It forms a small shrub from 5 to 8 feet high, covered with gray bark, and with slender upright branches; the flowers are greenish, very small, the female flowers have shorter and thicker peduncles; they blossom in June. It grows on the Catskill mountains near the two lakes. It is, perhaps, the _Ilex canadensis_? of Michaux and Pursh. And it has some analogy with the _Frangula alnifolia_. 3. _N. G. Polanisia._ Calyx 4 phylle, phylles coloured unequal, the upper one unguiculated spatulated. Corolla with 4 unequal petals, the two upper ones larger and unguiculated. A nectarium upwards glandular, broad, and truncated. Stamina 9 to 14, unequal, erect, hypogynous. Ovary oblong on a short pedicel, one style, one truncated stigma. Fruit a follicular capsule, one celled, two valved, many seeded, seeds inserted on each side of each suture, nearly snail-shaped. The type of this genus is the _Cleome dodecandra_ of Linnæus, under which denomination many species were blended, which have no similitude with the real genus _cleome_, differing in the calyx, corolla, nectarium, stamina, and fruit. I shall describe here that of North America, where 2 or 3 species exist, besides those of the West Indies, Africa, and Asia, which are totally different. The etymology of the name which I have given to it, derives from _many irregularities_. It belongs in the analytical method of botany, to the first natural class _Eltrogynia_, ninth natural order _Monostimia_, natural family _Capparidia_. It can find no place in the sexual system since the number of stamina varies from 9 to 14, unless it be forced into _Dodecandria_. _Polanisia graveolens._ Clammy polanisia--hairy and glutinous all over, stem upright, leaves alternate, petiolate, ternated, folioles sessile, the intermediate longest, oblong, obtuse, entire, hairy on the margin and nerves: flowers racemose erect, bracteas petiolate, ovate, obtuse, calyx hairy, petals emarginate, crenate, capsules divaricate glutinous. It is the _Cleome dodecandra_ of Michaux and Pursh. It grows on the banks of rivers and lakes, on the Hudson near Newburgh, on the Susquehannah near Harrisburg, on Lake Erie, on the Ohio, and Mississippi, &c. It blossoms in July and August, the stem rises about 1 foot, the petals are white, or slightly red. The whole plant has a strong graveolent smell, similar to that of _Erigeron graveolens_. (Received January, 1818. _Editor._) ART. X. _Notice on the Myosurus Shortii._