Radix (botanica)
Radix in tracheiophytis est pars sati quae plerumque sub superficie soli iacet, ex eo aquam salesque minerales absorbens.

Cambium vasculare
Pedologia
Ramus (arbor)

Bibliographia
Baldocchi, Dennis D., et Liukang Xu. 2007. What limits evaporation from Mediterranean oak woodlands: The supply of moisture in the soil, physiological control by plants or the demand by the atmosphere? [Periodicum ignotum] 30(10).
Brundrett, M. C. 2002. Coevolution of roots and mycorrhizas of land plants. New phytologist 154(2):275–304. DOI. Abstractum. Textus (HTML). Textus (PDF).
Chen, R., E. Rosen, et P. H. Masson. 1999. Gravitropism in Higher Plants. Plant Physiology 120(2):343–350. Textus (HTML).  Textus (PDF).
Clark, Lynn. 2004. Primary Root Structure and Development. Acroasis.
Coutts, M. P. 1987. Developmental processes in tree root systems. Canadian Journal of Forest Research 17:761–767.
Phillips, W. S. 1963. Depth of roots in soil. Ecology 44(2):424.
Raven, J. A., et D. Edwards. 2001. Roots: evolutionary origins and biogeochemical significance. Journal of Experimental Botany 52(Suppl 1):381–401.  Abstractum. Textus (HTML). Textus (PDF).
Schenk, H. J., et R. B. Jackson. 2002. The global biogeography of roots. Ecological Monographs 72(3):311–328.
Sutton, R. F., et R. W. Tinus. 1983. Root and root system terminology. ''Forest Science Monograph 24, p. 137.

Radices plantarum