Flora of Oregon

Learn about the diverse plants of Oregon with our beautiful, comprehensive, and research-based reference tools.

The Flora of Oregon is a three-volume reference that will be the state’s only flora published in the past half century and the first illustrated floristic work that exclusively addresses Oregon. Volumes 1 and 2 were published in 2015 and 2020, respectively, and can be purchased directly from the publisher, the Botanical Research Institute of Texas Press, or from other vendors. Volume 3 has a projected publication date of 2025. Upon completion, we estimate detailed descriptions of 4,380 native and naturalized taxa will be published in the three volumes.

Stay informed and keep your Flora up-to-date

  • Errata for volumes 1&2
  • Volume 1 & 2 taxa not treated in the printed Flora, but present on our website
  • Taxonomic changes since publication of the flora volumes
  • Glossary of terms used

Each volume is a beautifully illustrated regional flora that informs plant identification. Included are chapters and appendices providing essential context in topics such as ecology, habitats, gardening with natives, and insect-plant relationships.

Sample pages from Oregon Flora

Flora of Oregon Volume 1:

Pterodophytes, Gymnosperms, and Monocots

Flora of Oregon Vol 1

Notable families in Volume 1 include all ferns and fern allies, conifers, sedges (Cyperaceae), grasses (Poaceae), orchids (Orchidaceae), and lilies. Front chapters are richly illustrated with color photographs; they describe the state’s ecology and predominant plant habitats, 50 of the best places to see wildflowers, and biographical sketches of notable Oregon botanists. Appendices detail taxa restricted to a single ecoregion, endemics, and those not collected in more than 50 years.

Flora of Oregon Volume 2:

Dicots Aizoaceae - Fagaceae

Flora of Oregon Vol 2

Notable families in Volume 2 include the sunflowers (Asteraceae), mustards (Brassicaceae), heaths (Ericaceae), and legumes (Fabaceae). Filled with photographs, the front chapters cover gardening with native plants and plant-insect interactions with a focus on butterflies and pollinators. Appendices list butterfly-foodplant pairs, pollinator specialists and their targeted plants, native garden plants that support insects, and features of native species used for gardening and landscaping.