This is an illustration of raphide from an Arum, contained in a large cell.

Raphides

This is an illustration of raphide from an Arum, contained in a large cell.

"Cells of Rumex c, containing raphides r. The cells are called Raphidian. The raphides are acicular or needle-like crystals forming bundles." — Encyclopedia Britanica, 1893

Rumex

"Cells of Rumex c, containing raphides r. The cells are called Raphidian. The raphides are acicular…