* Diecious: valves without dorsal callosity, not reticulated, not larger than the achene: 
foliage acid, 
1. R. Acetosella L. From low to 5 or 6 dm. high, tufted: leaves rarely 5 em. 
oN 
long, oblanceolate, acute, the lower mostly hastate with large decurrent rarely 1- 
toothed auricles, the upper gradually reduced and entire: panicle more or less com- 
a oS « 
pound, usually reddish, the filiform ascending branches leatless; pedicels capillary, 
once or twice as long as the flower, articulated at summit: flower about 1.5 mm, long, 
the outer sepals granular: achenes four-fifths as broad as long.—Naturalized every- 
where. Known as “ field-sorrel” or “ sheep-sorrel.” 
** Dicweious: valves rather finely reticulated, becoming round-cordate and much larger 
than the achene: foliage acid: inflorescence with slender leafless branches. 
2, R. hastatulus Baldw. Tufted, 3 to 6dm. high: leaves exceptionally 2.5 by 10 
em., oblong or oblanceolate, obtuse to subacute, some of them hastate with short 
and often spreading auricles: panicle mostly ample and rather open; pedicels capil- 
lary, once or twice as long as the fruit, obscurely articulated below the middle: 
valves about 4 mm. broad, short-clawed, without callosities, the middle sometimes 
papillate: achene 1 by 1.5 mm. CR. Lngelmanni Meisn.)—Sandy bluffs and fields, 
extending from the Atlantic States into Texas. 
** * Hermaphrodite or monacious: valves commonly reticulated, becoming round or elon- 
gated and much larger than the achene: leaves only exceptionally acid, never 
hastate: inflorescence with stouter sometimes leafy branches, 
+ Valves at most rery minutely erose or low-denticulate. 
++ Valves large (15 mm, long), mostly rosy, round or broadly ovate, deeply cordate, with- 
out callosities: whorls rather remote, but overlapping in fruit: outer sepals at 
length refleced: stipular sheaths very large and loose, 
3. R. hymenosepalus Torr. (CANAIGRE).  Subsimple, 3 to 9 dm. high, from a clus- 
ter of tuberous roots, papillate to glabrous, often red: leaves rather succulent, more 
or less wavy margined, often 5 by 20 em or larger, elliptical to oblanceolate, obtuse 
to very sharply acuminate, the acute base decurrent on the short thick petioles: 
inflorescence ample, compound, with elongated subereet branches; pedicels slender, 
abont as long as the fruit, somewhat swollen-jointed below the middle: valves flex- 
ible, ovate, about 10 by 15 mm., obtuse to subacute, with an open sinus: achene 
3 by 5.8 mm.—Dry soil, extending from Texas and Indian Territory westward, 
++ ++ Valves small or medium sized (not over 70 mm. long), only moderately if at all 
cordate. 
= Valves round or very broadly ovate, flexible, low-reticulate: pedicels slender or capillary. 
4. R. occidentalis Watson. Mostly 6 to 9 dm. high, erect or abruptly ascending, 
‘ather stout, subsimple: leaves somewhat tleshy, glibrous, glossy, bluish green, 
wavy margined, the lower very large, ovate or mostly oblong-ovate, truncately cor- 
date, the apex rounded to subacute: panicle strict, dense.and rosy in fruit, naked. 
or with few small leaves below; whorls somewhat remote but overlapping; pedicels 
2to 3 times as long as the fruit, very obscurely and not swollen-jointed below the 
middle: valves sometinies rosy, 5 to 6 min, long (exceptionally 7 by 9 mm.), deltoid- 
ovate, often only slightly cordate, remotely crose or denticulate, rounded or obtuse 
at apex without callosities: achene 2 to 2.5 by 41mm.—Damp or rich soil, in the moun- 
tains of Texas (extending from the far north), 
5. R. crispus L. Erect, rather stout, 6 dm. high, simple, glabrous to slightly 
papillate: leaves bluish green, the petiole and principal veins papillate, very wavy 
margined, the lowest ample, elliptical to mostly oblong-lanceolate, rather obtuse, 
rounded or decurrently acutish at base: flowering branches rather strict, somewhat 
