This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol2", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
Hypericum canadense var. majus A. Gray, Man. Ed.
Annual or perennial, stouter than H. canadense, stem erect, 1°-3° high, usually branched above, the branches nearly erect. Leaves lanceolate or oblong-lanceolate, sessile or somewhat clasping, 10"-2 1/2" long, 3"-6" wide, acute or obtuse at the apex, 5-7-nerved; cymes several-many-flowered; bracts subulate; flowers 3"-5" broad; sepals lanceolate, acuminate, about as long as the petals or shorter; styles 3; capsule narrowly conic, acute, 4"-5" long, longer than the narrowly lanceolate sepals; seeds minute, cross-lined and faintly longitudinally striate.
In moist soil, Quebec to Manitoba, British Columbia, New Jersey, Illinois and Colorado. June-Sept.
Hypericum canadense L. Sp. Pl. 785. 1753.
Annual or perennial, erect, 6'-2o' high, freely branching. Branches angular, erect or ascending; leaves linear, 6"-2' long, 1"-2" wide, obtuse, tapering to the base, 3-nerved; cymes terminal, several-many-flowered, subulate-bracted; flowers 2"-3" broad; sepals lanceolate, acute, equalling or shorter than the petals; stamens 5-10; styles 3; capsule I-celled, narrowly conic, acute, 2"-4" long, much longer than the sepals; seeds striate.
In wet soil, Newfoundland to Manitoba, Georgia, Kentucky and Wisconsin. Ascends to 5000 ft. in North Carolina. July-Sept.
Sarothra Drummondii Grev. & Hook. Bot. Misc. 3:
236. 1833. H. Drummondii T. & G. Fl. N. A. 1: 165. 1838.
Annual, bushy-branched, 10'-30' high, rigid. Leaves linear-subulate, 4"-12" long, erect or narrowly ascending, 1/2" wide, I-nerved; flowers scattered along the upper part of leafy branches, numerous, peduncled, 2" broad; sepals lance-linear, longer than the petals; stamens 10-20; styles 3; capsule 1-celled, ovoid, 2" long, equalling or shorter than the sepals; seeds large, rugose.
In dry soil, Virginia to Georgia, Ohio, Illinois, Iowa, Kansas and Texas. July-Sept.