A fine hardy species, found by Nuttall on the banks of the Missouri - and grows and blooms in our gardens exceedingly well. The foliage is long and narrow, edged with threads, and quite stiff. The leaves spring out of the ground without a stem, like those of the last variety. The flower stalk is straight, and not branched, like the preceding sorts, the dower bells more oblong, and the flowers a pale greenish white. It blooms at mid-summer, and is a very distinct and ornamental species. Messrs. Hogg, of New-York, have, we believe, cultivated it with success in the open border, for many years.

There are several other species of Yucca which are less known, but which would doubtless succeed in our gardens. Yucca draconii - the Dragon Yucca, a native of Carolina, growing eight or ten feet high, which is hardy in England, would no doubt be so here; but though it is to be found in many of our green-house collections, we do not hear of any one having made trial of it in the open air. There is a variety of Y. ghriosa with striped leaves, which is very ornamental. Y. stricta , and Y. glauceacens are an interesting species, natives of the southern states, that would well repay the labor of cultivation.

We have said enough, however, to call attention to this really noble genus of evergreen plants - whose superb flowers and striking foliage, render them more valuable as ornaments to lawns, gardens, or rock work, than almost any others that we could name. As they are mostly natives of the sea shore, they are also especially valuable to decorate the grounds of the marine cottages and villas that are springing up at Newport, and other sea-side watering places. Most of the sorts we have described may be had at very moderate prices, of our leading plant growers, and nothing but ignorance of their real merits, prevents their being much more generally cultivated.