Step 1: Understanding the Concept:
An interspecific hybrid is an offspring resulting from the cross-breeding of two different species within the same genus.
Step 2: Detailed Explanation:
- Eucalyptus grandis and Eucalyptus urophylla are distinct species within the genus Eucalyptus.
- Their hybrid, Eucalyptus grandis \(\times\) E. urophylla, is a widely cultivated commercial hybrid in forestry. It exhibits strong hybrid vigor (heterosis) and combines the fast growth of E. grandis with the wood density and disease resistance of E. urophylla.
- Teak Teli is a naturally occurring variant within the single species Tectona grandis.
- The Nilambur \(\times\) Chandrapur cross is an intraspecific cross within Tectona grandis.
- Jatropha curcas and Ricinus communis belong to different genera, representing an intergeneric combination, which is generally incompatible.
Step 3: Final Answer:
The correct example of an interspecific hybrid is Eucalyptus grandis \(\times\) E. urophylla.