POLYGON ACE AE (BUCKWHEAT FAMILY) 



355 



§ 1. lAPATHUM [Tourn.] DC. (Dock.) Flowers perfect or monoeciously 



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



summer.) 



ft 1. R. venbsus Pursh. Sttms from running 



^»=^ >.^^_^^____^ rootstocks, 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 m fruit ; valves entire, vnthout 



grains, 

 — Sask. 



691. R. venosus. 

 Fruitin"- calvx x 1. 



61*2. E. Patientia. 

 Fruiting cal3-x x 1. 



Tall and stout 



693. E. occidentalis. 

 Fruitingr calvx x 1. 



cordate with a deep si)ius, rose-color, 

 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 root 

 6-9 dm. long and 1-1.5 dm. broad ; pedicels icith 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 conspicuous, 2-3 mm. long. — Mich, to 

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



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

 large, flattish ; pedicels obscurely jointed ; valves broadly ovate 

 or orbicular, somewhat obtusely pointed, often denticulate, 

 6-9 mm. broad, all naked or one of them graiii-bearing. — Rich 

 (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, including 

 the petiole, 3^ 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. crispus L. (Yellow D.) Smooth, 0.9-1.6 m. 

 high ; leaves loith strongly vxivy-curled margins, lanceolate, 

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

 whorls crowded in pi'olonged v:and-like racemes, leafless 

 above; pedicels with tumid joints; 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 cultivated and waste 

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



6. R. eloxgatus Guss. Resembling B. crispus, and per- 

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

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



7. R. pallidus Bigel. f White D.) Depressed or ascend- 

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



69.5. E. crispus. the lowest obloug ; the lowest braiiches of the dense panicle 

 Leaf xVg. spreading at nearly right angles; pedicels much shorter than 



Fruiting calyx X iVs- tlie loMtish-brown fruiting calyx; valves deltoid-ovate, 3-4 



694. E. IJritanniea. 

 Fruiting calyx x 1. 



