Ashes particularly rich in potash are those of burning nettles, wormwood (Artemisia absinthium), tansy (Tanacetum vulgare), fumitory (Fumaria officinalis), and tobacco.
The "bright valley," Clara Vallis of St Bernard, was known as the "valley of Wormwood," infamous as a den of robbers.
Many English place-names contain the word, the most familiar being Shrewsbury (Scrobbesbyrig) and Wormwood Scrubs.
In the low brushwood scattered over portions of the dreary plains of the Kandahar table-lands, we find leguminous thorny plants of the papilionaceous sub-order, such as camel-thorn (Hedysarum Alhagi), Astragalus in several varieties, spiny rest-harrow (Ononis spinosa), the fibrous roots of which often serve as a tooth-brush; plants of the sub-order Mimosae, as the sensitive mimosa; a plant of the rue family, called by the natives lipdtd; the common wormwood; also certain orchids, and several species of Salsola.
The rue and wormwood are in general use as domestic medicines - the former for rheumatism and neuralgia; the latter in fever, debility and dyspepsia, as well as for a vermifuge.