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Updated Silvics of North America Project (USNAP)

To view this webpage in Spanish, click here.

To view this webpage in French, click here.

The Silvics of North American has been the go-to reference for foresters and natural resource managers in the United States since 1965 and is considered an essential resource for understanding the fundamental silvics and species ranges of important trees species in North America. While updated in 1990, the 30 plus years since have seen significant changes in species importance, improvements in understanding of species ecology, growth and genetics, and a better understanding of how climate change will impact individual species. Therefore, the USDA SE Climate Hub is co-leading an effort to revise this essential resource.

Read Bringing the Silvics of North America into the 21st Century from The Forestry Source to learn more about the need for this revision and how the framework for leading this project will be structured.

Primary Contacts

Steve McNulty, Principal Investigator, USDA Forest Service, (919) 624-9782,

Cameron Stelly, Coordinator, USDA Forest Service, (713) 304-8071,

Leadership Committee:

The Leadership Committee is divided into co-equal representatives from the United States, Canada and Mexico. The primary responsibility of the Leadership Committee is to provide country-level approval, encourage participation, and solicit funding and personnel to sustain the project.

United States

  • Toral Patel-Weynand
  • Cynthia West
  • Thomas Shuler


  • Amélie Roberge
  • Roxanne Comeau
  • Jean-Martin Lussier
  • Anthony Bourgoin


  • Pedro Antonio Plateros Gastelum
  • Filemón Manzano Mendez
  • Valentin Jose Reyes Hernandez

Core Committee:

The Core Committee is the primary instrument for 1) Developing the structure of the USNA, 2) Overseeing the revision process, 3) Evaluating the species and topics to include, 4) Evaluating topics from the current SNA that need revising, and 5) Soliciting members to the associated teams.

The Core Committee is composed of:

  1. All Project Support Members
  2. All Co-Leads of the 4 Structure Teams
  3. All Co-Leads of the 9 Section Teams

Project Support Members:

Project Support Members are designed to manage critical processes of the USNAP. These include the following:

  1. Principal Investigator
  2. U.S. Coordinator
  3. University Coordinator
  4. Lead Editor
  5. Lead Technology Designer
  6. Lead Interpreter
  7. Process Reviewer

Structure Team:

Structure Teams are designed to manage how the content in their specified category is organized, and play a critical role in the peer review process. Each team will be managed by 2 Co-Leads, and supported by many members. These teams include the following:

  1. Coniferous Team
  2. Deciduous Team
  3. Invasives Team

Section Team:

Section Teams represent each category within a given chapter, and are designed to evaluate the types of information that should be included. Additionally, they play a critical role in the peer review process. Each team will be managed by 2 Co-Leads, and supported by many members. These teams include the following:

  1. Drought Team
  2. Wildfire Team
  3. Insect and Disease Team
  4. Genetics Team
  5. Range and Distribution Mapping Team
  6. Goods and Services Team
  7. Regeneration and Management Team
  8. Urban Context Team
  9. Indigenous / Native Knowledge Team


The cohort of authors associated with the USNAP will be the largest group, having 300 plus members. Each chapter will be assigned to a Lead Author, and supported by co-authors. Authorship will include not only the species in the current SNA, but a variety of new species and content.

Maintenance Team:

The Maintenance Team is designed to manage future updates to any SNA chapter after it passes the USNAP peer review process, and is published online. All chapters will be assigned to a maintenance schedule to ensure that the SNA stays current and reflects the most recent scientific literature.


To see a list of all chapters being considered for the Updated SNA, click here.


To see a list of frequently asked questions pertaining to the project, click here.

Supporting Publications