Glossary of Plant Systematics (1st ed.) by Simpson (2006)
- A compound leaf with three leaflets. Syn: trifoliolate. (leaf type)
Glossary of "Flora of Okinawa and the Southern Ryukyu Islands" by Walker (1976)
- In 3's, as three leaves in a whorl. 三出の
- Simpson, M. G. 2006. Plant Systematics. -xi + 590 pp. Elsevier Academic Press, Oxford.
- Walker, E. H. 1976. Flora of Okinawa and the Southern Ryukyu Islands. ix + 1159 pp. Smithsonian Institution Press, Washington, D. C.