POLYGONACEAE (BUCKWHEAT FAMILY) 



355 



Fruiting calyx x 1. 



6-9 



K. Patientia, 

 Fruiting calyx x 1. 



§ 1. LAPATHUM [Tourn.] DC. (Dock.) Flowers perfect or munoeeiously 

 polygamous ; herbage not sour or scarcely so. (^Flowering through the 

 summer.') 



1. R. venbsus Pursh. Stems from running 

 rootstooks, erect (2-6 dm. high or less), with 

 conspicuous dilated stipules ; leaves on short 

 .but rather slender petioles, ovate or oblong 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. Fig. 691. 



2. R. Patientia L. (Patience D.) Avery 

 tall species, green and glabrous or nearly so, with 

 ovate-oblong and lanceolate 

 leaves (broadest above the 

 base), those from the i^oot 



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

 one of the heart-shaped nearly or quite entire valves 

 (B 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.) Pig. 692. Var. ktSk- 

 Bicus Boiss. Grain conspicuous, 2-3 mm. long. — Mich, to 

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



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

 large, flatfish; pedicels obscurely jointed ; valves broadly ovate 

 or orbicular, somewhat obtusely pointed, often denticulate, 

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

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

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



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

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

 acute at both ends, transversely veint>d, and 

 with obscurely erose-crenulate margins (the lowest, including 

 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, entire or repand-denticulate, all 

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

 and Kan. Fig. 694. 



5. R. CRfspus 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 .ioints ; valves round-heart- 

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

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

 to ellipsoid, with rounded ends. — In culiivated and waste 

 ground, very common. (Nat. from Eu.) Fig. 695. 



6. R. elongXtdb Guas. Resembling B. 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 D.) Depressed or ascend- 

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

 the lowest oblong ; the lowest branches of the dense panicle 

 spreading at nearly right angles; pedicels much shorter tliiin 

 the whitish-brown fruiting calyx; valves deltoid-ovate, 3-4 



Tall and stout 



693. G. oocldentalls. 

 Fruiting calyx X 1. 



E. Britannica. 

 Fruiting calyx x 1. 



E. crispua. 

 Leaf X %. 

 Fruiting calyx x I'/j. 



