106 



POLYGONACEAE 



Rumex 



o 50 



Map 825 



Rumex Acetosella L. 



"TO 



Map 827 



Rumex verticillatus L. 



Peattie observed (Amer. Midland Nat. 10: 130. 1926) that one valve of 

 each fruit had a complete tubercle and a second valve might have an 

 aborted tubercle. He gave this form a name, but if he had read carefully 

 the original description of the species, he would have seen that this phe- 

 nomenon was included in the description of the species. The tendency to 

 double the number of tubercles is frequent among the fruits of this species. 



Conn, to N. Dak., southw. to Md. and Tex. 



3. Rumex verticillatus L. Swamp Dock. Map 827. Found in the 

 muddy borders of ponds, swamps, and sloughs in all parts of the state. 

 Where it is found, it sometimes forms dense colonies. 



Que. to Iowa, southw. to Fla. and Tex. 



4. Rumex triangulivalvis (Danser) Rech. f. Map 828. (Rumex mexi- 

 canus of Indiana authors, not Meisn.) This species and species no. 2 

 are very similar and can be distinguished only by the number of valves 

 which bear tubercles. 



In addition to my records, this species has been reported only from 

 St. Joseph County. I believe it is much more frequent, however, than 

 our reports indicate simply because it is so easily confused with R. 

 altissimus and both have the same habitat. 



Newf. and Lab. to B. C, southw. to Maine, Ind., Mo., and along the 

 Rocky Mts. to Mex. 



5. Rumex Britannica L. Great Water Dock. Map 829. Usually in 

 boggy or marshy places but sometimes in a habitat that is rather muddy, 

 such as about ponds and in swamps. Infrequent. No doubt all the re- 

 ports of it from southern Indiana should be transferred to some other 

 species. In 1932, E. B. Williamson found a plant along Pigeon River in 

 Lagrange County that had a leaf with a blade 35 inches long. 



Newf., Ont., and Minn., southw. to N. J. and Kans. 



6. Rumex crIspus L. Curly Dock. Map 830. A common weed in low 



