Final answer:
Dr. Harriet holds a usufructuary interest in the land via conveyance from Dr. Pharell, which grants her usage rights without traditional ownership. Conditions of the usufruct likely prevent her from selling the land and can impact her economic potential if not followed.
Step-by-step explanation:
The type of interest that Dr. Harriet holds in the land, assuming the conveyance mimics the usufruct rights typical in horticultural societies, is not one of absolute ownership, but rather a form of usufructuary interest. This means Dr. Harriet has the right to use the land and potentially harvest its fruits but does not own the land in a traditional sense. The condition attached to the usufruct is likely similar to the customs where the land must remain within the control of the family heads or village leaders. As such, Dr. Harriet would be prohibited from selling or transferring ownership of the land itself.
The implication of this condition is significant: if Dr. Harriet fails to comply with the conditions of the usufruct, such as attempting to sell the land or not using it in a manner consistent with the agreement, her right to use the property could be revoked. This limitation would have a direct impact on Dr. Harriet's ownership rights as she must adhere to specified conditions to maintain her usufructuary interest, limiting her ability to capitalize on the land's full economic potential.