76 POLYGONACEAE 



1. R. Acetosella L. Sheep Soekel. 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 Eiver 

 and in waste places. May-October. 



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

 to obloDg-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. Hare. Abundant near Argentine and Nearman, Kansas. May- 

 July. 



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

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

 Very abundant in waste places. May-July. 



7. R. obtuBifolius L. Bittek 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. Eiveb 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 Eiver. May-October. 



2. PAGOPYRUM Gaertn. 

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

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

 panicles. 



