GENTIAN A CEAE. 73 5 



ing to the 4-parted flowers.] About 30 species, natives of N. Am., S. Am. and 

 Asia. Besides the following, another occurs in the southwestern U. S. 



i. Tetragonanthus deflexus (J. E. Smith) Kuntze. SPURRED GENTIAN. 

 (I. F. f. 2885.) Annual; stem 1.5-5 dm. high- Basal leaves obovate or spatulate, 

 obtuse, narrowed into petioles; stem-leaves ovate or lanceolate, acute, sessile. 3-5- 

 nerved, 2-5 cm. long, the uppermost smaller; calyx-segments acute or acuminate; 

 corolla purplish or white, about 8 mm. high, its lobes ovate, acute, the spurs de- 

 flexed or descending, one-fourth to one-half the length of the corolla; capsule 12- 

 14 mm. long, about twice as long as the calyx. . In moist woods and thickets, Lab. 

 to Mass., N. Y., Mich, and the Ind. Terr. July-Ang. 



Tetragonanthus deflexus Brentonianus (Griseb.) Britton. Low, 0.7-2 dm. high; 

 spurs shorter and thicker, perhaps specifically distinct. Newf. to Anticosti and Lab. 



Tetragonanthus deflexus heteranthus ^Griseb.) Britton. Corollas spurless, or only 

 the earliest spur-bearing, the lower flowers mostly smaller than the upper. Newf. to 

 Me. \_Halenia heterantha Griseb.] 



8. OBOLARIA L. 



A low glabrous perennial herb, the lower leaves reduced to opposite scales, the 

 upper foliaceous, subtending the racemose-spicate or thyrsoid. white or purplish 

 flowers. Calyx of 2 spatulate sepals. Corolla oblong-campanulate. 4-cleft, the 

 lobes imbricated, at least in the bud. Stamens 4, inserted in the sinuses of the 

 corolla. Ovary I -celled, with 4 internal placenta! projections; ovules numerous; 

 style distinct; stigma 2-lamellate. Capsule ovoid, 2-valved or irregularly burst- 

 ing. Seeds minute, covering the whole interior of the capsule. [Greek, obolus, 

 a coin, alluding to the thick round leaves.] A monotypic genus. 



i. Obolaria Virginica L. PENNYWORT. (I. F. f. 2886.) Stems 7-15 cm. 

 high from a perennial root of thick fibres, bearing 2-6 pairs of thick small ob- 

 tuse scales. Floral leaves broadly obovate -cuneate, obtuse, purplish, 8-12 mm. 

 long; flowers sessile or nearly so in the axils, in clusters of 1-4, and terminal; 

 corolla about i cm. long, cleft to about the middle, the lobes oblong, obtuse; 

 stamens included; capsule 5 mm. long. In rich woods and thickets, N. J. to Ga., 

 111. and Tex. April -May. 



9. BARTONIA Muhl. (See Appendix.) 



Slender or filiform erect glabrous annual or biennial herbs, the leaves reduced 

 to minute opposite scales, or these sometimes alternate, and small white or yel- 

 lowish racemose or paniculate flowers, or these rarely solitary and terminal. Calyx 

 deeply 4-parted, the segments acuminate, keeled. Corolla campanulate, deeply 

 4-cleft, the lobes imbricated in the bud. Stamens 4, inserted at the sinuses of the 

 corolla. Ovary i-celled, the placentae intruded; ovules numerous; style short or 

 none; stigma 2-lobed. Capsule ovoid-oblong, acute, 2-valved. Seeds minute, 

 covering the whole inner surface of the capsule. [In honor of Professor Ben- 

 jamin Smith Barton, 1766-1815, of Philadelphia.] 



Corolla yellowish, 3-4 mm. long, its lobes oblong. i. B. Virginica. 



Corolla purplish tinged, 4-5 mm. long, its lobes broadly oblong. 2. B. iodandra. 



Corolla white, 6-8 mm. long, its lobes spatulate. 3. B. verna. 



1. Bartonia Virginica (L.) B.S.P. YELLOW BARTONIA. (I. F. f. 2887.) 

 Stem almost filiform, 1-4 dm. high, simple, or with few erect branches above, 

 5 -angled, yellowish green. Subulate scales 2-4 mm. long, appressed; flowers 

 mostly opposite, peduncled; peduncles ascending or erect, 4-12 mm. long; corolla 

 somewhat exceeding the calyx; stamens included; stigma 2 mm. long; ovary 4- 

 sided; capsule about 3 mm. long. In moist soil, Newf. to Fla., Mich, and La. 

 July-Sept. [B. lenella Willd.] 



2. Bartonia todindra Robinson. PURPLISH BARTONIA. Stem 4-25 cm. 

 high, simple or alternately branched above the middle. Scales alternate, 2-3 mm. 

 long; pedicels mostly i-flowered; corolla distinctly purplish, about twice as long 

 as the calyx, its lobes obtusish, mucronate; stigma short, thick. In sphagnum, 

 Newf. to N. J. [B. Museri of 111. F!., in part.] 



3. Bartonia verna (Michx.) Muhl. WHITE BARTONIA. (I. F. f. 2888.) Stem 

 usually simple, o;5-4 dm. high, racemotely or corymbosely i- several-flowered. 



