112 INDEX TO AMERICAN BOTANICAL LITERATURE 
Thellung, A. Die Gattung Zepidium (L.) R. Br. Eine monograph- 
ische Studie. Neue Denks. Allg. Schweiz. Ges. 41: 1-340. f. I- 
I2. 1906. 
Tullsen, H. The probable origin of key-fruits. Plant World 9: 
233-236. [N] 1906. 
Underwood, L. M. A report on the condition of the tropical labora- 
tory. Jour. N. Y. Bot. Gard. 7: 250-255. N 1906. 
Wangerin, W. Die Umgrenzung und Gliederung der Familie der 
Cornaceae. Bot. Jahrb. Beibl. 86: 1-88. f. z~ro. 14 Au 1906. 
Wiegand, K. M. & Foxworthy, F.W. A key to the genera of woody 
plants in winter, including those with hardy representatives found 
growing wild or in cultivation within New York State. Second edi- 
tion. "1-33. Ithaca, N. Y., 1906. 
Wright, C. H. Achatocarpus pubescens. Kew Bull. Misc. Inf. 1906: 
6. F 1906. 
New species, native of Ecuador. * 
Wright, C. H. Astragalus brevidentat Kew Bull. Misc. Inf. 
1906: 200. Au 1906. 
New species, native of the Galapagos Islands. 
Wright, C.H. Bidens simplicifolia. Kew Bull. Misc. Inf. 1906: 5. 
F 1906. 
New species, native of Ecuador, 
Wright, C.H. LZuterpe Jenmanii. Kew Bull. Misc. Inf. 1906: 203- 
Au 1906, 
New species, native of British Guiana. 
Wright,C.H. L£uterpe ventricosa. Kew Bull. Misc. Inf. 1906: 203. 
Au 1906. 
New species, native of British Guiana, 
Yamanouchi, S. ‘The life-history of Polysiphonia violacea. Bot. Gaz. 
42: 401-449. pl. 19-28. 22 D 1906. 
