58 HYPER ICACE^E. 



leaves crowded, narrow-oblanceolate, obtuse ; cymes fastigiate, 3 7-flow- 

 ered ; sepals ovate-lanceolate, about half as long as the petals. 



Banks of streams and in swamps. Can. and around the great lakes. Falls 

 of Niagara. N. J. July, Aug. A shrub about 2 feet high. Flowers smaller than 

 in the preceding. The var. elongatum of Macnab occurs in a swamp about 

 8 miles S. of New Brunswick, N. J. The branches are more elongated, the 

 leaves more obtuse, and the flowers smaller than in the specimens from Niagara 

 Falls. Kalm's St. John's Wort. 



** Stamens numerous. Styles mostly 3. Flowers yellow. 



3. H. angulosum Mich. : stem herbaceous, square, erect ; leaves distant, 

 elongated, ovate, subclasping, sinuate on the margin, acute, not punctate ; 

 flowers axillary, solitary, in a dichotomous panicle ; sepals lanceolate, acute, 

 somewhat keeled. H. denticulatum Walt. 



Cedar swamps. N. J. to Flor. June, July. r ft r . Stem 12 18 inches high, 

 branched towards the summit. Flowers scattered in the panicle and alternate, 

 orange-colored. Styles 3, often united. Angular St. John's Wort. 



4. H. adpressum Bart. : stem 2-winged above ; leaves linear-lanceolate 

 or linear-oblong, closely sessite, pellucid-punctate ; cyme few-flowered, 

 naked ; sepals very unequal, oblong and obovate, at length reflexed ; petals 

 oblong-obovate, twice as long as the sepals. 



Swamps. N. J. Penn. W. to Ark. Aug., Sept. ^..Stem 2 feet high, 

 somewhat shrubby at base. Flowers in compound cymes. Stamens very nu- 

 merous. Winged St. John's Wort. 



5. H. ellipticum Hook. : stem square, simple below, somewhat branched 

 above; leaves elliptic, very obtuse, closely sessile, pellucid-punctate; cyme 

 nearly naked ; sepals oblong, very unequal, spreading ; capsule ovate-glo- 

 bose. 



Moist grounds. Can. to Penn. July. 9|. Stem 10 20 inches high. Flowers 

 pale orange. Styles 3, connate nearly to the summit. 



Elliptic St. John's Wort. 



6. H. corymbosum Muhl. : stem terete, black punctate ; leaves ovate lance- 

 olate, obtuse, sub-clasping ; flowers in dense corymbs ; sepals ovate, acute ; 

 petals oblong. H. punctatum Torr. Comp. 



Shady woods. Can. to Penn. W. to Miss. June. *2J.. Stem 2 feet high. 

 Flowers in a compact panicle or corymb. Styles 3, longer than the stamens. 

 Whole plant, except the filaments and styles, spotted with black dots. 



Corymbed St. John's Wort. 



7. H. perforatum Linn. : stem ancipital ; leaves obtuse, ovate-elliptic, and 

 with the lanceolate sepals pellucid-punctate ; flowers panicled ; anthers with 

 black punctures ; styles diverging. 



Fields, pastures, &c. Throughout Can. and the U. S. June Aug. QJ.. 

 Stem 1 2 feet high, branched. Flowers numerous. Stamens mostly in three 

 sets. A pernicious weed, producing, according to Dr. Darlington, troublesome 

 sores upon horses and horned cattle, where it comes in contact with them. Tt 

 would seem that the dew which collects on the plant, becomes active in this 

 way. Fl> Cest. Introduced from Europe. Common St. John's Wort. 



8. H. mutilum Linn. : stem erect, much branched, smooth, square ; leaves 

 ovate, subcordate, obtuse, sessile, obscurely 5-nerved, pellucid-punctate ; 

 flowers in a dichotomous corymb ; sepals lanceolate, longer than the petals. 

 H. quinquenervium Walt. Mich. H. parviflorum Willd. 



