Specimens from Iraq in the early 20th century may have the number prefixed by 'Rustam'. This refers to collections for the 'Herbarium of the Rustam Experimental Farm, Department of Agriculture, Iraq'.  The collections were made by E.R.Guest or other collectors whose names appear in italics on the labels.

The Rustam Herbarium, 'Iraq.: Part 1. Systematic List, R. A. Blakelock