Category: R

Plant with roots that are perennial but stems or shoots that are annual [unusual term].  

Soil bacterium that fixes nitrogen and has an association with a plant.  

Sub-umbellate cluster, fan-shaped cyme, the lateral branches developing in one plane, alternately in opposite directions, with the main axis appearing zig-zag (mainly in Iridaceae).  

Plant adapted to fast-flowing water, usually with long slender leaves.  

Ridge of tissue connecting the base of the nucellus with the placenta. The prolongation of a seed stalk along the side of an ovule.  

Axis of grass spikelet; rachilla is the preferred spelling.  

Plural of rhachis.  

Rolled or curled over backwards, towards the abaxial surface. The margin rolled toward the lower side of the blade. Rolled backward; usually said of margins of organs or their extremities (both phases are apparent in the petals).  

A taxonomic study of a group of taxa. An examination of a surgical operation after it has been carried out.  

Notched, with a rounded indentation (usually said of an apex). So blunt at the apex as to be slightly indented.