Sena or Senna: How To spell?
The word Sena is misspelled against Senna, a noun meaning "The leaves of several leguminous plants of the genus Cassia. (C. acutifolia, C. angustifolia, etc.). They constitute a valuable but nauseous cathartic medicine."
Senna has double "nn" is mispronounced as "n"Remember double 'NN' in between the strings se & a which should not be misspelled with single 'N'
Wrong Spelling:  se-n-a  Correct Spelling:  se-nn-a 
Explore spell check of Senna to spell without errors.