Glossary of "A Botanist's Vocabulary" by Pell & Angell (2016)
- Outer, younger, lighter wood of trees; lies outside of the heartwood and is usually considered less desirable for woodworking.
- Pell, S. K. & Angell, B. 2016. A Botanist's Vocabulary: 1300 Terms Explained and Illustrated. 226 pp. Timber Press, Portland.