TETRANDRIA, MONOGYNIA, 
gr> 
in his late work (1817), Anleitung zur Kenntniss der Genjodchsei of 
which I have been favoured with two volumes from the author, 
has boldly imposed the name Andrewsia, after Mr. Andrews, ^ 
the well-known author of a beautiful work on the Roses ; and 
I have, without hesitation, followed him, for this reason, among 
others, which doubtless actuated Sprengel in giving the new 
name, that Centaurella, as the diminutive termination of Cen- 
taurium, a genus already established, is in direct violation of 
the commonly received rules for botanical nomenclature : but 
a more cogent motive is, that the name Bartonia, formerly 
given by Dr. Muhlenburg, may be entirely disused, as applied 
to this plant. A splendid genus, first discovered by Mr. 
Nuitall on the borders of the Missouri, he has, with a very 
honourable sense of the genius, learning, and botanical attain- 
ments of the late Professor Barton, dedicated to him ; in which 
name Mr. Pursh acquiesced, and published in his Flora. 
Andrewsia paniculata is easily recognized by its nearly sim- 
ple, upright, rigid yellowish stem, and inconspicuous whitish 
flowers. It grows among mosses, and particularly among 
sphagnum, in the cranberry. swamps of Jersey. It is not very 
frequent ; and on the Pennsylvania side is more rare. It de- 
lights in shade, moisture, and retirement. Annual. September. 
83. OBOLARIA. Gen.pl. 1044. (GentianceJ 
Calix 0, or in the form of 2 bractes. Corolla 
campanulate, 4-cIeft, segments entire, (the 
margin sometimes crenately torn.) Stami- 
na equal, proceeding from the clefts of the 
corolla. Stigma emarginate. Capsule ovate, 
1- celled, 2-valved, many-seeded ; seeds mi- 
nute. — Nutt. , 
viieinica. 1. O. Stem simple ; leaves oblong truncate, fleshy, 
purple underneath ; flowers axillary solitary, ses- 
sile. — Wit Id. and Pursh. 
Icon.’Pluk. aim. t. 209, f. 6. 
A very beautiful and interesting little plant, seldom attaining 
a greater height than three inches. Root branching. Leaves 
opposite, apple green above, pale purple underneath, some- 
what fleshy. Flowers collected by pairs or threes towards the 
top of the stem; they are of a skimmed milk-white colour, 
and form, with the numerous conspicuous, purplish bracteas, 
a delicate and pleasing contrast. The whole plant has the 
appearance of an artificial wax flower. Very rare. On the 
bigli banks of the Wissahickon, about three quarters of a mile 
