Sandalwood tree is considered a :

Sandalwood (Santalum album) is scientifically classified as a partial root parasite, also known as a root hemiparasite [1][t2]. Unlike holoparasites (total parasites) that lack chlorophyll and depend entirely on their host for carbon, sandalwood is photosynthetically competent and possesses green leaves to produce its own food [t2]. However, it is an obligate parasite that must establish haustorial connections with the roots of neighboring host plants to acquire essential water and inorganic nutrients like nitrogen and phosphorus [t1][t2]. This parasitic relationship is critical during its initial growth phase and throughout its life cycle to ensure survival and optimal development [t1][t7]. The tree's roots invade the root systems of host species, such as Cajanus cajan, to steal these resources while maintaining its own photosynthetic capacity [t2][t7].

Sources

1. [1] Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 13: Plant Diversity of India > 8.7.6. Other characters > p. 206