«08 Order 102.— rOLYGONACEJB. 



y. erectum. Stems ascending or erect; lvs. larger, elliptic or oval, peliolate; 

 (Is. pedicellate; stam. mostly 5. — In richer or shady soil-, more common 

 westward. (P. eroctum L.) 



2 P. temie Mx. St. slender, rigid, erect, with long, simple branches, acute-angled; 

 lis. linear-lanceolate and linear, erect, acute; sheaths (stipules) bristly- 1 ringed at 

 top; lis. alternate, subsolitary; ach. included. — A small, slender plant, on rocky 

 Boils, N. Eng. to the Mts. of (Ja. and Wi3. St. G' to If high. Lvs. 1 to 1}' long, 

 1 to 2" wide, 3-veined, sessile. Pis. white?. JX, Aug. 



3 P. roaritimtim L. Prostrate, diffusely branched, glau:ou,s ; st. striate, with 

 very short intemodes ; sheaths gibbous at base, hyaline, torn; lvs. fleshy, oval or 

 linear-oblong, nearly veinless; fls. sessile; ach. sharply angled, a Mtio txserted, 

 smooth and shining. — U Sandy shores, R. I. to S. Car. Sts. 6 to 12' long. Lvs. 

 few an 1 small, 2 to 4" long. Pis. often crowded i:i leafy racemes, rose-purple, 

 green at base, 1" bug. (P. aviculare, p. glaucum, 2d edit.) 



4 P. ramossissimum Mx. St. tall, erect or ascending, much branched, striate ; 

 sheaths G- veined, at length torn ; lvs. lance-oblong or linear, pc-tiolate ; fls. subsoli- 

 tary, pedicellate, greenish ; ach. included, smooth but dull. — r l: Sandy shores of 

 streams and lakes, Mich, to 111. Much like P. aviculare, but rigidly erect, 2 to 3f, 

 with larger, petiolata lvs. 2' long, and larger sepals, 1-}" long in fruit, gnicn, with 

 narrow white borders. 



5 P. lursutum Walt. Hairy Kxot-grass. Hirsute, with long, spreading, tawny 

 hairs; sheaths ciliato; lvs. lanceolate, obtuse at base, gradually narrowed to tho 

 point; spikes 2 or 3, very slender; bract equaling its 2 or 3 pedicels; stamens 7 

 to 8 ; style 3-clcft; ach. shining. — £, Swamps, N. Car. to Fla. St. slender, root- 

 ing at base, ascending 2 to 4f. Lvs. 2 to 3' by 4 to 10", mostly smooth abovo, 

 sometimes dense-hairy liko tho stem. Pis. white. May — Aug. 



6 P. bydropiperoides Mx. Mild "Water-pepper. St. smooth; sheaths hairy, 

 bristly -ciliato, long and narrow; lvs. linear-lanceolate, tapering to each end, 

 slightly appressed-hairy (not acrid) ; spikes 2 or more, slender, loose-flowered at 

 base; cat. glandless; stam. 8; style half-3-cleft; ach. shining. — % Ditches and 

 wet ground, common. St. branched, 1 to 3f high. Lvs. narrowed into a short 

 petiole, not acrid. Pis. rather large, whito-roscate, rather close, 4cr 5 lrom each 

 bract. Aug., Sept. (P. mite Pers.) 



/3. SSTACECM. Lvs. lanceolate; stip. conspicuously fringed with long bristles. 

 — In clayey coils, southward. (P. setaceum Baldw.) 



7 P. acre II. B. K. St. ascending, slender, glabrous; sheath smoothish, fringod 

 with bristles, bearing tho leaf near the base; lvs. acrid, lanceolate, acuminate, 

 fui/orrn, interrupted at base ; bracts truncate, 1 to 3-flowered ; ped. scarcely er- 

 serted; stam. 8; stylo 3-parted; ach. 3-cornered. — Wet places, ditches, com- 

 mon S. and W. Cal. greenish at base, llesh -colored, brown-dotted like tho lvs. 

 Ach. shining. JL — Sept. (P. punctatum Ell. P. hyaropiperoide3 Ph.) 



8 P. Hydropiper L. Water-pepper. Glabrous; sheaths bristly-ciliato ; lvs. 

 lanceolate, tapering to both ends, minutely, piUucid-punctate {very acrid); spikes 

 loose-flowered, blender, short (2 to 5') nodding; ped. exserted; eal. glandular- 

 punctate; stam. mostly G; sly. 2 or 3-cleft; ach. flattish (rarely obtusely triangu- 

 lar), dull, minutely roughened. — CD Damp waste grounds, ditches, &c, 1 to 2f high. 

 Lvs. not more than G" wide. Pis. green and rose-colored. Ach. black. Jl. — 

 Sept. g Eur. 



9 P. Careyi Olney. St. erect, hirsute, much branched; lvs. lanceolate, with scat- 

 tered and oppressed hairs; stip. scarious, tubular, truncate, hairy-cihate; spike3 

 axillary and terminal, on very long, nodding peduncles thickly beset with glandular 

 hairs; stam. 6 to 8 included; sty. 2 ; ach. orbicular-ovate, mucronatc, tumid, 

 shining. — CD Swamps, N. Eng. and N. Y.? Plant 3 to 5f high. Lvs. 3 to 6' by 

 G" to 1', midvein and margins hairy. Cab greenish-purple, tiuged with white, 

 minutely dotted. 



10 P. Persicaria L. St. erect ; lvs. lanceolate, tho upper surface usually marked 

 wi'Jt, a brownish spot; stip. fringed; spilces dense, oblong, erect; ped. smooth ; stam. 

 G ; sty. 2, half united ; ach. shining, flattened. — CD A common s pecies about 

 buildings, fences, wet grounds, &c Hit. smooth, branched, leafy, 1 to 2f high, 



