Glossary of "Life (9th ed.)" by Sadava et al. (2011)
- In some plants, elongated cells containing secondary plant products such as latex.
Glossary of Plant Systematics (1st ed.) by Simpson (2006)
- Cells located in the periphery of some tissues that secrete and store latex, functioning to deter herbivory and to seal and protect plant tissue upon wounding.
- Sadava, D., Hillis, D. M., Heller, H. C. & Berenbaum, M. R. 2011. Life: The Science of Biology, 9th ed. -xliv + 1266 pp. Sinauer Associates, Inc., Sunderland.
- Simpson, M. G. 2006. Plant Systematics. -xi + 590 pp. Elsevier Academic Press, Oxford.