These plants do not require seeds as they produce new plants by vegetative propagation. These plants have vegetative propagules which are modified leaves/stems/roots/shoots which have nodes from which new plants arise.
Two other examples where new plants are produced by vegetative propagation are:
(i) Roots of plants like guava can form adventitious buds which can grow into new plants by placing them in the soil.
(ii) Leaves of plants like Bryophyllum can form adventitious buds which can develop into new plants while being attached to the leaf.
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