44 ROLAND M. HARPER 



foliage present at any one time represents more than one year's 

 work. 



The delta vegetation in Dobrudja studied by Miss Pallis con- 

 tained quite a number of the same species found in the fresh and 

 brackish marshes near College Point and elsewhere along our 

 Atlantic coast, as well as some others not quite identical with 

 ours but closely related. The most prominent plant there was 

 a variety of Phragmites communis, represented by two forms 

 differing in age; a stout juvenile form sometimes 17 feet tall, 

 with 12 to 1^ stems per square yard, and a slender adult form 

 with about 90 to 130 stems per square yard. Miss Pallis 

 weighed these in the fresh state only, and found both forms 

 yielding about 14,500 to 19,400 pounds per acre of aerial parts 

 and about the same of rhizomes. 



Dr. Stout's Wisconsin bog vegetation, which contained many 

 of the same species that occur in fresh marshes on Long Island, 

 was cut the second half of August, and the yield of air-dry 

 hay per acre ranged from 3430 pounds where the vegetation 

 was about three-fourths Car ex stricta to 7078 pounds where 

 Calamagrostis Canadensis was the most abundant plant. These 

 figures are somewhat below most of mine, but perhaps only be- 

 cause his hay was cut earlier in the season. 



Dr. Griffiths, in the papers cited, found the annual growth 

 of Plantago fastigiata in southern Arizona to be from 16 to 2466 

 pounds (dry) per acre, and of miscellaneous herbaceous vege- 

 tation from 15 to 1529 pounds, with an average of 270 pounds in 

 spring and 799 in summer, or 1069 for the whole growing season. 

 Professor Wooton arrived at very nearly the same average in 

 the same region. 



Dr. Shantz's Colorado hay was cut on August 23, 1909, and 

 the yield per acre on "short grass" land was only 116 to 240 

 poundfe per acre, while that on bunch-grass {Andropogon sco- 

 parius) land was 840 pounds. The bunch-grass land is very 

 similar in aspect to the Hempstead Plains of Long Island, and 

 has the same dominant grass. The soil is doubtless more fer- 

 tile than most of that on Long Island, but the deficient rainfall 

 in Colorado probably accounts for the low yield of hay, as is 

 the case also in Arizona. 



