A kind of sheath formed by two stipules united round a stem.
A sheath at the base of the leaf forming a tube around the stem (plural ochreae) (especially KNOTRASSES, POLYGONUM SPP.).
The sheath around the base of the seta.
Sheathing stipules as in the Polygonaceae.
a sheath, formed from two stipules, encircling the node in Polygonaceae.