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 prolificum var. densiflorum A. Gray, Man. Ed. 3, 84. 1867.
Erect, 4°-6° high, shrubby, freely branching, densely leafy; branches somewhat angled and branchlets 2-edged. Leaves crowded, 1'-2' long, 1 1/2"-3" wide, acutish or obtuse, with smaller ones clustered in the axils; cymes densely many-flowered, mainly terminal; pedicels 1"-4' long; flowers 5"-8" broad; sepals narrow, not foliaceous, shorter than the petals; stamens numerous, distinct; styles 3, more or less united; capsule 3-celled, 2"-3" long.
Pine-barrens of New Jersey to Florida, west to Kentucky, Arkansas and Texas. July-Sept.
Hypericum aureum Bartram, Travels 383. 1791.
Perennial, shrubby, 2°-4° high, the twigs 4-sided. Leaves oblong, firm in texture, 1-3' long, obtuse and mucronulate at the apex, narrowed at the base, pale beneath; petioles very short; flowers solitary or 2 or 3 together, sessile, 1'-2' broad; sepals unequal, shorter than the obovate oblique petals; stamens very numerous; styles 3; capsules conic, incompletely 3-celled, nearly 1' long, long-pointed.
Hypericum galioides Lam. Encycl. 4: 161. 1797.
Perennial, somewhat woody, branching, 1°-2 1/2o high, the stems and branches nearly terete. Leaves linear, linear-oblong or oblanceolate, with smaller ones clustered in their axils, obtusish, thick, spreading, narrowed below, V-2Y long, 1"-2" wide, involute in drying; flowers short-pedicelled, 3"-$" broad; sepals narrowly linear, foliaceous, resembling the uppermost leaves, shorter than the pointed oblique petals; stamens numerous, distinct; styles 3; capsule 2"-3" long, incompletely 3-celled by the projecting placentae.
In low grounds, Delaware to Florida, west to eastern Tennessee and Louisiana. July-Sept.
H. adpressum Bart. Comp. Fl. Phil. 2: 15. 1818.
Stem nearly simple, erect or ascending from a perennial creeping or decumbent sometimes spongy-thickened base, 1°-2° high, angled below, 2-edged above. Leaves oblong or lanceolate, 1'-2' long, 3"-5" wide, obtuse, ascending, often with smaller ones fascicled in the axils; cyme terminal, several-flowered, leafy only at the base; pedicels l" - 3" long; flowers 6"-9' broad; sepals lanceolate, acute, about half the length of the petals; stamens numerous, distinct; styles 3 or 4; capsule about 2" long, incompletely 3-4-celled by the projecting placentae.