Whether this plant is toxic or not needs to be determined according to the specific situation. Generally speaking, stab wounds may cause local infection and foreign body embedding, and corresponding treatment measures need to be taken.

If the finger is swollen after being stabbed by spiny plants, the following measures can be taken:

1. Local infection: It may be caused by bacterial invasion. It is suggested that disinfectants and ointments should be used reasonably, and cold compress should be considered to control swelling.

2. Foreign body embedding: It is recommended to go to the hospital for treatment in time. Doctors should take out foreign bodies through sterile instruments and use disinfection drugs reasonably for treatment. If it cannot be taken out, it needs surgical incision, drainage and debridement.

Pay attention to local cleanliness and hygiene in daily life to avoid infection. If the symptoms such as finger swelling and pain persist or worsen, it is recommended to go to the hospital in time.