The Victorian naturalist . October, 1975 205 Table 2 Sample Sodium ppm Potassium ppm Mangrove leaves 700 160 Mangrove stem 120 95 Arthrocnemum leaves 2750 390 Arthrocnemum stem 80 135 Salicornia 3100 475 The use of mangroves as a sourceof alkali seems to be unique to Aus-tralia, although many other plantsare known to have served this purposein other parts of the world^^best barilla, at the end of theeighteenth century, was considered tocome from Spain, where it was ob-tained from the ashes of Salsola soda,SL salt-marsh plant found around theshores of Alicante and Tenerife^^. It

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