POLYGON ACE AE ^BUCKWHEAT FAMILY) 



857 



701. R. pulcher. 

 A bit of infloi-es 



ceiice X 1. 

 Fruiting calyx x 2 



Ont. to 111.. 



K. p«i. 



-joiiles. 



702. 



bicarx: 



Fruitlnj,' 



calvx X V5. 



Fruiting calyx x : 

 the lowermost. 



13. R. PULCHER L. Leaves oblong, frequently constricted 



above the base, mostly acute ; valves ovale, iiuiiiy-t(joilH'd 

 sooii coriaceous, very slronyly reticulated. — Bnlliiiii -rounds' 

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



U. R. persicarioides L. ((jIolden D.) Mi- 

 nutely pubescent, dillusely branched, 2-0 dm. high ; 

 leaves lance-linear, wavy-marghied, the lower 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 lo)ig awn-like bristles on each side, and a large 

 grain on the back. (E. maritimus ALan. ed. 6, not 

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

 and westw. Fig. 702. 



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

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

 leaves arrow- or halberd-shaped; smooth perennials^ 

 spreading by running rootstocks, flowering in spring. 



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

 3-9 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. hastatulus 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. R. AcKTOSELLA L. (FiEi.u or Sheep 

 S.) Low (1-3 dm, high) ; leaves narrow- 

 lanceolate or linear, halberd-form, at least 



the narrow lobes entire, widely spreading ; 

 pedicels jointed at the summit; sepals 

 scarcely enlarged in fruit, exceeded by the naked achene. 

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



704. R. hastatulus. 

 Leaf X Va- 

 Fruiting calyces x 2. 



705. E. Acetosella. 

 Leaf X 1. 

 Fruiting calyx X 2. 



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 cm the 

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

 the cotyledons slender. Pedicels jointed. — Ours all herbaceous, w'th librous 

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

 autumn. (Name composed of iroXv-, many, and ybw, knee, fn^n the numerous 

 joints.) 



§ 1. AVICULArIA Meisn. Flowers in axillanj fascicles or spicate tcith foUa- 

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

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

 calyx [)-(5-parted, usually more or less herbaceous ; stainens 3-8, the 3 inr tr 



