POLYGONUM. 



145 



rfed, branching near the summit; radical 

 feaves spatulate, obtuse, dauline one? lance 

 elate, small ; Howers capitate, heads squar- 

 rose, corymbed ; calycine wings .setaceous, 

 acuminate. 2 3 f. S. 



boi/kiii'ia, (ia^-w.) flowers cri late ; stem 

 simple; leaves 4-5 verticillate. Dlilong-oval, 

 lanceolate or acute ; upper om- .scattered; 

 spike solitai-y, long-peduncled, lu.K-tlowered. 

 S. 



cymo'sa, (J. Au. y.) cyme simple ; spike- 

 lets ovate ; winsra elliptical-oblong-, rather 

 obtuse, mncronate ; superior sepal half as 

 large as the wings, rather obtuse ; lateral 

 petals distinct nearly to the ba.se ; crest 

 minute ; seed sub-globose, glabrous ; stem 

 simple, terete, attenuated upward ; radical 

 leaves linear-spatulate, cauliue ones linear- 

 subulate, minute. 2-5 f. 

 POL"YGO'NUM. 8—3. (Polygonece.) [From 

 polus, many, a.ud gone, a joint, on account of 

 the many joints in its stem.] 



1. Floirers axillary, 

 avicnla're, (knot-grass, w. M. 2^.) leaves 

 lanceolate, scabrous at the margin ; stipules 

 short, laciniate ; stem procumbent ; flowers 

 Bub ses.sile, axillary, minute. 6-12 i. 



f(igop"yrum. (buckwheat r-w. Ju. ^.) 

 racemes panicled ; leaves heart-sagittate ; 

 stem erectish, unarmed; angles of the seeds 

 equal. 1-2 f. Ex. 



orien'tnle, (prince's feather, r. An. %) 

 stem erect; leaves very large, petioled, 

 ovate, acuminate, minutely pubescent ; stip- 

 ules hairy, somewhat sabre form; flowers 

 in crowded, terminal spikes. 4-5 f. Old 

 fields and road-sides. Flowers in large, 

 pendulous, crimson spikes. Naturalized. 



erec"tiim, (w. J. 2^.) stem branched ; 

 leaves broad, oval, petiolate ; flowers pen- 

 tandrous. 1-3 f. 



mariti'mum, (w-r. Au. ^ .) stamens 8 ; 

 leaves lanceolate, thick and glaucous, mar- 

 gin revolute ; stipules lacerate ; stem dif- 

 fuse, prostrate, suffruticose. 1-2 f. S. 



teii"ne, (w. Ju. 0.) stem erect, slender, 

 branched, acute-angled ; leaves long-linear, 

 Btrai,'ht, acuminate ; stipules tubular ; apex 

 villose; flowers alternate, sub-solitary. 

 9-18 i. 



2. Flowers in slender spikes, 

 lapathifo'lium, (r. \v. Au. 0.) stipules 

 awnless ; stamens 6 ; styles 2 ; peduncles 

 scabrous ; spikes numerous, rather crowd- 

 ed ; leaves lance-ovate, short-petioled, pu- 

 bescent above. 2-4 f. 



puncta'tum, fwater-pepper, w. Au. 0.) 

 flowers octandrous, glandular; styles 3; 

 stipules ciliate, spotted; leaves lanceolate, 

 glabrous: spike filiform, at first cemuous; 

 bracts remotfly alternate. 12 f 



mi'te, (tasttjless knotweed, J. ^.) flowers 

 octandrous, in crowded spikes ; styles 3 ; 

 leaves naiTOw-lanceolate, sub-hirsute ; stip- 

 ules hirsjte, long-ciliate ; bracts ciliate, sub- 

 imbricate. 12-18 i. 



virgima'num, (w. Ju. 11.) stamens 5; 

 Btyles 2. unecjual ; utem simple, angular ; 

 leaves broad-oval ; spikes virgate ; flowers 

 remote. 2-4 f 



histartoi'dcs, (w-r. J. 2X-) bi-acts 1 flow- 



ered, 2-3 valved ; leaves oval, flat, petioled; 



stem simple, 1 -spiked. 



3. Flowers in thick crowded spikes. 



vivipa'rum, (r. Au. Z/.) stem simple; 

 spike linear, solitary; leaves lance-linear, 

 margins revolute ; bracts ovate, acuminate. 

 6 i. 



barba'tum, (r. w. Ju.) stamens 6 ; styles 

 3 ; spike virgate, truncate ; bristle ciliate ; 

 leaves oblong, acute, smoothish. 18-24 i. 



persica'ria, (r. Ju. ^.) stamens 6 ; styles 

 2 ; spikes ovate oblong, erect ; peduncles 

 smooth ; leaves lanceolate ; stipules smooth- 

 ish, ciUate. 1-2 f. 



pennsylva'nicum, (Ju. 0.) flowers octan- 

 drous; spikes oblong; leaves lanceolate; 

 stipules smooth and naked; stem genicu- 

 late. 2-4 f. 



amphib"ium, (mud knotweed, Ju. r. If.) 

 leaves petiolate, oblong-lanceolate, some- 

 times cordate at base ; flowers in dense, ter- 

 minal spike-s, pentandrous; styles bifid; 

 stem nearly erect. Var. terres"tre, leaves 

 smooth above, slightly pubescent beneath , 

 spike ovate, oblong. Var. aqxinVicum 

 leaves floating, ovate-lanceolate ; spike cy- 

 lindric-oblong. 



4. Flowers in spiked panicled racemes. 



articnla'ium, (joint weed, r. Ju. 0.) 

 leaves linear, obtuse ; flowers octandrous , 

 styles 3 ; spikes paniculate, filiform, erect ; 

 pedicels solitary, articulate near the base. 

 Sandy plains. 



5. Flotcers sub-racemed ; leaves cordate, 

 sagittate, or hastate. 



sagitta'tum, (w. J. 0.) stem prostrate, 

 square ; the angles awned with reversed 

 prickles; leaves sagittate; flowers octan- 

 drous, in small peduncled heads. Wet 

 grounds. 



arifo'lium, (r-w. Ju. ^.) stem prostrate, 

 square, the angles witli reversed prickles; 

 leaves loug-petioled, hastate ; spikes few- 

 flowered ; flowers hexandrous ; styles 2 or 

 1. 2 4 f. ^ 



convoV'vnlus, (w. r. Ju. 0.) stamens 8 ; 

 styles 3 ; leaves petioled, oblong, hastate- 

 cordate ; ^m long, twining ; segments of 

 the perianth bluntly keeled. 



scan" dens, (climbing buckwheat, ^v. r. 

 Au. 2^.) stamens 8 ; styles 3 ; leaves broad- 

 cordate ; stipules truncate, naked ; stem 

 twining, glabrous ; calyx bearing the fruit 

 3-winged. 



cilino'de, (Ju. 0.) stamens 8 ; styles 3 , 

 leaves cordate ; stipules sub-acute, sui 

 rounded at the base with an outer ciliate 

 series ; stem angled, prostrate or climbing ; 

 divisions of the calyx obtusely keeled, 



hirsu'tnm, (w. Ju. 0.) stamens 7 ; styles 

 3-cleft ; spikes filiform; stem and stipules 

 very hirsute ; leaves lanceolate, hirsute, 

 punctate. 2 f. ^. 



fimbria' turn, (w. Au.) spikes panicled, 

 flowers solitary, fimbriate; stipule truncate, 

 fringed ; leaves Imear, acute at each eud 

 2 f. 6\ 



scta'ceum, (w. Ju.) flowers octandrous; 

 styles "Jclffl; peduncles long, 2-spiked ; 

 spikes interrupted, hirsute ; leaves bn^od 



