EDITORIAL
401 AJ Harris and Stefanie M. Ickert-Bond
Continents as Units for the Study of Floristic Assembly and Biodiversity: Focus on North America
REVIEWS
405 Alan Graham
The role of land bridges, ancient environments, and migrations in the assembly of the North American flora
430 AJ Harris, Stefanie Ickert-Bond, and Aarón Rodríguez
Long distance dispersal in the assembly of floras: A review of progress and prospects in North America
RESEARCH ARTICLES
449 Daniel Spalink, Jocelyn Pender, Marcial Escudero, Andrew L. Hipp, Eric H. Roalson, Julian R. Starr, Marcia J. Waterway, Lynn Bohs, and Kenneth J. Sytsma
The spatial structure of phylogenetic and functional diversity in the United States and Canada: An example using the sedge family (Cyperaceae)
466 Mary E. Edwards, Andrea Lloyd, and W. Scott Armbruster
Assembly of Alaska-Yukon boreal steppe communities: Testing biogeographic hypotheses via modern ecological distributions
476 Monte Garroutte, Falk Huettmann, Campbell O. Webb, and Stefanie M. Ickert-Bond
Biogeographic and anthropogenic correlates of Aleutian Islands plant diversity: A machine-learning approach
498 Melanie A. Link-Pérez and Shawn W. Laffan
Fern and lycophyte diversity in the Pacific Northwest: Patterns and predictors
523 Victoria Sosa, J. Arturo De-Nova, and Marilyn Vásquez-Cruz
Evolutionary history of the flora of Mexico: Dry forests cradles and museums of endemism
537 Aarón Rodríguez, Arturo Castro-Castro, Georgina Vargas-Amado, Ofelia Vargas-Ponce, Pilar Zamora-Tavares, Jesús González-Gallegos, Pablo Carrillo-Reyes, Marco Anguiano-Constante, Marco Carrasco-Ortiz, Miguel García-Martínez, Brandon Gutiérrez-Rodríguez, Juvenal Aragón-Parada, Christian Valdes-Ibarra, and Guadalupe Munguía-Lino
Richness, geographic distribution patterns, and areas of endemism of selected angiosperm groups in Mexico
550 Harlan T. Svoboda and AJ Harris
Contributions toward understanding the biodiversity of Passiflora in North America: Updates and a new combination from the Baja California Peninsula, Mexico and vicinity
562 Qiao-Ping Xiang, Ran Wei, Yan-Mei Zhu, AJ Harris, and Xian-Chun Zhang
New infrageneric classification of Abies in light of molecular phylogeny and high diversity in western North America
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