" PRTRANDRIA. MONOGYNIA. 105 
ba Speck + . ‘Walteri, From Canada to Carolina. 
| Jn the dry and ‘open. woods of western Pennsylvania and 
=. s w-York, in certain localities abundant. It is there 
ee called Columbo-root, and appears ‘to be atonic no ie: ine 
~« ferior to the Gentiana lutea. 
A genus peculiar to the United States. 
ase OBOLARIA. L 
i Calix 0, or in the form of 2 bractes. Corolla — 
_ campanulate, 4-cleft, segments entire, (the mar- 
gin sometimes Crenately torn.) Stamina equal, 
proceeding from the clefts of the corolla. Stig-= 
ma emarginate. Capsule ovate, 1-celled, 2-val¥- 
ed, many-seeded; seeds minute. 
A very small vernal plant, witha simple stem, and op- 
posite leaves; flowers sessile, terminal and marcescent,, 
«ollected by pairs or by threes towards the summit of the 
“stem; stigma minutely bifid. (Bitter, and probably tonic.) 
Sprcies. 1. O. virginica. Perennial? about 3 or 4 
inches high, with a small branching root; leaves thick, 
green, almost carnose, frequently purplish on the un- | 
der side; flowers bluish-white, subtended by foliaceous: 
bractes. 
Peculiar to. North America—In the neighbourhood of. 
Philadelphia, rare-—Dr. W. P. Barton. Near West Ches- 
ter, (Pensylvania.)—Dr. W. Darlington. Abundant- in 
the shady forests of Lake Erie, (Ohio. ) In the revision: 
and. arrangement of this genus, which distinetly apper- 
tains to the Natural Order Gentianee of Jussieu, 1 am hap- 
py to have been corroborated by the interesting remarks. - 
of Dr. W. Darlington, who for four years in succession. 
has been in the habit of examining the Qbolaria.. 
tt Flowers tetrapetalous. 
153. AMMANNIA. L. pe 
Calix 1-leaved, striate, 8-toothed, inferior. 
Corolla of 4 petals, or none, inserted upon the = 
calix. Capsule 4-celled, many-seeded. . 
Subaquatic herbs with opposite leaves; flowers very 
axillary, sessile, or shortly pedunculate, opposite, . 
and sometimes almost verticillate. In .2. indica, and 2. 
mt oat is a wee, than the 
