OKDKK 104. POLYGONACE.E. 283 



tic, acutish, 1' ; flowers 2 or 3 together, suhsessile, reddish ; achenia striate, dull, 

 enclosed ; stamens 5 8. @ A common weed, 6 16'. In rich shady soils it arises to 

 )8. erection^ with larger oval leaves and pedice^ate flowers. 



2 P. tenue Ms. Slender, rigid, erect, with long simple-angular branches ; Ivs. lineai, 



erect ; eheaths bristle-fringed ; flowers solitary ; achenia shining. Dry. ^ If. 



3 P. maritimum L. Prostrate, diffuse, glaucous, with very short joints and swell- 



ing torn sheaths ; Ivs. fleshy, oblong, 16" ; fls. sessile, at length spicate ; fruit little 

 exserted, smooth and shining. Sandy coasts, Mass, to Ga. If. 



4 P. ramosissimum MX. Erect or ascending, much branched, striate ; Ivs. linear 



oblong, 12' ; flowers greenish, pedicellate ; fruit | exserted, olive-green, shining, 

 If. Sandy shores, R. I. to Mich, and Md. 2 3f. 



5 P. lilrsutum Walt. Densely hirsute with spreading tawny hairs, erect; Ivs. lan- 



ceolate ; sheaths fringed ; flowers white, in 2 or 3 slender spikes. (2) S. 2 3f. 

 tt P. hydro piperoides MX. Mild Water-pepper. Stem smooth, slender, sheath8 

 long, close, fringed and hispid ; Ivs. linear-lanceolate, not acrid ; spikes erect, slen- 

 der, loose at base ; calyx glandless , achenia shining. 

 /3. set area the leaves and stem above are more or less hispid, if: Wet. 1 3f. 



7 P. acre H. B. K. Water Smartweed. Glabrous, virgate, slender ; sheath loose, 



bristle-fringed; Ivs. lanceolate, acrid ; spikes filiform, erect; flowers reddish-green, 

 dotted like the leaves ; fruit shining. Wet places. S. and W. 2 of. 



8 P. TINCTORICM. JUadder. Lvs. oval ; spikes oblong, dense, roseate. China. 1 2f. 



9 P. Hydropiper L. Water Pepper. Glabrous ; sheaths brisLly-ciliate ; Ivs. lanceo- 



late, very acrid, finely punctate ; spikes nodding, loose, slender, greenish ; calyx 

 punctate : stamens mostly 6 ; achenia roughened, black. Damp. 1 2f. 



10 P. Careyl Olney. Stem erect, 3 5f, bristly and much branched; leaves lanceo- 

 late, some hispid ; stipules tubular-truncate, ciliate ; spikes dense, purplish, nodding 

 on long hairy peduncles. Swamps, N. Eng. to Penn. (See p. 44T.) 



11 P. Persicaria L. Smart-weed. Glabrous, erect: leaves lanceolate, usually 

 marked with a brown spot ; sheaths fringed ; spikes dense, erect, oblong ; stamens 

 6 ; style 2-cleft ; achenia shining. Waste grounds : common. 1 2f. 



12 P. Pennsylvanicum L. Branches above and pedicels glandular-hispid ; leaves 

 lanceolate ; spikes erect, oblong, crowded, rose-colored, showy ; achenia lens-shaped, 

 with flat sides. Margins of waters. 2 4f. 



p. tlenxilloruni. Smooth; racemes slender ; achenia truly lens-shaped. South. 



1 3 P. incarnatum Ell. Sinoothish ; leaves lanceolate ; branches and ped. glandu- 

 lar-dotted; spikes linear, nodding, becoming long; achenia lens-shaped, with con- 

 cave sides. Ditches and pools, W. and S. 2 3f. 



14 P. amphibium L. Stem prostrate and rooting below, ascending; leaves thick, 

 smooth, lance-oblong, variable ; spikes oblong, ovoid or dense ; stamens 5 ; style 2- 

 cleft. Pools and swamps. 3 4f. Spike V or more. 



ft. terrtstre. Plant more or less hirsute ; spikes elongated. 



15 P. viviparum L. Low, simple, erect from a creeping rhizome; leaves lance 

 linear, with rolled edges ; spike 1, linear. TI White Mountains, and N. 



16 P. orientale L. Pi-inctCs Feather. Tall, erect, branched; leaves large, with 

 hairy salver-form sheaths; stamens 7; styles 2 ; spikes large, red, nodding, showy. 

 Fields and gardens. 3 8f. 



1 7 p. Virginianum L. Stem simple ; leaves lance-ovate, acujninat* 1 flowers re- 

 mote, 1 from each sheath, in a slender raceme, greenish, if. Shades. " 4f. 



IS P. convolvulus L. Knot Bindweed. Prostrate or climbing, roughish, sheaths 

 naked; leaves hastate, pointed; flowers in axillary fascicles or in interrupted ra- 

 cemes ; fruit exserted, dull, blackish. Fields. 2 if. 



19 P. clllnode MX. Climbing; sheaths ciliate at base; leaves deeply cordate, 

 pointed ; racemes paniculate, loose ; achenia shining. Hedges. 3 Sf. 



20 P. dumetorum L. Hedge Bindweed. Climbing high ; joints not ciliate : :Tave 



