ClipArt ETC
<i>Ecballium elaterium</i>. "A vessel which is usually long, with fusiform extremities, and has the walls thickened in a spiral manner with one or more simple simple or branched bands or fibers. In most cases the direction of the spiral is from right to left, but it frequently happens that the earlier formed spirals run in one direction, while those formed later run in an opposite direction." &mdash;Whitney, 1889

Spiral Vessels or Ducts of the Squirting Cucumber

Ecballium elaterium. "A vessel which is usually long, with fusiform extremities, and has the walls thickened…

"Longitudinal section of an open fibro-vascular bundle. c, cambium; s, spiral vessels with fibers which can be unrolled; l, scalariorm reticulated vessel; h, h', h'', h''', wood-cells; t, bordered pitted vessel; t', young pitted vessel; p, inner phloem layer; b, best layer; gs, bundle-sheath; r, cortical parenchyms; m, pith parenchyms. The elements are developed from s to t' in the xylem portion." &mdash; Encyclopedia Britanica, 1893

Fibro-vascular Bundle

"Longitudinal section of an open fibro-vascular bundle. c, cambium; s, spiral vessels with fibers which…