BASTARD TOWER-MUSTARD; a genus of the filiculosa order, belonging to the tetradynamia class of plants.

Species, &c. Of this genus there are nine different species enumerated by Linnæus. None of them are at all remarkable for their beauty or other properties. Only one of these, the thaliana or mouse-ear, is a native of Britain. It is a low plant, seldom rising more than four or five inches high, branching on every side, having small white flowers growing alternately, which have each four petals in form of a cross, that are succeeded by long slender pods filled with small round seeds. It grows naturally on sandy ground, or old walls. Sheep are not fond of it, and swine refuse it. The other species are, the alpina, grandiflora, bellidifolia, lyra, balleri, Canadensis, pendula, and turrita; they are not at all superior to the thaliana abovementioned, are very hardy, and require no other culture than to be kept clear of weeds.