Samits are the sticks with which ahutis are given during the yajnas. It is one of the homadrvyas.
The respective samits for the navagrahas are
Surya - arka - Calotropis gigantea
Chandra - palasa - Butea monosperma
Angaraka - khadira - Acacia catechu
Budha - apamarga - Achyranthes aspera
Guru - asvatha - Ficus religiosa
Sukra - oudumbara - Ficus racemosa
Sani - samee - Polygonatum verticillatum
Rahu - Durva - Cynodone dactylone
Ketu - kusa - Desmostachya bipinnata