46 INDEX TO AMERICAN BOTANICAL LITERATURE 
Lloyd, F. E. Guayule (Parthenium argentatum Gray). A_rubber- 
plant of the Chihuahuan desert. Carnegie Instit. Washington 
Publ. 139: 1-213. pl. 1-46 + f. 1-20. 27 Jl 1911. 
MacDougal, D. T. A new high temperature record for growth. Sci- 
ence II. 53: 370-372. 15 Ap 1921. 
MacDougal, D. T., & Spalding, E. S. The water-balance of succulent 
plants. Carnegie Instit. Washington Publ. 141: 1-77. pl. 1-5 +f. 
1-16. 29D 1910. 
Macpherson, G. E. Comparison of development in dodder and morn- 
ing glory. Bot. Gaz. 71: 392-398. pl. 25-27. 16 My 1921. 
Malme, G. O. A.-N. Asclepiadaceae riograndenses adjectis notulis de 
ceteris Asclepiadaceis in Brasilia extratropica, Uruguay et Misiones 
collectis. Arkiv Bot. 16: 1-34. 23 D 1920. 
Includes new species in Roulinia (1), Calostigma (1). 
Mameli de Calvino, E. Estudios anatomicos y fisiologicos sobre la 
cafia de azucar en Cuba. Estac. Exper. Agron. Santiago, Cuba, 
Bol. 46: 1-49. f. 1-21. 
Marsh, C. D., & Clawson, A. B. Poisonous properties of the whorled 
_ milkweeds Asclepias. pumila and A. .verticillata var. Geyeri. U.S. 
Dept. Agr. Bull. 942: 1-14. pl. 1-3 +f. 1, 2. 4 My 192%. 
Mason, T. G. A note on some recent researches on the cotton plant in 
the West Indies, with special reference to St. Vincent. West Indian 
Bull. 18: 184-197..pl..1,,2. [1921.] 
Mason, T. G. The water-balance of the plant and its significance in 
crop production. West Indian Bull. 18: 157-184. [1921.] 
Massey, L. M. Experimental data on losses due to crown-canker ot 
_rose. Phytopathology 11: 125-134. Mr 1921. 
Matz, J. Infection and nature of the yellow stripe disease of cane 
(mosaic, mottling, etc.). Jour. Dept. Agr. Porto Rico 3°: 65-32. 
f. 1-11. O1919. xe 
Matz, J. Obeservaciones en la gomosis de la cana en Puerto Rico. 
Revista Agr. Puerto Rico 64: 33-39. 30 Ap 1g2t. [Illust.] 
[Maxon, W. R., & Killip, E. P.] Botanical exploration in Jamaica 
[1920]. Smithson. Misc. Coll.-72°: 49-54. f. 61-66. 1921. 
Mayes, J. The practical control of weeds in Missouri meadows and 
pastures. Bull. Missouri Board Agr. 18: 1-36. Je 1920.  [Illust.] 
McAtee, W. L. Notes on Viburnum and the assemblage Caprifoli- 
aceae. Bull. Torrey Club 48: 149-154. f. r. 25 My 1921. 
McDougall, W. B. Thick-walled root hairs of Gleditsia and related 
genera. Am. Jour. Bot. 8: 171-175. f. 1-3. 3 Ap 1921. 
