454 C. GENTIANACE^E. SWERTIA. 



8. G. DETONSA. SJwrn or Slightly-fringed Gentian. 



St. nearly strict, simple or branched ; Ivs. oblong-lanceolate or linear, the 

 lowest rosulate, spatulate ; ped. 1-flowered, very long, subsolitary; cal. 4( 5)- 

 cleft, lobes ovate and lanceolate, nearly equaling the corolla ; cor. lobes round- 

 ish-obtuse, ciliate and crenate-ciliate, erect-spreading ; stig. distinct. N. Y., 

 Wis. Laphaml N. to Hudson's Bay. A fine species, with large blue flowers. 

 Stem a loot high. Leaves 1 2' by 1 3'', tapering to an acute point. Pedun- 

 cles 4 7' long, each with a single large, erect, showy flower. Cor. 15 20" 

 long, obconic or bell-shaped, blue. 



6. CENTAURELLA. 



Name a Latin diminutive of Centaurea. 



Flowers tetramerous ; sepals appressed ; corolla subcampanulate ; 

 petals slightly united, nearly erect, stigma thick, glandulous, some- 

 what bifid ; capsule 1 -celled, 2-valved, invested by the permanent 

 calyx and corolla ; seeds many. .2V. American, slender, erect herbs 

 with scale-like leaves and small white flowers. 



1. C. AUTUMNALIS. Pursh. (Bartonia tenella. Muhl. C. paniculata. Me.) 

 Screw-stem. St. smooth, branching above, branches subdividided ; Ivs. 



subulate, minute; panicle erect, many-flowered; cal. equaling the corolla; sly. 

 much shorter than the ovary. A slender and nearly naked plant, 5 8' high, of 

 a yellowish-green color. Native in wet grounds, Mass, to Ga. Stem square, 

 often twisted, with very minute, bract-like leaves, which are mostly opposite. 

 Peduncles opposite or terminal, simple or branched. Pedicels bracteate at base, 

 i' in length. Calyx segments linear-lanceolate, acute, shorter than the oval 

 segments of the corolla. Cor. white, small, bearing the stamens at its clefts. Aug. 

 /?. fcstivalis. (C. aestivalis. PA.) Cor. segments oblong, obtusish, twice longer 

 than the calyx ; ova. attenuated at apex. In Penn. Pursh. 



2. C. MOSERI. Stendel. Moser's Centaurella or Screw-stem. 



Cyme racemiform ; branches alternate, spreading, racemiform ; cor. seg- 

 ments ovate, acute, twice longer than the calyx segments ; ovary oblong, obtuse ; 

 sty. 0; Ivs. mostly alternate. In Penn., Moser, in DC. Prod. 9; 121. 



7. HALENIA. Borkh. 



Flowers tetramerous ; corolla short campanulate, petals spurred at 

 base, with glands at the base of the spur within ; stigmas 2, termi- 

 nating the acuminate ovary 5 capsule 1 -celled ; seeds indefinite, fixed 

 to the sutures of the valves. Erect, branching. 



H. DEFLEXA. Griseb. (Swertia corniculata. MX. S. deflexa. Shit.) Fel- 

 wort. St. erect, leafy; Ivs. 3 5-veined, radical ones oblong-spatulate, 

 tapering into a petiole, cauline ones oblong-lanceolate, acute, sessile ; spurs 

 cylindric, obtuse, deflexed, half as long as the corolla. () Swamps, Can., Ban- 

 gor, Maine, Miss Towle! N. Y., rare. Stem about 18' high, obtusely 4-angled, 

 smooth, with few branches above. Leaves opposite, 1J 2' long, as wide, 

 smooth. Flowers greenish-yellow, in terminal fascicles. Sepals linear-lanceo- 

 late, half as long as the petals. Corolla persistent, with 4, spreading horns or 

 spurs descending betwen the sepals. Seeds numerous, obtuse, yellow. Aug. 



8. SWERTIA. 



Calyx 5 4-parted ; cor. marescent, rotate, 5 4-parted, without 

 crown or folds, each segment with a glandular pit fringed at the mar- 

 gin ; sta. 5 4, inserted in the throat ; anth. nodding ; ova. 1-cellcd ; 

 sty. ; caps. 1 -celled, many-seeded. i\- 



S. PUSILLA. Ph. 



St. simple, 1-flowered; Ivs. oblong; cal. segments obtuse, half as long as 

 the large corolla; cor. rotate, segments oblong-acuminate. White Hills, N. H., 

 Pursh. Stem an inch or two high, with one or two pairs of small leaves and a 



