454 C. GENTIANACE^. Swertu. 



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



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

 lowest rosulate, spatulate ; ped. l-flowered, ver)"- long, subsolitary; cal. 4( — 5)- 

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

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

 Wis. Z>«;Vi«??i .' N. to Hud.son's Bay. A fine species, with large blue flowers. 

 Stem a loot high. Leaves 1 — 2j' 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, glaudulous, some- 

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

 calyx and corolla ; seeds many. — (DiV. American., slouler, erect herbs 

 with scale-like leaves and small while flowers. 



1. C. AUTUMNALis. Pursh. (Bartonia tcncUa. Miihl. C. paniculata. Mr.) 

 Screw-slcm. — SL smooth, branching above, branches subdividided; Ivs. 



subulate, minute ; p«?i./cte erect, many-flowered; cal. equaling the corolla; sly. 

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

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

 often tv/isted, 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. 

 15. (tstivalis. (C. aestivalis. P/;.) C^r. segments oblong, obtusish, twice longer 

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



2. C. MosERi. Stendel. Moser's Centaurella or Screro-stcm. 



Cyme racemiform; branches alternate, spreading, racemiform ; cm-, seg- 

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

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



7. HA LENT A. 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 ; capsule 1 -celled ; seeds indefinite, fixed 

 to the sutures of the valves. — Erect., branching. 



H. DEFLEXA. Griseb. (Swertia corniculata. Mx. S. deflexa. Sm.') FeU 

 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. — (g) Swamps, Can., Ban- 

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

 smooth, with few branches above. Leaves opposite, lA — 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-cellod; 

 sty. ; caps. 1-celled, many-seeded. — % 



S. PUSILT.A. Ph. 



St. simple, l-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, Avith one or two paiis of small leaves and a 



