How do you spell Barilla

Available Definitions:
1)  n. - A name given to several species of Salsola from which soda is made, by burning the barilla in heaps and lixiviating the ashes.
2)  n. - The alkali produced from the plant, being an impure carbonate of soda, used for making soap, glass, etc., and for bleaching purposes.
3)  n. - Impure soda obtained from the ashes of any seashore plant, or kelp.