18S TETRANDRIA. MONOGYNIA. obolahia. 



clefts of the corolla. Stigma bifid. Capsule ovate, 

 I'celled, 2-valved, many-seeded. Gen. pi. 1044. 

 Nutt. Gen.l. p. 103. Juss. p. 101. Nat. Ord. 

 Gentians Juss. (Nutt.J olim Pedicular^s. 



O. virginica L. : Willd. Spec III. p. 326. Gron, 

 Firg. p. 74. Purs A i^/. II. p. 431. E Ui ot t Sk.l]. ■f. 

 134. Nutt,Gen.lc. 



Moot apparently perennial. Stem 3 — 4 inches high, growing in 

 tufts, smooth^ nearly simple. Leavee few, opposite, obovatej 

 sessile, a little glaucous. Fioivers towards the extremity of 

 the stem, white cr pale red, marcescpnt. Calyx, or rather 

 foiiaceous bracts, cleft nearly to the batse, (S-cleft, Pers.) 

 Segments of the corolla ovate, entire, (sometimes cre- 

 nately torn, JVu t t.J ; tube ventricose. Stamens shorter 

 than the corolla ; two of them a little longer ; anthers oblong. 

 Style short ; divisions of the stigma spreading. Capsule ob- 

 tuse. 



Hab. In shady forests. Near Philadelphia. Dr. W. Barton. 

 Near West-Chester, Pennsylvania. Dr. Darlington. 

 April — May. 



The genus Obolaria has, I think, Ijcen very properly re- 

 jnoved to the GENTiANiE by J\fu ttaHo 



122. AMMANNIA. L. 



Calyx 1-leaved, campanulate, plicate, 8-toothed, in 

 ferior. Corolla 4-petalied or 0, inserted upon the calyx. 

 Cc/)We 4-celltd, many-seeded. Gen.pL206. Nutt. 

 Geji. I. p. 103. Juss. p. 333. Lam. III. t. 

 LXXVII. f. 1. Nat. Ord. Salicari^e /«>$ J. 



1. A. ramosior L. : stem erect, thick, subterete ; leaves 

 lanceolate, dilated at the base; lower flowers compactly verti- 

 cillate. Mich. FL I, p. 99. Willd. Spec. I. p. 678, 

 Pursh Fl\. ^. 107. E lliott SkA. ^. 'IIQ, Roern, 

 ^ Schult. III. p. 30fi. 



Root annual. Stem 4 — 8 inches high, obscurely quadrangulary 

 smooth,^ simple, or with a few spreading branches near the 

 base. JLeaves opposite, a little contracted below, but dilated, 

 and somewhat amplexicaul at the bose. Flowers axillary, 

 with 2 subulate bracts at the base, sessile ; tiie upper ones so- 

 litary; lower ones verticillate. Calyx envelloping thq ger- 

 men, truncate, quadrangular, 4-plaited, giving it the appear- 

 ance of 8 minute teeth at the top. Petals caducous, very mi- 

 nute, obovatc, pale-purple, inserted into the palyx, near the 

 top. Stamens alternating with the petals ; anthers globose. 

 Style very short ; stigma obtuse. Cafisuls very obtuse. Seed^ 

 numerous, miniate, flat on ope side. 



