INDEX TO AMERICAN BOTANICAL LITERATURE 139 
Metcalf, Z.P. Some ecological aspects of the tidal zone of the North 
Carolina Coast. Ecology 1: 193-197. Jl 1920. 
Mignault, LD. Quelques notes sur une mauvaise herbe. Nat. 
Canad. 45: 181-183. Je 1919. 
Euphorbia Helioscopia L. 
Mignault, L.-D. Une plante interessante. Nat. Canad. 45: I0I-103. 
Je 1919. 
Vallisneria spiralis. 
[Moore, G. T.] Hats from plants. Missouri Bot. Gard. Bull. 8: 
113-116. N 1920. 
Mousley,H. Botrychium oblignum Muhl. and var. dissectum (Spreng.) 
new to the province of Quebec. Can. Field Nat. 33:97. N 1919. 
Mousley, H. Further notes on the orchids of Hatley, Stanstead 
County, Quebec, 1919. Can. Field Nat. 33: 44-47. N 10920. 
Murrill, W. A. The fungi of Blacksburg, Virginia. Mycologia 12: 
322-428: : 27: D..1920. 
Includes Pluteus praerugosus sp. nov. 
Murrill, W. A. Plants as an inspiration in the art of early peoples. 
Gard. Mag. 32: 246-248. Ja 192r. 
Nelson, J. C.. Under which code? Am. Bot. 26: 129-135. N 1920. 
Odell, W. S. A rare fungus new to Canada. Can. Field Nat. 34: 
10-13. f. I-6. 1920. 
Osterhout, G. E. Rocky Mountain botany and the Long Expedition 
of 1820. Bull. Torrey Club 47: 555-562. 28 D 1920. 
Palmer, E. J. The ligneous flora of the Staked Plains of Texas. Jour. 
Arnold Arbor. 2: 90-105. 1920. 
Pammel, L. H. Some economic a of botany. Science II. 
53: 4-15. 7 Ja 1921. 
Parish, S. B. The immigrant plants of Southern California. Bull. 
So. Calif. Acad. Sci. 19: 3-30. 1920. 
Includes Zauschneria orbiculata sp. nov. 
Pearson, G. A. Factors controlling the distribution of forest types. 
Ecology 1: 139-159. f. E-8; 289-308. f. 9-11. 1920 
Pennell, F. W. Soil preferences of Scrophulariaceae. Torreya 20: 
10, 11. 1 Ap. 1920. 
Reddick, D. A fourth Phytophthora disease of tomato. Phytopath- 
ology 10: 528-534. D 1920. 
Rhoads, A. S. Studies on the rate of growth and behavior of the 
blister rust on white pine in 1918. Phytopathology 10: 513-527. 
D 1920. 
