan] Ad littora caspica prope Krasnowodsk, 1825, K.E. von Eichwald (LE!) Freitag, l.c. 1997.

The species has not been collected in Pakistan, but as it occurs scattered through Afghanistan up to neighbouring Kalat prov., there is a good chance that it grows also in upper Baluchistan and in Waziristan; Distribution: Northern Caspian lowland, Anatolia and lower Egypt east to W. China, south to Yemen and Saudi Arabia, Iran, Afghanistan.

Because of rather many transitional forms, specific rank for S. incanescens is debatable (already Boiss., p. 954, listed S. incanescens in the synonymy of S. nitraria). Both taxa agree also ecologically and they are widely sympatric.