where it had escaped the attention of all the botanists of that city, and in particular of Dr. William Barton, who has therefore omitted it in his Prodr. fl. Philad. and having communicated it to Mr. Correa, he acknowledged that it was dicotyle, of which fact I was aware, even before seeing the plant and dissecting its seed, by attending to its habit. The following exact description of this genus will enable the reader to ascertain how far I am correct in my presumptions towards its natural arrangement. _Floerkea._ Perigone double persistent, sixpartite; the exterior calicinal 3 partile, sepals acute; the interior shorter, coloured 3 partile, sepals petaloid, oblong, obtuse. Six stamens perigyne, filaments filiform, of the length of the interior sepals, anthers round. One free ovarium, rounded and bilobed, one central and bifod style, two capitated stigmas. Fruit a bilobed atricule, tuberculated and bilocular dispermous, sometimes round, unilocular and monospermous by abortion of one lobe and cell. Seeds attached to the centre near the bottom, nearly lenticular, smooth albuminous, easily divided in two lobes. _Habit._ Small, delicate, annual, and glabrous plant, with alternate polytome pinnated leaves, flowers axillar, solitary, pedunculated. _Floerkea uliginosa._ Caule tenello flaccido erecto simplex, foliis 4 petiolatis imis ternatis, summis pinnato, quinatis, pinnulis lineari oblongis obtusis, integris floribus axillaris, solitaris pedunculis longis apice incrastatis. Stem delicate, soft, upright, and simple, leaves petiolated, the inferior ternated, the superior pinnated, quinate, pinnules linear-oblong obtuse, flowers axillar, solitary, and on long peduncles, swelled under the flower. Among the several specific names given to this plant, I prefer Muhlenberg's, as it expresses exactly the kind of situations where it grows, say in moist grounds, occasionally swampish or overflowed; those I found near Philadelphia, grew by thousands on the banks of a small brook in a wood below the left side of the falls of Schuylkill. Persoon's name of _lacustris_, being wrong, as it would seem to imply that it grows in lakes only; and Wildenow's name being too long and illusive, its similarity of habit with the genus _Proserpinaca_ not being very striking. However, even the name of _uliginosa_ is liable to some slight objection; and did I think myself permitted to coin a new name, while so many have been proposed already, I should have called it either _F. tenella_, or _F. flaccida_, or _F. olitoria_, being a very delicate and tender plant, and very good to eat in sallad, as I have tried it myself, its taste is sweet and pleasant, the whole plant may be eaten, (even the root) being all juicy and tender: it grows in such an abundance in some spots, that it might occasionally afford a most precious and delightful sallad, but if cultivated for that purpose, it might be found an agreeable addition to our culinary herbs.