The Collaborative International Dictionary of English v.0.48:

Glasswort \Glass"wort`\, n. (Bot.)
   A seashore plant of the Spinach family (Salicornia
   herbacea), with succulent jointed stems; also, a prickly
   plant of the same family (Salsola Kali), both formerly
   burned for the sake of the ashes, which yield soda for making
   glass and soap.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Kali \Ka"li\, n. [Ar. qali. See Alkali.] (Bot.)
   The glasswort (Salsola Kali).
   [1913 Webster]

WordNet (r) 3.0 (2006):

Salsola kali
    n 1: bushy plant of Old World salt marshes and sea beaches
         having prickly leaves; burned to produce a crude soda ash
         [syn: saltwort, barilla, glasswort, kali,
         kelpwort, Salsola kali, Salsola soda]