Casia or Cassia: How To spell?
The word Casia is misspelled against Cassia, a noun meaning "A genus of leguminous plants (herbs, shrubs, or trees) of many species, most of which have purgative qualities. The leaves of several species furnish the senna used in medicine."
Cassia has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings ca & ia which should not be misspelled with single 'S'
Wrong Spelling:  ca-s-ia  Correct Spelling:  ca-ss-ia 
Find more wrongly spelled words of Cassia to spell it well.