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..
[Mahonia Nutt. Gen. 1: 211. 1818.]
Shrubs, with pinnate leaves of several or many coriaceous leaflets, and yellow racemose flowers, the branches not spiny, but the leaflets often with bristle-tipped teeth. Sepals mostly 6. Petals and stamens of the same number as the sepals. Filaments often dilated; anthers dehiscent by valves. Berries mostly blue or white. [Greek, swollen stamen.]
About 20 species, natives of North America and Asia. Type species: Berberis Aquifolium Pursh.
Berberis Aquifolium Pursh, Fl. Am. Sept. 219.
A low trailing glabrous shrub. Leaves petioled, pinnate; leaflets 3-7, ovate, oval, or nearly orbicular, obtuse or acute at the apex, oblique and obtuse, truncate or slightly cordate at the base, sessile, thick, persistent, finely reticulated, dentate with spine-bearing teeth, 1-2' long; racemes several, erect, dense, terminal, many-flowered; flowers yellow, 3"-4" broad, short-pedicelled; bracts ovate, persistent; berry globose, blue or purple, about 3" in diameter.