adventitious roots -- A root that grows from somewhere other than the primary root, for example, roots that arise from stems or leaves.
1. Adventitious roots - such as in palms. These are fibrous and easily moved when small.
2. Tap roots - such as in many eucalypts. These tend to be well-developed on plants grown in light sandy soils, which makes them difficult to move.
acrodromous: with veins curving towards the apex actinodromous venation: a leaf vein pattern with 3 or more primary veins diverging radially from a single point actinomorphic: radially symmetrical on a single plane adventitious roots: ...
Layering a stem down and pegging it to the soil produces adventitious roots.
An aerial root above ground is an example of adventitious roots. Ivy uses these roots for climbing.
Roots coming from bulbs, corms, rhizomes, or tubers are adventitious roots, as are roots developed from aerial stems (stolons and runners) and cuttings from stems or leaves. Rhizophora mangle (red mangrove), Pandanus spp. (screw-pine), and Ficus spp.
layering A method of stimulating adventitious roots to form on a stem. There are two primary methods of layering. In ground layering, a low-growing branch is bent to the ground and covered with soil.
LAYERING: a method of propagation in which adventitious roots form before the new plant is severed from the parent plant.
Once these adventitious roots establish in the soil, the runners begin to dry up and shrivel away. For this reason, using strawberry plant runners for propagation makes it especially easy to make more plants.
Tomatoes develop adventitious roots—roots that originate from the buried stem. A bigger and broader root system helps the plant support a heavy load of fruit.
 See also: Plant, Adventitious root, Adventitious, Water, Growing
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