- 早く落ちる, 早落の（日本語）
Glossary of "Plant Systematics (1st ed.)" by Simpson (2006)
- Dropping of very early compared with what is typical, usually applied to floral parts. (duration)
Glossary of "Flora of Okinawa and the Southern Ryukyu Islands" by Walker (1976)
- Falling off early or prematurely, as occurs with stipules and sepals of some plants. 早く落ちる, 早落の
- 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.