One of the mysteries of the English language finally explained.
A sheath protecting the root of a germinating grass or cereal grain.
covering, cover, case, casing, envelope, sleeve, wrapperView synonyms
- ‘The coleoptile and coleorhiza are sheaths that enclose the apical meristem of the shoot and root respectively.’
- ‘Coleoptiles and coleorhizae are found only in grasses.’
- ‘Longitudinal sections of the embryonic root showed that the structures that protect the rootlet, i.e. the root-cap and coleorhiza, were strongly labelled.’
- ‘Indeed, at the end of stage II, scutellum, coleoptile, coleorhiza, primary root primordium, and leaf primordia have already been reported to be present.’
- ‘Seminal roots do not form a coleorhiza since the scutellar node tissue is already differentiated when seminal roots emerge and can easily be penetrated.’
Mid 19th century: from koleos ‘sheath’ + rhiza ‘root’.
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