Answer : 4. "रोहिड़ा"
Explanation :

Some endangered plant species found in India are the Ebony tree (Diospyros celibica), Bird`s foot (Lotus corniculatus), Assam catkin yew (Amentotaxus assamica), Malabar Lily (Clorophytum malabaricum) and Musli (Chlorophytum tuberosum).