POLYGONACEAB (BUCKWHEAT FAMILY) 



855 



summer.) 



K. venosus. 

 Fruiting calyx x 1. 



C>»2. i:. Putientia. 

 Fruiting calyx x 1. 



§1. LApATHUM [Tourn.] DO. (Dock.) Flowers perfect or monoeciously 

 ^^!li?lT^^^' ^^^^^^^ ^^^ ^^^^ ^^ ^^arcely so. {Flowcrimj through the 



1. R. venbsus Pursli. Stems from running 

 rootstocks, eruct (2-6 dm. high or less), with 

 conspicuous dilated stipules; leaves on short 

 but rather slender petioles, ovate or ol)long to 

 lanceolate, acute or acuminate, only the low- 

 est obtuse at base ; panicle nearly sessile, short, 

 dense in fruit ; valves entire, without grains, 

 cordate with a deep sinus, rose-color. — Sask, 

 to centr. Mo., and westw, Fjg. 691. 



2. R. Patientia L. (Patience D.) A very 

 tall species, green and glabrous or nearly so, with 

 ovate-oblong and lanceolate 

 leaves (broadest above the 

 base), those from the root 



6-9 dm. long and 1-1.5 dm. broad ; pedicels with tumid 

 joints; one of the heart-shaped nearly or quite entire valves 

 (6 mm. broad) usually bearing a very small grain, or its 

 midrib merely thickened at base. — Rich open soil, Nfd. to 

 N. Y. and Pa. (Nat. from Eurasia.) Fig. 692. Var. kur- 

 Dicus Boiss. Grain conspicrious, 2-3 mm. long. — Mich, to 

 Mo., and westw. (Nat. from Eurasia.) 



3. R. occidentalis Wats. Smooth, stout, erect, usually purple-tinged ; leaves 

 large, flattish; pedicels obscurely jointed ; valves broadly ovate 

 or orbicular, somewhat obtusely pointed, often denticulaie, 

 6-9mm. broad, all naked or one of them grain-bearing. — Hich 

 (often brackish) soil. Lab. to Alaska, s. to e. Me., Minn., N. 

 Dak., Col, and Cal. Fig. 693. 



4. R. Britannica L. (Great Water D.) 

 (1-2 m. high); leaves oblong-lanceolate, rather 

 acute at both ends, transversely veined, and 

 with obscurely erose-crenulate margins (the lowest, mcluding 

 the petiole, 3-6 dm. long, the middle rarely truncate or ob- 

 scurely cordate at base) ; racemes upright in a large com- 

 pound panicle, nearly leafless ; whorls 

 crowded ; pedicels obscurely jointed ; valves 

 orbicular or round-ovate, very obtuse, ob- 

 scurely heart-shaped at base, finely reticu- 

 lated, eiitire or repand-denticulate, all 

 grain-bearing o — Wet places, Nfd. to N. J., w. to Ont., Minn., 

 and Kan. Fig. 694. 



5. R. crispus L. (Yellow D.) Smooth, 0.9-1.6 m. 

 high ; leaves with strongly wavy-curled margins, lanceolate, 

 acute, the lower truncate or scarcely heart-shaped at base ; 

 whorls crowded in prolonged wand-like racemes, leafless 

 above; pedicels with tumid joints; valves round-heart- 

 shaped, obscurely denticiilate or entire, 4-6 mm. broad, 

 mostly all grain-bearing; the grains very plump, subglobose 

 to ellipsoid, with rounded ends. — \x\ cull ivated and waste 

 ground, very common. (Nat. from Eu.) Fio, 69'). 



6. R. elon'gXtus Guss. Resemblinix R. crispus, and per- 

 haps a variety of it ; grains lance-ovoid, attenuate. — Widely 

 distr., and becoming common. (Nat. from Eu.) 



7. R. pdllidus Bigel. (White!).) Depressed or ascen.l 

 ing ; root white ; leaves glaucous, narrowly lanceolate, or 



J5. Pv. crispus. the lowest oblong; the lotcest branches of the dense panicle 

 Leafxys* " spreading at nearly right angles; pedicels much shorur tlian 



Fruiting calyx X 1V«. the wMtish-brown fruiting calyx; valves deltoid-ovat«, 3-4 



Tall and stout 



693. E. occidentalis. 

 Fruiting calvx x 1. 



K. liritannica. 

 Fruitiig calyx x 1. 



