Class VI. Order III. 143 



gin, each bearing a grain, of which one is much larger than the 

 other two. Rubbish and cultivated grounds. June. Perennial. 



RUMEX OBTUSIFOLIUS. L. Broad leaved Dock. 



Valves toothed, one chiefly graniferous ; root 

 leaves heart shaped, obtuse ; stem roughish. Sm. 



Grows in the same places as the last, but is somewhat later in 

 its appearance. Root more divided. Stem furrowed, rough 

 near the top. Leaves large, oblong, heart-shaped, obtuse at the 

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

 lyx leaves heart-shaped, reticulated, furnished with long, subulate 

 teeth, one only bearing a full, distinct grain. July. Perennial. 



These two species, originally from Europe, are among our 

 most troublesome weeds. 



* RUMEX PALLIDUS. White Dock. 



R. foliis lineari-lanceolatis, acutis ; spicis graci- 

 libus ; valvulis ovatis, integris, granum vix super- 

 antibus. 



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, petioled, 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. J une. Perennial. 



First sent by Dr. Nichols from Danvers. 



RUMDX BRITANNICA. L. Yelloiv rooted Water Dock. 



Valves very entire, all of them graniferous ; 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 



