30 INDEX TO AMERICAN BOTANICAL LITERATURE 
Urban, I. Uber die Malvaceen-Gattung Montezuma Moc. et Sessé. 
Notizbl. Bot. Gart. und Mus. Berlin-Dahlem 7: 543, 544. 1 Mr 
1921. 
Wakefield, E. M. Mosaic diseases of plants. West Indian Bull. 18: 
197-206. [1921.] 
Walker, E.R. The gametophytes of Equisetum laevigatum. Bot. Gaz. 
471: 378-391. pl. 23, 24 +f. 1-3. 16 My 1921. 
Walker, J.C. Onion smudge. Jour. Agr. Research 20: 685-721. pl. 
80-85 +f. I-10. 1 F 1921 
Walker, J.C. Rust of onion followed by a secondary parasite. Phyto- 
pathology 11: 87-90. f. 1, 2. F 1921. 
Weatherby,C.A. Aformof Jlexopaca. Rhodora 23:118, 119. 19 My 
1921. 
Weir, J. R. Thelephora terrestris, T. fimbriata, and T. caryophyllea 
on forest tree seedlings. Phytopathology 11: 141-144. pl. 5. Mr 
1921. 
Wells, B. W. Evolution of zoocecidia. Bot. Gaz. 71: 358-377. pl. 21, 
22. 16 My 192I. : 
Wells,B. W. A phenomenal shoot. Science II. 54: 13,14. 1 Jl 1921. 
Paulownia tomentosa. 
Weston, W. H. Another conidial Sclerospora of Philippine maize. 
Jour. Agr. Research 20: 669-684. i. 76-79. 1 ¥F 1921. 
Whaley, W. Properties of wood. A chapter from Lucien Chancerel’s . 
Botanique Forestiére. Jour. For. 19: 414-420. Ap-1921. 
White, O. E. The pollination of flowers. Brooklyn Bot. Gard. Leafl. 
Qn. 3,4: 1-15. 4 My 1921. 
Wiegand, K. M. Amelanchier amabilis, a new name. Rhodora 23: 
48. 5 Ap Ig2t. 
Wiegand, K. M. Echinochloa in North America. Rhodora 23: 49- 
65. 20 Ap 1921. 
Includes E£. paludigena sp. nov. and several new varieties. 
Wieland, G. R. Monocarpy and pseudomonocarpy in the cycadeoids. 
Am. Jour. Bot. 8: 218-230. pl. 9-12. 30 Ap 1921. 
Williams, C. B. Report on the Froghopper Blight of sugar-cane in 
Trinidad. Mem. Dept. Agr. Trinidad and Tobago 1: 1-170. i. 
I-11 +f. 1-32. Ja 1921. 
Considers also ‘‘The Root Disease of Sugar Cane” caused by fungi. 
Yunker, T. G. A Curious abnormality in Cuscula cuspidata. Am. Bot. 
27: 48,49. My 1921. [Illust.] 
