This is the author manuscript accepted for publication and has undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record . Please cite this article as doi: 10.1111/GCB.14032 This article is protected by copyright. All rights reserved DR. PHILIP A FAY (Orcid ID : 0000-0002-8291-6316) DR. RICHARD A GILL (Orcid ID : 0000-0001-8981-0621) DR. VIRGINIA L. JIN (Orcid ID : 0000-0003-4146-8497) DR. H WAYNE POLLEY (Orcid ID : 0000-0002-1197-8800) Article type : Primary Research Articles Flowering in Grassland Predicted by CO 2 Running Head: CO and Resource Effects on Species Aboveground Biomass 2 Philip A. Fay and Flowering 1* , Michael J. Aspinwall 2 , Harold P. Collins 1 , Anne E. Gibson 1 , Richard H. Gill 3 , Robert B. Jackson 4 , Virginia L. Jin 5 , Albina R. Khasanova 6 , Lara G. Reichmann 6 , H. Wayne Polley 1 1 USDA-ARS Grassland, Soil, and Water Research Lab, 808 E Blackland Road, Temple, TX 76502 USA 2 Department of Biology, University of North Florida, 1 UNF Drive, Jacksonville, FL 32224, USA 3 Brigham Young University, Department of Biology, 4102 LSB, Provo, UT 84602, USA 4 Stanford University, Department of Earth System Science, Y2E2 Building, 379B, Stanford, CA 94305 USA 5 USDA-ARS Agroecosystem Management Research Unit, 251 Filley Hall, University of Nebraska, Lincoln, NE 68583 USA 6 Section of Integrative Biology, The University of Texas at Austin, 1 University Station C0930, Austin, TX 78712 USA. Author Manuscript