Alysum or Alyssum: How To spell?
The word Alysum is misspelled against Alyssum, a noun meaning "A genus of cruciferous plants; madwort. The sweet alyssum (A. maritimum), cultivated for bouquets, bears small, white, sweet-scented flowers."
Alyssum has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings aly & um which should not be misspelled with single 'S'
Wrong Spelling:  aly-s-um  Correct Spelling:  aly-ss-um 
Check more misspelled words of Alyssum to spell it correct.