A spellingbee word:
[n] any shrub or small tree of the genus Rauwolfia having leaves in whorls and cymose flowers; yield substances used medicinally especially as emetics or purgatives or antihypertensives
[n] any of several alkaloids extracted from the shrub Rauwolfia serpentina

I thought its value was doubtful.

...yet reserpine (Serpasil ® ) was a good antihypertensive medicine in its day...