76 POLYGONACEAE 



Leaves hastate. 1. R. Acttosella. 



Leaves not hastate. 



Sepals bristle-bearing. 8. B. persicarioides. 



Sepals not bristle-bearing. 



Sepals 3" broad or more in fruit. 5. R. Patieniia. 



Sepals less than 3 /x broad in fruit. 

 Tubercle usually one. 



Sepals spiny. 7. R. oltusifolius. 



Sepals not spiny. 4. R. altissimus. 



Tubercles usually three. 



Leaves wavy-margined. 6. R. crispus. 



Leaves not wavy -margined. 



Pedicels about length of fruiting calyx. 2. R. salicifolius. 

 Pedicels 3-5 times length of fruiting calyx. 3. R. verticillatus. 



1. R. Acetosella L. SHEEP SOREEL. Dioecious, 6 / -15 / high: leaves 

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

 places. May-June. 



2. R. salicifolius 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. 3-5high: leaves lanceolate 

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

 May- August. 



4. R. altissimus 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-July. 



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. crispus L. CUELED DOCK. l-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. obtuaifolius L. BITTEE DOCK. l-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. RIVER DOCK. 8 / -24 / high, pubescent: leaves 

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

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

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



2. FAGOPYRUM Gaertn. 



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

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

 panicles. 



