- radiation
- The process of emitting energy in the form of waves or particles
- ramet
- The smallest unit of a genet that may achieve physiological independence, usually a shoot with its associated roots.
- refugium
- (a) A place that provides shelter or protection
(b) Geographical area which has remained isolated from, or unaltered by, climatic or other changes affecting surrounding regions, and that therefore provides a haven for relict species or populations
- rendzic
- Having a mollic horizon which contains or immediately overlies calcareous materials containing more than 40% calcium carbonate equivalent (in Leptosols only) (Definition after World Reference Base for Soil Resources (1998))
- rock glacier
- A mass of rock fragments and finer material on a slope that contains either interstitial ice or an ice core and shows evidence of past or present movement
- ruderal
- Occurring on disturbed habitats, commonly on raw, undeveloped soils
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