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..
A low annual herb, the opposite leaves reduced to subulate scales, the mostly opposite branches erect-ascending, the very small yellow flowers alternate, very short-pedicelled or sessile along them in the axils of still smaller scales. Sepals 5, equal. Petals 5. Stamens 5-10. Styles 3, separate. Capsule elongated-conic, I-celled, much longer than the sepals; seeds striate and pitted. [Greek, a broom.]
A monotypic genus of eastern North America.
Sarothra gentianoides L. Sp. Pl. 272. 1753. Hypericum Sarothra Michx. Fl. Bor. Am. 2: 79. 1803. Hypericum gentianoides B.S.P. Prel. Cat. N. Y. 9. 1888.
Erect, fastigiately branched, 4-20' high. Branches mainly opposite, filiform, erect, wiry; leaves minute, subulate, about 1" long, appressed; flowers nearly sessile, 1"-1 1/2" wide, open in sunlight; sepals linear, about equalling the petals and very much shorter than the conic-cylindric acute purple pod; seeds very small.