_Nicotiana rugosa_ of Miller, rises with a strong stalk near four feet high; the leaves are shaped like those of the preceding, but are greatly furrowed on their surface, and near twice the size, of a darker green, and no longer on footstalks.
_Nicotiana urens_, or stinging tobacco: leaves cordate, crenate; racemes recurved; stem hispid, stinging. Fructification in racemes directed one way and revolute, with bell-shaped corollas, and cordate leaves like those of Nicotiana rustica; but crenate, and the whole tree prickly. Native of South America.
_Nicotiana glutinosa_, or clammy-leaved tobacco: leaves petioled, cordate quite entire; flowers in racemes, pointing one way, and ringent. Stalk round, near four feet high, sending out two or three branches from the lower parts. Leaves large, heart-shaped, and a little waved.
_Nicotiana pusilla_, or primrose-leaved tobacco: leaves of oblong oval, radical; flowers in racemes, acute. This has a pretty thick taper root that strikes deep in the ground; at the top of it come out six or seven leaves spreading on the ground, about the size of those of the common primrose, but a deeper green. This kind was discovered by Dr. Houstoun at Vera Cruz, and he sent the seed to England.
_Tabacum Minimum_ (Gen. Em. 358.) appears to be another species, hitherto unsettled, with a branched leafy stem, a span high; leaves ovate on footstalks, opposite; and stalked acute, greenish-yellow flowers. The N. minima of Molina (Poir. in Lum. Diet. iv. 481.), is probably another species, or perhaps the same.
Culture.--Tobacco thrives best in a warm, kindly rich soil, that is not subject to be over-run with weeds. In Virginia, the soil in which it thrives best is warm, light, and inclining to be sandy; and, therefore, if the plant is to be cultivated in Britain, it ought to be planted in a soil as nearly of the same kind as possible. Other kinds of soil might probably be brought to suit it, by a surface of proper manure; but we must remember, whatever manure is made use of, must be thoroughly incorporated with the soil. The best situation for a tobacco plantation is the southern declivity of a hill, rather gradual than abrupt, or a spot that is sheltered from the north winds: but at the same time it is necessary that the plants enjoy a free air; for without this they will not prosper.