STUDIES IN THE BOTANY OF THE SOUTHEASTERN UNITED STATES RUDA EX LANGLOISII Perennial, glabrous, somewhat scurfy, dark green (when dry). Stem erect or ascending, 5-7 dm. tall, simple or with a few nearly erect branches, more or less flexuous, at length strongly furrowed ; leaves oblong or linear-oblong, 3-12 cm. long, acuminate or acutish, erose crenulate, slightly crisped, somewhat prominently nerved es pecially beneath, narrowed into a petiole which is usually I or 2 cm. long ; ocreae very thin, early falling away ; panicle rather open, not leafy, 1-2 dm. long ; racemes strongly ascending, 5—to .cm. long, usually interrupted ; flowers about 2 mm. long, in dense whorls (in fruit) ; pedicels about 5 mm. long, articulated near the base, enlarged towards the end ; wings rather coriaceous, deltoid, 4 mm. long, the sides rounded, the apex blunt, the surface promi nently nerved, each bearing a papillose calosity I mm. broad and
3 mm. long ; achene ovoid, nearly 3 mm. long, abruptly contracted into a very short base, slightly acuminate at the apex, the faces dark red, the angles slightly paler and margined.
Southern Louisiana, New Orleans (Joor, according to Trelease, and Pointe a la Hache (Langlois).
This is Rumex Roridanzts Trelease, but not R. Roth/anus Meisner. With the original specimens of R. Floildanns Meisner at hand I cannot separate them from R. to which Meisner says the species is closely related. Prof. Trelease has given the plant its correct position, but referred it to the wrong species. R. Langloisii is intermediate between R. verticillatus and R. altissanus in these respects : its inflorescence suggests the latter, while its foliage sug gests that of the former.