76 POLYGONACEAE 



Leaves hastate. 1. R. Acttosella. 



Leaves not hastate. 



Sepals hristle bearin<^. 8. R. pernicarioides. 



Sepals not bristle-bearing- 



Sepals 3'' broad or more in fruit. 5. R. Putientia. 



Sepals less than 'i" broad in fruit. 

 Tubercle usually one. 

 Sepals spinj'. 

 Sepals not spiny. 

 Tubercles usually three. 

 Leaves wavy-margined. 

 Leaves not wavy-margined. 



Pedicels about length of fruiting calyx. 

 Pedicels 3-5 times length of fruiting calyx. 



1. R. Acetosella L. Sheep Sorrel. Dioecious, 6^- if/ high: leaves 

 lanceolate-hastate : fruit not winged. — Not uncommon in fields and waste 

 places. May-June. 



2. R. salicifollus Weinm. White Dock. Glabrous, l°-5° high : 

 leaves oblong-lanceolate. — Common on sand-bars along the Missouri River 

 and in waste places. May-October. 



3. R. verticillatus L. Swamp Dock. 3°-5°high: leaves lanceolate 

 to oblong-lanceolate. — Frequent in swamps near Lake City and Sibley. 

 May-August. 



4. R. altissimiis Wood. Tall Dock. 2°-4° high, very glabrous : 

 leaves oblong-lanceolate: pedicels about the length of the fruiting calyx. 

 — Common in waste places and moist grounds. May-.Iuly. 



5. R. Patientia L. Patience Dock. 3°-5° high : leaves large, the 

 lower ovate-oblong, the upper oblong-lanceolate: pedicels 2-4 times the 

 length of fruiting calyx: tubercle one. — Along the railroad near Pixley's 

 Switch. Rare. Abundant near Argentine and Nearman, Kansas. May- 

 July. 



6. R. ciispus L. Curled Dock. 1°-4° high : leaves lanceolate or 

 oblong-lanceolate: pedicels 1-2 times the length of fruiting calyx. — 

 Very abundant in waste places. May-July. 



7. R. obtuBifolius L. Bitter Dock. 1°-4° high: leaves oblong-lan- 

 ceolate, cordate or rounded at base : pedicels longer than fruiting calyx. — 

 Common in waste places. May-July. 



8. R. persicarioides L. RiVKU Dock. 8'-21' high, pubescent: leaves 

 long-lanceolate, wavy-margined: racemes leafy-bracted: llowers densely 

 whorled: pedicels slightly longer than fruiting calyx: tubercles three. — 

 Common on sand-bars along the .Missouri River. May-October. 



2. FAGOPYRUM Caertn. 

 Annuals. Sepals live. Stamens eight. Styles three. Stigmas capi- 

 tate. Achene triangular, longer than the calyx. Flowers in racemose 

 panicles. 



