CATALOGUE OF PLANTS. 141 



R. Britannica, L. GREAT WATER DOCK. 



Common in swamps and wet places back of sea beaches ; less 

 common in wet ground farther inland, Long Pond meadows; 

 Somesville (Eedfield). 



R. salicifolius, Weinm. WHITE DOCK. 



Sea beaches; frequent, especially on Cranberry Isles and 

 western and northern shores of the Island. Also Northeast 

 Harbor; Sea Wall (Rand) ; Bar Harbor (W. H. Manning). 



R. verticillatus, L. SWAMP DOCK. 



Hare. Marsh on Northeast Creek; Norwood Cove (Rand). 



R. CRISPUS, L. CURLED DOCK. 



Common in cultivated and waste ground. Naturalized from 

 Europe. 



R. OBTUSIFOLIUS, L. BlTTER DOCK. 



Waste places ; rare. Somesville (Rand) ; Bar Harbor (W. 

 H. Manning). Adventive from Europe. 



R. ACETOSELLA, L. FlELD SORREL. 



A very common weed in fields and waste places. Naturalized 

 from Europe. 



POLYGONUM, L. KNOTWEED. 

 P. aviculare, L. DOORWEED. 



A common weed about dwellings, by roadsides, etc. Vari- 

 able; erect or prostrate. 



P. Rail, Bab. 



Stems long, straggling, prostrate; leaves bending towards 

 the stem, elliptic-lanceolate, flat; ochrese lanceolate, acute, with 

 few distinct simple veins, at length torn; nut smooth, shining, 

 exceeding the perianth. Resembling P. aviculare in habit, 

 but P. maritimum in fruit. Filaments broader at the base. It 

 varies with smaller leaves and flowers. Babington, Man. Brit. 

 Bot. (4th ed.) 285. Common on sea beaches. This species has 

 been often mistaken for P. maritimum, and so reported. So 

 far as known, however, P. maritimum is not found within the 



