80 | Rhodora [APRIL 
Growing as a native in Europe and occasionally as an adventive 
in America is Rumex limosus Thuill., which is closely allied to Rumex 
maritimus. The former is variously interpreted as a hybrid or as a 
distinct species, depending solely on the point of view of the author, 
since no experimental verification of this point has been made. Rumex 
limosus seems to be recognizable by the separation of the inflorescence 
into distinct glomerules, the swollen, campanulate tip of the pedicel, 
and the greater proportional breadth of the valves. 
KEY TO THE AMERICAN MEMBERS OF THIS GROUP. 
A. Tubereles turgid, elliptic-ovate in outline, pale straw-colored; length of 
the bristles about equal to the breadth of the valves. ..R. persicarioides. 
Tubercles linear-lanceolate in outline, brown, or tinged with red; bristles, 
when present, 1.5-2 times as long as the breadth of the valves. 
Medial cauline leaves linear-lanceolate, cuneate at base, plane, 
J'EN SS aara vs Veo Reach ron eae ene R. maritimus. 
B. Medial cauline leaves broadly lanceolate or linear-lanceolate, cordate 
or truncate at base, often crisped on the margin, American. 
C. Bristles present, 1.5-2 times as long as the breadth of the valves. 
R. maritimus L., var. fueginus. 
C. Bristles nearly or completely wanting. 
R. maritimus L., var. athrix. 
In the following citation of specimens the parenthetical letter 
indicates the Herbarium in which these specimens may be found: 
(A) = Academy of Natural Sciences of Philadelphia; (H) = Gray 
Herbarium; (M) = Missouri Botanical Garden; (N) = New Eng- 
land Botanical Club; (Y) = Eaton Herbarium, Yale University. 
RUMEX PERSICARIOIDES L. Sp. Pl. i. 335 (1753), not Trelease, 3d 
Ann. Rep. Mo. Bot. Gard. 93 (1892), and subsequent American au- 
thors.— QueBEc: island of the Richelieu, Chambly, August, 1914, 
Bros. Rolland & Victorin no. 562 (H); margin of a salt marsh, Cacouna, 
August 31, 1904, J. F. Collins and M. L. Fernald (H). PRINCE 
Epwarp IsLAND: edge of a salt marsh, Malpeque, August 20, 1914, 
Fernald and St. John, no. 11,038 (H); wet brackish sand, Grand 
Tracadie, August 31, 1912, Fernald, Long, and St. John, no. 7,341 (H); 
August 22, 1914, Fernald and St. John, no. 11,039 (H); border of salt 
marsh, Bunbury, August 9 and 28, 1912, Fernald, Long, and St. John, 
nos. 7,338 and 7,340 (H). Massacnuserts: sandy cove, Bay View, 
Gloucester, August 15, 1897, E. F. Williams (H & N), and W. P. Rich, 
(H). 
Rumex Maritimus L. Sp. Pl. i. 335 (1753); Rouy et Fouc. Fl. Fr. 
xii. 78 (1910); Asch. und Graeb. Syn. iv. 702 (1912); Reichenb. Ic. 
Fl. Germ. xxiv. t. 186 (1909). An adventive in America. NEW 
