PLOUGHMAN'S SPIKENARD, a genus of the polygamia superflua order, belonging to the syngenesia class of plants. Of this genus there are seven species, all natives of warm climates; but none of them merit notice except the two following. 1. The ivifolia, or African tree-groundsel, is a native of the Cape of Good Hope, as also of Peru and other warm parts of America. It grows to the height of five or six feet; and though there is little beauty in the flower, has been long admitted into the gardens of the curious. It is pretty hardy, and will live abroad in moderate winters in England, but is usually kept in green-houses, and placed abroad only in summer. It may be propagated either by cuttings, or by seeds, which ripen well in this country. 2. The halimoflora, or Virginia groundsel-tree, is a native of Virginia and other parts of North America. It grows about seven or eight feet high, with a crooked shrubby stem; and flowers in October: the flowers are white, and not very beautiful; but the leaves continuing green, has occasioned this shrub to be admitted into many curious gardens. It may be propagated by cuttings; and will live very well in the open air, though severe frost will sometimes destroy it.