464 C. GENTlANACEiE. . Swertia. 



8. G. DETONSA. SkoTJi OX SKgliLlij-f ringed Genlian. 



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

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

 clelt, lobes ovate and lanceolate, nearly equaling the corolla; cor. lobes rouna- 

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

 Wis. i«7Vi«?«.' N. to Hudson's Bay. A fine species, with large blue flowers. 

 Stem a toot 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, blite. 



C. CENTAURELLA. 



Name a Latin dimimitive ol'Centaurea. 



Flowers tetramerous ; sepals aj^pressed ; corolla subcampanulate ; 

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

 what bitid ; capsule 1 -celled, 2-Aralved, invested by the permanent 

 calyx and corolla ; seeds many. — ®N. American., slender., erect herbs 

 with scale-like leaves and small white flowers. 



1. C. AUTUMNALis. Pursh. (Bartouia tcnella. Muld. C. paniculata. Mr.^ 

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



bubulate, minute; panicle erect, many-flowered; cal. equaling the corolla; sti/. 

 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 squarCj 

 often twisted, with ver}'- minute, bract-lite leaves, which are mostly opposite. 

 Peduncles opposite or .terminal, simple or branched. Pedicel^ bracteate at base, 

 V 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. 

 /?. ceslivcdis. (C. aestivalis. P/t.) C^'r. segments oblong, obtusLsh, twice longer 

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



2. C. MosERi. Stendel. Moscr's Centaurella or Screw-stem. 



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

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

 ily. 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 ovai'y ; capsule 1 -celled; seeds indefinite, fixed 

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



H. DEFLEXA. Griseb. (Swertia corniculata. Mz. S. deflexa. Sm.') Fcl- 

 iiHtrl. — 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 Toidel 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-celled; 

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



S. PUSILT,A. Ph. 



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

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

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



