Not all parts below ground level are roots. Sometimes a part of the plant body is in the ground too, tapering more or less continuously into the root. Some species like C. vau-peliana, C. wohlschlageri or C. pulleineana develop a significant "neck" between the tuberous root and the body (see Fig. 5). When cultivated, the root is often deformed. It is generally not permitted to remove plants from their habitat and, therefore, it has become difficult to give an exact description of the root structure of a species. Technical terms for the roots are: fibrous roots, sprouting root, tuberous root.
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