Glossary
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- Raceme
- An inflorescence type in which all the spikelets are pedicellate on the rachis.
- Racemose
- Branches that are like racemes; with some combination of sessile and short pedicellate spikelets.
- Rachilla
- The axis of the spikelet; the structure to which the glumes, lemma and floral axis are attached.
- Rachis
- The axis of a spike, spicate raceme, or raceme inflorescence.
- Range Condition
- The current productivity of rangelands relative to that land's natural productivity.
- Reduced
- Smaller in size, frequently lacking parts; in flowers the sexual parts may be absent.
- Reduced floret
- A floret that is either staminate or neuter. If it is highly reduced (e.g. awnlike structures) then it is sometimes called a rudimentary floret.
- Reflexed
- Bent downward or backward from the apex.
- Resaca
- An old river bed, e.g. and ox-bow.
- Resinous
- Producing a viscous substance or resin.
- Reticulate
- In the form of a network like some types of netted venation.
- Retrorse
- Pointing downward toward the base, as do the barbs on Cenchrus (sandbur).
- Revolute
- Turned under along the margins toward the abaxial surface.
- Rhizome
- A horizontal, underground stem with modified leaves at the nodes.
- Rhizomatous
- Having rhizomes; horizontal underground stems with nodes and internodes.
- Rosette
- A cluster of spreading or radiating basal leaves, as in Dichanthelium.
- Rounded
- Having an arched apex rather than a pointed and angled apex.
- Rudiment
- An imperfectly developed organ or part, specifically used in reference to florets. The rudiment of a spikelet is formed by structures of a reduced sterile floret.
- Rudimentary
- Not fully developed and non-functional.
- Rugose
- Wrinkled or folded; having horizontal folds in the surface.