It is found in the form of its acid potassium salt in many plants, especially in wood-sorrel (Oxalis acetosella) and in varieties of Rumex; as ammonium salt in guano; as calcium salt in rhubarb root, in various lichens and in plant cells; as sodium salt in species of Salicornia and as free acid in varieties of Boletus.
Elongata which produces the " henequen " fibre, or sisal hemp, of Yucatan, silk or tree-cotton (Ceiba casearia), sugar-cane, cotton (Gossypium), indigo and " canaigre " (Rumex hymenosepalus) whose root contains a large percentage of tannin.
These are: Festuca pulchella, Carex microstyla, Salix caesia, Rumex nivalis, Alsine aretioides, Aquilegia alpina, Thlaspi rotundifolium, Saxifraga Seguieri, S.
17); when they proceed at right angles, as in Rumex Acetosella, the leaf is hastate or halbertshaped.
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