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The true nasturtium or Indian Cress cultivated in gardens as a creeper has brilliant orange-red flowers and produces the seeds which serve as a substitute for capers in pickles.
The poisonous Marshwort or 'Fool's Cress' is often mistaken for Watercress, with which it is sometimes found growing. It may readily be distinguished by its hemlock-like white flowers, and when out of flower, by its finely toothed and somewhat pointed leaves, much longer than those of the watercress and of a paler green. The Latin name 'Nasturtium' is derived from the words nasus tortus (a convulsed nose) on account of its pungency.
---Constituents---A sulpho-nitrogenous oil, iodine iron, phosphates, potash, with other mineral salts, bitter extract and water. Its volatile oil rich in nitrogen combined with some sulphur in the sulpho-cyanide of allyl.
---Medicinal Action and Uses---Watercress is particularly valuable for its antiscorbutic qualities and has been used as such from the earliest times. As a salad it promotes appetite. Culpepper says that the leaves bruised or the juice will free the face from blotches, spots and blemishes, when applied as a lotion.
---Dosage---Expressed juice, 1 to 2 fluid ounces.
Watercress has also been used as a specific in tuberculosis. Its active principles are said to be at their best when the plant is in flower.
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