POLYGON AOB A E (BUCKWHEAT FAMILY) 



357 



13. R. puLCHER L. Leaves oMong, frequently constricted 

 above the base, mostly auute ; valves ovale, many-toothed, 

 soon coriaceous, very strongly reticulated. — Ballast grounds, 

 etc. , Va. to La. ; Cal. (Adv. from Eu.) Fig. 70L 



14. R. persicarioides L. (Golden D.) Mi- 

 nutely pubescent, diffusely branched, 2-6 dm. high ; 

 leaves lance-linear, wavy-margined, the lovfer au- 

 ricled or heart-shaped at base ; whorls excessively 

 crowded in leafy and compact or interrupted spikes ; 

 valves rhombic-oblong, lance-pointed, each bearing 

 2-3 long awn-like bristles on each side, and a large 

 grain on the back. (iJ. maritimus Man. ed. 6, not 

 L.) — Sea-shore, Que. to N. C. ; also in brackish or saline places, 



to 111., and westw. Fig. 702. 



tOl. E. pulcher. 

 A bit of inflores- 

 cence X ]. 

 Fruiting calyx x 2. 



Gilt. 



702. 'E. per- 



Bicarioides. 



Fruiting 



calyx X 2. 



703. li. Acetosa. 

 Leaf X Va. 

 Fruiting calyx x 2. 



§ 2. ACET6sA [Tourn.] DC. (Sorrel.) Flowers dioecious, 

 small, in a terminal naked panicle ; herbage sour; somt 

 leaves arrow- or halberd-shaped; smooth perennials, 

 spreading by running rootstocks, flowering in spring. 



15. R. Acet6sa L. (Garden S.) Erect, 

 .^-9 dm. high ; leaves oblong or broadly 

 lanceolate, arrow-shaped ; valves rounded at 

 the apex, 4 mm. broad. — Lab. to Pa., and 

 westw. ; frequent near Quebec, compara- 

 tively local southw. (Nat. from Eu.) Fig. 

 703. 



16. R. hastdtulus Baldw. Stem simple, 

 3-6 dm. high ; leaves linear or lanceolate, 

 some of them hastate with divaricate, basal 

 lobes ; valves ovate, 2.5 mm. broad. — Sandy 

 soil, near the coast, e. Mass. to Fla. and 

 Tex. ; inland in Miss, basin to 111., Mo., and 

 Kan. Fig. 704. 



17. H. AcETOSELLA L. (FiELD or Sheep 

 S.) Low (1-3 dm. high); leaves narrow- 704. E. hastatuluB. 

 lanceolate or linear, halberd-form, at least Leaf x %. 



the lowermost, the narrow lobes entire, widely spreading ; Fruiting calyces x 2. 

 pedicels jointed at the summit; sepals 

 scarcely enlarged in fruit, exceeded by the naked achene. 

 — A common weed. (Nat. from Eu.) Fig. 705. 



4. POLYGONUM [Tourn.] L. Knotweed 



Calyx 4-6(mostly 5)-parted ; the divisions often petal- 

 like, all erect in fruit, withering or persistent. Stamens 

 3-9. Styles or stigmas 2 or 3 ; achene accordingly lentic- 

 ular or 3-angular. Embryo placed in a groove on the 

 outside of the albumen and curved halfway around it ; the radicle and usually 

 the cotyledons slender. Pedicels jointed. — Ours all herbaceous, W'th fibrous 

 roots (except in P. viviparum), flowering through late summer and early 

 autumn. (Name composed of iroXi)-, many, and ybm, knee, from the numerous 

 joints.) 



§ 1. AVICULArIA Meisn. Flowers in axillary fascicles or spicate -with folia- 

 ceous bracts ; leaves and bracts jointed upon a very short petiole adnate to 

 the short sheath of the 2-lobed or lacerate scarious stipules; stems striate ; 

 calyx h-Q-parted, usually more or less herbaceous ; stamens .3-8, the 3 inner 



705. B> Acetosella. 

 Leaf X t. 

 Fruiting calyx X 2. 



