454 C. GENTIANACEZ. SWERTIA. 
8. G. petonsa. Shorn or Slightly-fringed Gentian. 
St. nearly strict, simple or branched ; dvs. 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. Lapham! N. to Hudson’s Bay. A fine species, with large blue flowers. 
Stem a foot 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, obeonic 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.—@OV. American, slender, erect herbs 
with scale-like leaves and small white flowers. 
1. C. aurumNA.is. Pursh. (Bartonia tenella. Mudl. C. paniculata. Mz.) 
Screw-stem.— St. smooth, branching above, branches subdividided; lvs. 
subulate, minute ; panicle erect, many-flowered; cal. equaling the corolla; sty. 
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, 
1/in length. Calyx segments linear-lanceolate, acute, shorter than the oval 
segments of the corolla. Cor. white, small, bearing the stamensat itsclefts. Aug. 
B. estivatis. (C. estivalis. Ph.) Cor.segments oblong, obtusish, twice longer 
than the calyx; ova. attenuated at apex.—In Penn. Pursh. 
2. C. Moséri. 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; lvs. mostly alternate.—In Penn., Moser, in DC. Prod. 9; 121. 
7.M ALENIA. 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. periexa. Griseb. (Swertia corniculata. Mz. 8. deflexa. Sm.) Fel- 
wort.—St. erect, leafy; lvs. 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, 14—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 
erown 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. 0; caps. 1-celled, many-seeded.—% 
S. pusitia. Ph. 
St. simple, 1-flowered ; dvs. oblong; cal. segments obtuse, half as long as 
the large corolla; cor. rotate, segments cblong-acuminate.— White Hills, N. H., 
Pursh, Stem an inch or two high, with one or two pairs of small leaves anda 
