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 creeping tufted much-branched evergreen shrub, with small narrow alternate imbricated leaves, and numerous white or pinkish sessile flowers, solitary at the ends of the branches. Calyx bracted at the base, the sepals oblong, ciliate. Corolla short-campanulate, 5-lobed, tardily deciduous. Stamens inserted at the sinuses of the corolla; filaments broad and thick; anthers 2-celled, the sacs globose, transversely 2-valved, the lower valve cuspidate; staminodia none. Style columnar. Seeds globose-oblong, amphitropous, the testa black, cancellate. [Greek, box-anther.]
A monotypic genus of eastern North America.
Pyxidanthera barbulata Michx. Fl. Bor. Am. 1: 152. pl.
17. 1803. Diapensia barbulata Ell. Bot. S. C. & Ga. 1: 229. 1817.
Glabrous, or sparingly pubescent, very leafy, growing in mats or large patches on the ground, the main branches sometimes 1° long. Leaves sessile, linear, lanceolate or linear-oblong, acuminate or subulate-tipped, entire, pubescent at the base when young, 2"-4" long, about 1" wide, densely imbricated toward the ends of the branches, more scattered below; flowers usually very numerous, 2"-3" broad, mostly white; corolla-lobes cuneate-obovate, obtuse, retuse or eroded; capsule about 1" high, globose, sessile, surrounded by the upper leaves.