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..
Turritis glabra L. Sp. Pl. 666. 1753.
Arabis glabra Bernh. Verz. Syst. Erf. 195. 1800.
Arabis perfoliata Lam. Encycl. 1: 219. 1783.
Biennial, erect, glabrous and decidedly glaucous above, pubescent at the base, nearly simple, 2°-4° high. Basal leaves petioled, 2'-10' long, oblanceolate or oblong, dentate or sometimes lyrate, hairy with simple pubescence, or with hairs attached by the middle; stem-leaves sessile, with a sagittate base, glabrous, entire or the lower sparingly dentate, 2'-6' long, lanceolate or oblong, acutish; pedicels 2"-6" long, erect; flowers yellowish-white, 2" broad; petals slightly exceeding the calyx; pods narrowly linear, 2'-3' long, 1/2" wide, strictly erect and appressed; seeds marginless; style none.
15. 1890. A. laevigata laciniata T. & G. Fl. N. A. 1: 82. 1838.
Glaucous, entirely glabrous, 1°-3° high, nearly simple. Basal leaves petioled, spatulate or obovate, sharply and deeply dentate, or sometimes laciniate, 2'-3' long; stem-leaves sessile, lanceolate, or the upper linear, acute, entire or dentate, usually clasping by an auricled or sagittate base; pedicels ascending or spreading, 4"-5" long in fruit; flowers greenish white, 2"-3" high; petals nearly twice the length of the calyx or less; pods 3'-4' long, 1" wide, recurved-spreading; seeds in 1 row, oblong, broadly winged; style almost none.
In rocky woods, Quebec to Ontario, South Dakota, Georgia and Arkansas. April-June.
Arabis serķtina Steele, found at Millboro, Virginia, differs in being widely branched, its narrower leaves not clasping, its flowers smaller, appearing in August.
Arabis viridis Harger, a recently proposed New England species, differs in being green, more leafy, the pedicels erect in flower, the petals longer.
Arabis canadensis L. Sp. Pl. 665. 1753.
Stem nearly simple, 1°-3° high, pubescent below, glabrous above. Basal leaves narrowed into a petiole, blunt but sometimes acutish, dentate or lyrately lobed, 3'-7' long; stem-leaves sessile, not clasping, lanceolate or oblong, narrowed at each end, toothed, or the upper entire, pubescent; pedicels hairy, ascending and 2"-4" long in flower, spreading or recurved and 4"-6" long in fruit; flowers greenish-white, 2"-3" long; petals twice as long as the calyx; pods 2'-3 1/2' long, 1 1/2"-2" broad, scythe-shaped, pendulous; seeds in 1 row in each cell, oblong, wing-margined; style almost none.
In woods, Maine, Vermont and Ontario to Georgia, west to Minnesota, Kansas, Arkansas and Texas. Ascends to 4200 ft. in North Carolina. June-Aug.