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For example, Viburnum x bodnantense is a cross between the two spiecies Viburnum farreri and Viburnum grandiflorum. However, there are some crosses between species from different genera, for example the very vigorous x Cupressocyparis leylandii, which is a cross between the genera Chamaecyparis and Cupressus.
 Hybridisation and selection have produced many cultivars with similar characteristics. For convenience these are often classified into groups or series, for example Delphinium Pacific Hybrids or Elatum Group.
Name ChangesSometimes it is necessary to change a plant name, which can be very confusing for gardeners. There are several reasons for this. The plant may have been wrongly identified or an earlier name for it may have been found, in which case the International Code specifies the earliest name should be used. Another reason is that two different plants may have been given the same name. |
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The reason it is important to know the correct name of a plant is that two different species from the same genus may be very different from one another.
For example, take the spurge family (Euphorbia). These plants have unusual blooms and good foliage and make excellent plants for creating decorative effects or background foliage in the garden.
But you do have to choose the right one. Euphorbia wulfenii is a large, shrubby very hardy plant, which forms a loose dome of large yellow flower heads and grows to 1.5m (5ft) tall. It is a splendid plant for creating an architectural effect, whereas Euphorbia myrsinites is only 15cm (6in) high and Euphorbia obesa is a tender ball-shaped succulent requiring greenhouse cultivation.
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