Protologue Description: D. megasperma, n. sp. (Figs. 6-8). Perennial; caudex stout and branching: flowering stems 2 to 25, 1-3 dm. high, simple or loosely branched, scabrous-puberulent with stellate hairs, remotely leafy: basal rosettes numerous; their leaves spatulate, harsh with canescent-stellate hairs, entire or rarely dentate , 1-3 cm. long; cauline leaves, 3 to 10, oblong-ovate, sub-entire, 1-1.5 cm. long, sparingly stellate, racemes loose; pedicels sub-ascending, in fruit becoming 1.5-5 mm. long, glabrate: siliques elliptic, flat or barely twisted, 5-11 mm. long, 3-4 mm. broad, sparingly harsh-stellate, finely glabrate; stigmas sub-sessile: seeds not crowded.- QUEBEC, gravelly beach, Paspébiac Lighthouse, Bonaventure County, July 26, 1902 (Willliams & Fernald).