Baldwin on Rottbéllia. 355 
and sulphate of iron on the surface of the ground near it. A 
stone containing a few grains of native copper was found in 
Litchfield. 
The red oxide of titanium occurs in Litchfield sparingly. 
A very handsome specimen of the reticulated oxide of titanium, 
was picked up. It was on mica, and the. mica mee an evident 
tendency towards the same form. 
BOTANY. 
9 BOB 1 
T. VI. An account of two North. American Species of Rott- 
béllia, discovered on the Sea-Coast in the e of Georgia, 
by Dr. Wi11am Barpwiy, of Philadelphia. 
Flowers in pairs, or two from each joint of the rachis, one 
neutral. The neutral, or imperfect flowers, pedicillate. 
Rottbéllia corrugata. f 
Coutmo erecto, compresso, sulcato, glabro, ramoso; foliis 
longis angustisque: spicis sub-compressis, nudis super uno 
latere, solitariis et terminalibus, supremis approximatis; caly- 
cis bivalvis, valva exteriori transversé corrugata et longitu- 
dinaliter rugosa : corolla trivalvis. 
Culm erect, compressed, sulcate, smooth, ramose: leaves 
long and narrow: spikes slightly compressed, naked on one 
side, solitary and terminal, approximating towards the summit: 
calyx 2-yalyed, the exterior valve transversely corrugate, and - 
longitudinally wrinkled; corolla 3-valved. Vid Nuttall’s North 
merican Genera, v. I. p. 84.* * 
* Mr. Nuttall will excuse me for retaining my own specific name. His 
knowledge of this plant was derived from my Herbarium, where he found it 
under the name of tripsacum cylindricum, Mich? Although it can hardly 
