vi CONTENTS OF VOLUME XXV [JUNE 
A contribution to the life-history of Euphorbia corollata (with 0 XXII-XXIV), 
rence May Lyon 
A biological note on the size of evergreen needles, - Edwin oe ii Copeland 
Some reasons why the Rochester nomenclature cannot be ae as a con- 
sistent or stable system, - B. L. Robinson 
BRIEFER ARTICLES— 
Cynodon or Capriola? - - - Theo Holm 
Root propagation of Ipomcea leptophylla iadene’ George L. Clothier 
Notes on Lilzopsis, - - John M. Coulter and J. N. Rose 
The physiological problems of today, - - Jacques Loeb 
Aphyllon Ludovicianum on Ambrosia trifida Gimmens - J. Schrenk 
Bidens connatus Mihl., - - - - - - C. Warnstorf 
Aerial tubers of Solanum tuberosum (illustrated), - W. R. Dodson 
The tree opuntias of the United States, - - . J. W. Toumey 
Winter characters of certain sporangia (with plate x1), 
Charles Chamberlain 
Potamogeton Robbinsii (with plate xv), - - - - EZ. J. Hill 
Wyoming junipers (illustrated), - - - Aven Nelson 
The morphological significance of the lodicules of grasses, - W. W. Rowlee 
Notes on Carex. - - - L. H. Bailey 
The systematic position of the genus Monoclea, 
Douglas Houghton Campbell 
The Rocky mountain species of Thermopsis (with plate xv111), 
nn Nelson 
’ 
Notes on the botany of the southeastern states. I, II, III, 
C.D. Beadle 276, 357; 
The gum of Canna, - - - - - M. L. Luts 
The wild flowers of Cushing’s island, Maine, - Harold B. Cushing 
A new species of Apios from Kentucky (illustrated), - 2. LZ. Robinson 
A contribution to the esc oetasleid of the flora of Tuscola county, Michi- 
gan, - - Charles A, Davis 
EDITORIAL— 
The standpoint of criticism, - - - - - - - - - 
OprEN LETTERS— 
A vey 8 as es ee . - Erwin F. Smith 
Botany at Brown University, - - - William Whitman Bailey 
- - John W. Harshberger 
Aerial tubersofSolanum,- - - . - : - WJ. Beal 
A Mexican tropical botanic station, - 
418~ 
427 
437 
270 
272 
275 
446 
280 ° 
353 
450 
453 
459 
