coleorhizan.
/ˌkɒliːəʊˈrʌɪzə/ Botany.
The sheath enveloping the radicle or rudimentary root in the embryo of grasses and other phanerogams; the root-sheath.
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sheath-scale1796
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coleorhiza1866
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lemma1906
1866 in J. Lindley & T. Moore Treasury Bot.
1880 A. Gray Struct. Bot. ii. 26 The radicle is completely enclosed by..a peculiar sheath..named the Coleorhiza.
1882 S. H. Vines tr. J. von Sachs Text-bk. Bot. (ed. 2) 638 In Ranunculus Ficaria, a tuberous lateral root is produced below the primary axis of the embryo, sheathed by a coleorhiza.
This entry has not yet been fully updated (first published 1891; most recently modified version published online June 2018).
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n.1866