BOTANY OF LA SAL,LE COUNTY. 117 



Rum ex. P. Dock. Sorrel. Tall, leaves large, 

 usually thick., fls. G., in a larg-e panicle. Fruit 

 3 angled. 



R. Britan nica. Leaves long-lanceolate, 1 ft. or 

 more; 4- to 6 ft. Wet places. 



R. altis simus. Pale Dock. Gayish G., very 

 smooth, 2 to 6 ft. 



R. cris pus. Curled Dock. Leaves narrow, margins 

 crisped. 



R. obtusifo lia. Bitter Dock, leaves broad. 



R. sanguineus. Veins of leaves red. 



R. acetosel la. Horse Sorrel. Sorrel, small, 6 to 

 12 in., fls. red; sour. 



Polyg onum. Knot weed. Smart weed. Leaves lance- 

 olate, acuminate. 



P. avicula re. More or less prostrate, pale G.; 

 leaves small, fls. W., stamens 8. 



P. ramosis simum. Tall, 2 to .5 ft., branching-; 

 leaves small, scattered. 



P. ten ue. Stem angled, 1 to \% ft. Dry lands. 



P. lapathifo Hum. A. Stamens 6. 



P. lapathifo Hum var, incarnatum. Leaves large. 



P. Pennsylvan icum. Stamens 8; peduncles glan- 

 dular. Moist places. 



P. amphibium. P. Grows in water. R. 



P. orienta le. Princess Feather. P. Gardens. 



P. Persica ria. Leaves with a dark spot. 



P. hydropiperoi des. Ditches and wet grounds. 



P. hydrop iper. Water pepper. Fls G. and Rs. 



P. arifolium. Stem prickly. 



P. sagitta turn. Prostrate, square, rough, 



P. convol vulus. Prostrate or climbing. Fls. W. 



P. dumetorum. Fruit winged at angles. 



Fagopy rum esculen turn. Buckwheat. 



Podoste mon ceratophyl lus. River weed. In river. 



