Webster's incomplete, again. I'll try and keep puns out of this.

1. a rod with the name of Aaron written in it. Itmiraculously came into existence and gave almonds. (See Numbers 7:8 The rod was a snake before (Numbers 7:10)
2. any of the various plants with a tall, flowering stem, such as the goldenrod or mullein.
3. a smooth-stemmed herb. Thermopsis caroliniana found from North Carolina to Georgia. It has yellow flowers and in stiff, erect groups and hoary pods.
4. a convex molding having evenly spaced leaves or scrolls.