Phylotaxis or Phyllotaxis: How To spell?
The word Phylotaxis is misspelled against Phyllotaxis, a noun meaning "The order or arrangement of leaves on the stem; the science of the relative position of leaves."
Phyllotaxis has double "ll" is mispronounced as "l"Remember double 'LL' in between the strings phy & otaxis which should not be misspelled with single 'L'
Wrong Spelling:  phy-l-otaxis  Correct Spelling:  phy-ll-otaxis 
Find more incorrect spellings of Phyllotaxis to spell right way.