ORDEII 104. POLYGONACE^E. 283 



tic, acntish, 1' ; flowers 2 or 3 together, subscssile, reddish ; achenia striate, dull, 

 enclosed ; stamens 5 8. A common weed, 616'. In rich shady soils it arises to 

 0. ertctuni) with larger oval leaves and pediceiliite flowers. 



2 P. ten lie MX. Slender, rigid, erect, with long simple-angular branches ; Ivs. lineai. 



erect ; eheaths bristle-fringed ; flowers solitary ; acheuia shining. Dry. I If. 



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



ing torn sheaths ; Ivs. fleshy, oblong, 1 6"; fls. sessile, at length spicate ; fruit little 

 exported, smooth and shining. Sandy coasts, Mass, to Ga. j If. 



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



oblong,! 2'; flowers greenish, pedicellate; fruit J exserted, olive-green, shining, 

 \\". Sandy shores, It. I. to Mich, and Md. 2 3f. 



& P. hirsutnm Walt. Densely hirsute with spreading tasvny hairs, erect: Ivs. lan- 

 ceolate ; sheaths fringed ; flowers white, in 2 or 3 slender spike*. @ 8. 2 3f. 



6 P. hydroplperoides MX. Mild Water-pepper. Stem smooth, slender, sheath* 



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

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

 p. ne arfa the leaves and stem above are more or less hispid. V. Wet. 1 3f. 



7 P. acre H. B. K. Wafer Sniartweed. 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 5f. 



8 P. TINCTORIUM. Madder. Lvs. oval ; spikes oblong, dense, roseate. China. 1 2f. 



9 P. Hydropiper L. Water Pepper. Glabrous; sheaths bristly-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. Carey! 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. 447.) 



IIP. Persic, ria 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. Pennsylvdnlcum 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. 



0. dtn*ifiorum. Smooth; racemes slender ; achenia truly lens-shaped. South 



13 P. Incarnatum Ell. Smoothish; leaves lanceolate; branches and peel, glaudn 

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

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



1 4 P. amphiblnm L. Stem prostrate and rooting below, ascending; leaves thick, 



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



cleft. Pools and swamps. 3 4f. Spike 1' or more. 



0. terrentre. Plant more or less hirsute ; spikes elongated. 

 1 5 P. viviparuiii L. Low, simple, erect from a creeping rhizome; leaves lance 



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

 1 6 P. orlentale L. Prince's Feather. Tall, erect, branched ; leaves large, with 



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



Fields and gardens. 3 Sf. 

 I 7 P. Viriiliiijiiiimi L. Stem simple; leaves lance-ovate, acuminate ; flowers re 



mote, 1 from each sheath, in a slender raceme, greenish. TJ. Shades. 3 4f. 



18 P. convolvulus L. Knot Bindweed. Prostrate or climbing, roughish , sheatho 

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

 cemes ; fruit exserted, dull, blackish. Fields. 2 4f. 



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

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



20 P. dumtoruin I- ffedf/e Jiiiidu'eed. Climbing hi<>;h ; ioints not oiliale ; leaves 



