bap per” ) 
UNS 
3. Rumex L. Dock. 
| herbs -i-—ewn—wegiony wi th creeping or tuberous roots tocks 
: ioaeeniassemnamnmaien mente borer beret ty > loaves chiefly basal, 
al ternate,on a PRO Oem Ppow—pewvey Commonly lanceolate, 
glabrous, the/margin frequently undulate or Crisped; stipules sheathing; 
flowers in terminal panicles, @n and small, perfect or dioecious; perianth 
of 6 segments’, the outer smal 4 narrow, the inner larger, generally ovate, 
j in fruit and enclosing the achene, reticulatély veined, either with 
or without 4 prominent}tubercle near the base, due to the thickening of the 
midvein. Stamens 6. Styles 3, tufted. Achenes ovoid, J-angled, shining. 
© Leaves mostly basal, the petioles as long as the blades or 
4 longer; flowers diofpiious; plants 20-40 em. tall 
& Leaves hastate, i.e. with two spreading lobes at the 
base iB R. Acetosella 
r, Leaves oblong-lanceolate, tapering at the base 2. Re paucifolius 
© Leaves distributed along the stem but more or less |. 
4 reduced upwards; petioles shorter than the blades; 
lowers perfect; plants 40-100 em. tall or more 
{) 2 Inner perianth segments of mature fruit bearing a 
Conspicuous “eee te tubercle on the back 2 ies 
4 Perianth segments entre or eroded on the frp 
peta Siar toothedy, all three bearing 
g tubercles 
G Stems erect; from elongate tap roots; 
lower leaves obtuse to cordate at 
/O\ tne base, 3-5 cm. wide or more, 
strongly undulate and crisped 3, Be crispus 
{ Stems several,decumbent at the base, 
arising from a woody caudex with 
Jo yellowish bark; all leaves attenuate 
at the base, 1-2.5 cm. wide, hardly 
undulate A. Re mexicanus 
4 Perianth segments toothed, more or less bur- 
8 like 
Se ‘. 
( All periantn segments bearing tubercles; 
/OD glomerules com act; leaves 1-2 cm. wide f° 3. mritinus 4 
G6 One perianth segment in each flower With a . 
/ tubercle; glomerules loose; leaves 3-6 @ 
q /0 \\eme wide or more 6. Re obtusifolius 
¢ Inner perianth segments of mature ?ruit Smooth, not 
@ bearing tubercles 7, Re occidentalis 
