CLASS VI. ORDER III. ]53 



the end; the petiole and midrib often red on the upper side. 

 Calyx leaves heart-shaped, reticulated, furnished with long, sub- 

 ulate teeth, one only bearitig a full, distinct grain. — July. — Pe- 

 rennial. 



These two species, originally from Europe, are among our 

 most troublesome weeds. 



* RuMEX Pallidus. White Dock. 



JR. foliis lineari-lanceolatis, acidis ; spicis graciU- 

 bus ; valvulis ovatis, integris, grarumi vix super anti- 

 bus. 



Leaves linear-lanceolate, acute ; spikes slender ; 

 valves ovate, entire, hardly larger than the grain. 



Stems numerous, ascending, smooth, round, slightly furrowed. 

 Leaves smooth, linear-lanceolate, acute, petoled, more or less 

 waved on the margin. Spikes slender, owing to the shortness 

 of the pedicels, the largest with a leaf at base. Calyx linear, 

 acute. Petals ovate, obtuse, erect. Stamens six, anthers whitish, 

 two lobed. Styles three. Fruit crowded, the valves ovate, en- 

 tire or furnished with a single tooth at base, with a large, white, 

 fleshy, obtuse grain nearly covering the back of each. — Salt 

 marshes. — June. — Perennial. 



First sent by Dr. Nichols from Danvers. 



RuMEx Britannica. L. Yellow rooted Water Dock. 



Valves very entire, all of thera graniferoiis ; leaves 

 lanceolate with obsolete sheaths. 



A tall species growing in deep mud in watery situations. 

 Leaves broad-lanceolate, smooth and even. Stem furrowed, sur- 

 rounded above the joints with torn sheaths, a character which 

 distinguishes it from Ruraex vcrticillatus, another aquatic spe- 

 cies with tubular sheaths. Valves of the Calyx large, heart- 

 shaped, entire, each bearing a grain. — July. — Perennial. 



RuMEX AcETOSELLA. L. Sorrcl. Sheep' s Sorrel. 



Flowers dioecions, leaves lanceolate, hastate; calyx 

 valves without grains. 



