CONTENTS 
Howe, R. Heper, Jr. A manual of the genus Usnea, as represented in 
North and Middle America, north of the 15th parallel (with plates 1-7) 
Berry, Epwarp W. Contributions to the Mesozoic flora of the Atlantic 
coastal plain—IV. Maryland (with plate 8) - 
Wooron, ELMER Ortis. The larkspurs of New Mexico - - 
BICKNELL, EUGENE P. The ferns and flowering plants of dace 51 
-_ 
Hirsu, PAULINE E. The development of air chambers in the Ricciaceae - 73 
GaTEs, FRANK C. The validity of Helianthus illinoensis as a = - - 79 
Witson, Percy. Notes on Rutaceae—III_ - - 85 
THOMPSON, ELIZABETH ILSLEY. The a of Taenioma vt plates 
9 and Io) 
HarrPer, Rotanp M. A Ciel and teas trip on the Warrior and 
mbigbee rivers in the coastal plain of Alabama = 
ee Per AXEL. Studies on the Rocky Mountain flora—XXI - 127 
ABRAMS, LE Roy. Studies on the flora of Southern California - - 149 
DowELL, Putip. The violets of Staten Island (with plates 11-18) - - 163 
Berry, Epwarp W. Contributions to the Mesozoic flora of the Atlantic 
coastal plain—V. North Carolina (with plates 19-24) - . - 181 
SLosson, MARGARET. One of the hybrids in Dryopteris - - 201 
PATTERSON, FLorA W. Doan ses Tritici sp. nov., associated an floret 
- - 205 
sterility of wheat - - 
HAYNES, CAROLINE COVENTRY. Sshaeseeetpon hians sp. nov. eo a re- 
vision of the genus and illustrations of the species (with mete ae 215 
MACKENZIE, KENNETH KENT. Notes on Carex—VI. - 
Brown, Harry B. The genus ee with some theories concerning 
the origin of its species - 
McGrecor, ErNEst A. Two new seed-plans from ee Lake eae region, 
California a cie = OOS 
Bovie, WILLIAM T. The effect of adding sais to fi soil on the amount 
2 
of non-available water . 
CAMPBELL, DoucLtas H. The niaheyeaie of Pandanus coronatus - - 293 
Rock, JosErpH F. Some new Hawaiian plants - * - 207 
Hotiick, Artuur. A new fossil fucoid (with plate 33) - 2 - 395 
Humpureys, Epwin W. The name Buthotrephis gracilis Hall - 309 
RYDBERG, PER AXEL. Studies on the Rocky Mountain flora—-XXIL. - 313 
Britton, NATHANIEL Lorp. Studies of West Indian plants—II. 
STEVENS, NEIL E. Discoid gemmae in the leafy gaunt of New ee 365 
RypBERG, PER AxEL. Notes on Rosaceae—IIl.  - Ore 
ill 
