SEED-VESSEL. Two follicles, one-valved, splitting lengthways from the inside. SEEDS numerous, small, roundish. SPECIFIC CHARACTER. Pergularia foliis cordatis, acutis, apicibus tortis; laciniis corollæ ovatis, erectis, luteis. Pergularia with heart shaped leaves, sharp-pointed and twisted at the ends; the segments of the blossom are egg-shaped, upright, and yellow. REFERENCE TO THE PLATE. 1. The Empalement. 2. A flower cut open. 3. The parts of fructification magnified. 4. Two Scales of the honey-cup as they are attached together, magnified. 5. An outer Scale magnified. 6. An inner Scale magnified. 7. The Seed-buds, Shaft, Summit, and Chives magnified. That a just judgment may be formed, upon what grounds we have taken up a specific distinction, between the only two species we possess of this genus; so dissimilar in our opinion, but, which have been considered as scarcely to be deemed varieties, by much abler botanists than ourselves profess to be; we have given the figures of both in consequence. Much is it to be regretted, that the whole natural order of plants forming the Apocineæ of Jussieu, so charactered in themselves, have not undergone a proper revision, in classification, upon the original Linnæan sexual principles; which, we must suppose, have been left in the present bewildered chaos, from the intricacy, singularity and minuteness of the parts, being so difficult to develope. From critical and actual observations, taken from the living plants, we are in hopes of being able to illustrate, and correct where necessary, the characters of such as may come under our review. Upon the changing the class of this genus, there needs no comment; as most authors seem to allow, though they have not followed the hint, that it is properly Gynandrous; although they have not equally agreed as to the Order; some taking the glands, surrounding the summit, for the chives, and some, for the summits themselves, of a columnar shaft. Dr. Smith, who has figured our other species, has justly taken, the parts fixed to the five glands, for what they certainly are; as may be easily traced through the whole order of Orchideæ, where the chives are nearly similarly placed and so hooded.