POL YG ON A CEA . 355 



stamens exserted; achene less than 2 mm. long, very granular, exceeding the 

 persistent calyx, its angles not margined. In dry fields and on hillsides through- 

 out N. Am. except the extreme north. In large part naturalized from Europe. 

 Sometimes a troublesome weed. May-Sept. 



2. Rumex hastatulus Muhl. ENGELMANN'S SORREL. (I. F. f. 1300.) Per- 

 ennial from a woody base, glabrous, dioecious; stem rather strict, erect, 10-40 cm. 

 tall. Leaves hastate, oblong or oblanceolate, 2-10 cm. long, the basal numerous, 

 auricled at the base, subacute, petioled, those of the stem linear, all papillose; 

 ocreae silvery, 2-parted, at length lacerate; racemes ascending, at length inter- 

 rupted; calyx green, winged in fruit; pedicels equalling or longer than the wings; 

 wings mostly broader than high, cordate, 2-4 mm. long; stamens slightly exserted; 

 achene reddish, smooth, shining, less than 2 mm. long, invested by the calyx- 

 wings, its angles margined. On the seacoast, S. N. Y. to Fla. and on the plains 

 from Kans. to Tex. March-Aug. 



3. Rumex Acetosa L. SORREL. SOUR DOCK. (I. F. f. 1301.) Perennial, 

 glabrous, dioecious; stem erect, simple, grooved, 30-90 cm. tall. Leaves oblong- 

 hastate or ovate- sagittate, 2-12 cm. long, acute, crisped on the margins, the basal 

 few, long-petioled, the upper subsessile, the acute auricles entire or I -toothed and 

 more or less reflexed; ocreae lacerate; racemes nearly erect, crowded, at length 

 interrupted; calyx green, 2 mm. long, winged in fruit; pedicels equalling or shorter 

 than the wings, jointed; wings cordate, 4-5 mm. long; achene rather more than 

 2 mm. long, pointed, smooth, shining, blackish, invested by the calyx- wings. 

 Lab. to Alaska. Naturalized from Europe in Vt., N. Y. and Penn. Summer. 



4. Rumex venosus Pursh. VEINED DOCK. (I. F. f. 1302.) Perennial by a 

 woody rootstock, glabrous, stem rather stout, erect, somewhat flexuous, 15-40 cm. 

 tall, grooved, branched. Leaves ovate to oblong, 2-12 cm. long, acute at both 

 ends, petioled, rather coriaceous; ocreae funnelform, thin, brittle; racemes mostly 

 erect, soon interrupted; calyx red, pedicelled, conspicuously winged in fruit; pedi- 

 cels at maturity rather stout, slightly shorter than the wings, jointed at about the 

 middle; wings broad, suborbicular, with a deep sinus at the base, veiny, reddish; 

 achene 6 mm. long, smooth, shining, its faces concave, its angles margined. N. W. 

 Terr, to Ore. and Wash., South to Mo. and Nev. May-Aug. 



5. Rumex salicifolius Weinm. WHITE, PALE or WILLOW-LEAVED DOCK. 

 (I. F. f. 1303.) Perennial, glabrous, pale green; stem erect, ascending, or sometimes 

 spreading, flexuous, 3-9 dm. high. Leaves lanceolate, linear-lanceolate or the lower 

 oblong, acute or acuminate at both ends, or rarely obtuse at the apex, petioled; 

 racemes erect, divergent or reflexed, dense, in fruit interrupted below, 2 mm. long, 

 pedicelled; pediceh slightly longer than the wings, jointed near the base; wings 

 triangular-ovate, 3 mm. long, undulate or subdentate, each bearing a large ovoid 

 tubercle; achene 2 mm. long, dark red, its faces concave, its angles slightly mar- 

 gined. In swamps, Lab. to S. N. Y., Fla., Neb., Tex. and L. Calif. Also in Europe. 

 May-Sept. 



6. Rumex verticillatus L. SWAMP DOCK. (I. F. f. 1304.) Perennial, gla- 

 brous, rather bright green; stem erect, ascending or decumbent, 6-15 dm. long, 

 more or less flexuous when old. Leaves narrowly oblong, oblong -lanceolate or 

 lanceolate, 5.30 cm. long, narrowed at both ends or obtusish at the apex, slightly 

 papillose, long-petioled; racemes interrupted below, spreading in fruit; calyx 

 green, 2 mm. long ; pedicels stout, thickened above, jointed near the base, 3-5 times 

 as long as the wings, or rarely shorter; wings broadly deltoid, 4 mm. long, more 

 or less decurrent on the pedicel, each bearing a narrowly ovoid tubercle; achene 

 2.5 mm. long, reddish, pointed, its faces concave. In swamps, Quebec to Ont. 

 and Iowa, south to Fla. and Tex. May-July. 



7. Rumex altissimus Wood. TALL or PEACH-LEAVED DOCK. (I. F. f. 

 1305.) Perennial, glabrous, rather pale green; stem erect, simple or sparingly 

 branched above, 3-12 dm. tall. Leaves lanceolate, oblong-lanceolate or ovate- 

 lanceolate (sometimes oblanceolate), 5-25 cm. long, acute at both ends, papillose; 

 panicle rather open; racemes slightly interrupted in fruit; flowers densely 

 whorled, 2 mm. long; pedicels slender, jointed near the base, as long as the wings; 

 wings triangular-cordate, 4-5 mm. long, usually one of them only bearing an ovoid 

 tubercle; achene 3 mm. long, dark red, its faces concave. Along streams and in 

 swamps, Mass, to Neb., Md. and Tex. April-June.; 



