CONTENTS 
BRITTON, leans Lorp. Studies of West Indian plants— 
HarPER, AND M. A quantitative, volumetric and saa study of 
the sian Taeda belt of Bsc and the Fagen we 39 
RYDBERG, PER AXEL. Notes on Rosaceae— 65 
BuTLER, O. On the cause of slau pathtere in tie ape (plates ne - 85 
Reep, E. L. Meadow — in the montane region of northern 
Colneadn - 97 
Gates, R. R. A revision of the genus Potygonatum in Nok Ainctics 
(plates 4 Say 
ae ‘New E. Se sevtas influencing the prevalence o of Endothia 
~“¥37 
Masta peney, Vion. he dauitabed list “of the foteat trees of the 
Hawaiian Archipelago - 145 
BERRY, Epwarp W. Co stributieae to thie Mexctoie joes of eu Adank 
coastal plain, XI1I—Arkansas (plate 7) . - 167 
Evans, ALEXANDER W. Notes on the genus Se es wit “ith a revision of 
the-species known from tints Canada and the United States ae) 
8) I9I 
_ Ga W. fines. on een os Lobetioideae, with descriptions of 
ew species and varieties (plates 29 
Potad ALFRED . Acritical gene’ of certain —— of Aline elas 
17-20 - 241, 287 
Harris, J. oes Dommae ‘ides feet ‘aad ‘Lwin Joun V. 
The relationship between the osmotic concentration of eal =P and 
height of leaf insertion in trees 267 
RippLe, LINcoLN W. Some Kohepeani ickene Pes facies (plate 21) 321 
Berry, Epwarp W. A middle Eocene Goniopteris (plate 22) - S41 
Pukweta, Francis W. Noteson plants of the southern United Sees Ai 7 cad 
BICKNELL, EUGENE P. The ferns and sieeudes plants of Nantucket 
XVIII - - - - - 369 
Hooker, Henry D., JR. ‘Mechanies of movement in Picair fotindifolia 389 
SMITH, CHARLES PIPER. Studies in the genus ee —I. ie 
of the subgenus Platycarpos 
ee PauL CARPENTER. The Chenopodiaceae of the N aa Aaetiale 
Flo Il 
patria a A Phytogeographical notes on the Rocky eountein Region 
Formations in the Subalpine Zone 
Gouna , J. H. Fruit bud formation—a criticism - - 455 
GLEASON, Henry ALLAN. The structure and development ot the lant 
association 3 
WEATHERWAX, Pati, The development of the spikelets of “Zea Mays 
(plate 23) - 
iii 
