Glossary of "Plant Systematics (1st ed.)" by Simpson (2006)
- Plant living 1 year or less. (duration)
Glossary of "Evolution of Plants (2nd ed.)" by Willis & McElwain (2014)
- Plants that have a life cycle that is completed in a year.
- Simpson, M. G. 2006. Plant Systematics. -xi + 590 pp. Elsevier Academic Press, Oxford.
- Willis, K. J. & McElwain, J. C. 2014. The Evolution of Plants, 2nd ed. -ix + 398 pp. Oxford University Press, Oxford.