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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.