362 FLORA. 



parted to near the base; achene lenticular and biconvex, or 3 -angled, more or less 

 gibbous, 2 mm. long, ovoid or broadly oblong, short- pointed, black, minutely 

 granular, but shining. Neb. to Mex. ; widely distributed in tropical Am. June- 

 Sept. 



12. Polygonum Careyi Olney. Carey's Persicaria. (I. F. f. 1329.) 

 Annual, rough-glandular throughout ; stem erect, 3-9 dm. tall. Leaves oblong. 

 Lanceolate or linear-lanceolate, the uppermost nearly linear, 5-27 cm. long, short- 

 petioled or nearly sessile, acuminate at both ends, hispid on the midrib, ciliate, 

 sparingly punctate; ocreae cylindric, sparsely hispid, fringed with long bristles; 

 racemes several, narrow, loosely flowered, drooping, 2-7 cm. long; calyx purplish; 

 stamens 5 or sometimes 8; style 2-parted to below the middle; achene lenticular, 

 bro&dly ovoid or obovoid, 2.5-3 cm. long, short-pointed, thick, smooth and shining. 

 In marshes, Me. and Out. to Mich., south to R. I., N. J. and Penn. July-Sept. 



13. Polygonum setaceum Baldw. Bristly Persicaria. (I. F. f. 1330.) 

 Perennial, strigose; stem 6-12 dm. high, erect, simple or sparingly branched; 

 leaves lanceolate or oblong-lanceolate, 5-23 cm. long, acuminate at both ends, 

 ciliate, inconspicuously punctate; ocreae cylindric, strigose, fringed with very long 

 bristles ; racemes few, terminal, 2.5-6.5 cm. long, erect, narrow, sometimes 

 geminate, rather loosely flowered; calyx white or pink; stamens 8; style 3-parted 

 to below the middle; achene 3-angled, oblong or obovoid. thick-pointed, 1-2 mm. 

 long, minutely reticulated and rather dull, or smooth and shining. In swamps, 

 southern Mo. to La., east to N. Car. and Fla. June-Sept. 



14. Polygonum Opelousanum Riddell. Opelousas Persicaria. (I. F. f. 

 1 33 1.) Perennial, glabrous or nearly so; stem slender, erect or ascending, spar- 

 ingly or considerably branched, 3-9 dm. tall, becoming woody below. Leaves 

 linear or linear-lanceolate, 4-13 cm. long, ciliate; ocreae cylindric, strigose, fringed 

 with long bristles; spike-like racemes panicled, erect, often geminate, 1. 2-5 cm. long, 

 not densely flowered; calyx white, 5-parted to below the middle; stamens 8 or fewer; 

 style deeply 3-parted ; achene 3-angled or rarely 4-angled, broadly ovoid or 

 obovoid, 1.5 mm. long, black, smooth and shining. Mo. to La., Tex. and Mex. 

 July-Sept. 



15. Polygonum hydropiperoides Michx. Mild Water Pepper. (I. F. f. 

 1332.) Perennial, strigillose; stem erect, decumbent or prostrate, slender, 3-9 dm. 

 long. Leaves narrowly lanceolate or oblong-lanceolate, varying to linear-lanceolate, 

 5-15 cm. long, short petioled, acute at apex, ciliate, pubescent with appressed 

 hairs on the midrib beneath; ocreae cylindric, loose, strigose, fringed with long 

 bristles; racemes panicled, terminal, erect, narrow, more or less interrupted, 3-7.5 

 cm. long; calyx pink or greenish; stamens 8; style 3-parted to below the middle; 

 achene 3-angled, ovoid or oblong, 2-2.5 mm - l° n g> smooth, shining. In swamps 

 and wet soil, N. B. to Minn, and Calif., south to Fla. and Mex. June-Sept. 



Polygonum hydropiperoides Macouni Small. More robust than the type; stem 

 3-12 dm. long:, clothed with stout appressed hairs ; leaves lanceolate, obtuse ; ocreolae 

 more or less ciliate ; calyx white or whitish, often conspicuous. Quebec to W. Va. and 

 Ind. Also in Calif. 



16. Polygonum Hydropiper L. Smart- weed. Water Pepper. (I. F. f. 

 1333.) Annual, glabrous, stem erect, often red or reddish, 2-6 dm. tall. Leaves 

 lanceolate or oblong-lanceolate; 2.5-8 cm. long, short-petioled, acute or acuminate 

 at the apex, undulate or slightly crisped, punctate, ciliate, very acrid; ocreae cylin- 

 dric, fringed with short bristles, sometimes slightly pubescent, usually swollen at 

 the base by the development of several flowers within; racemes panicled, 2.5-7.5 

 cm. long, narrow, drooping, interrupted; calyx green, 3-5-parted (usually 4-parted), 

 conspicuously punctate; stamens 4 or sometimes 6; style short, 2 -3-parted; achene 

 lenticular or 3-angled, broadly oblong or ovoid, slightly gibbous, 2.5-3 mm - long, 

 granular, dull. In moist waste places, almost throughout N. Am. Naturalized 

 from Europe in our area, perhaps indigenous in the far Northwest. July-Sept. 



17. Polygouum punctatum Ell. Dotted or Water Smart-weed. (I. F. f. 

 1334.) Annual or perennial, glabrous or very nearly so; stem erect or ascending, 

 rarely prostrate, simple or branched, 3-12 dm. long. Leaves lanceolate or obi on g- 

 lanceolate, 3-20 cm. long, acuminate at both ends, petioled, ciliate conspicuously 

 punctate, acrid, the midrib often with a few scattered hairs; ocreae cylindric, 



