[1] : The Collaborative International Dictionary of English v.0.48

yaupon \yau"pon\, n. bot.
   a shrub ilex cassine of the holly family, native from
   virginia to florida. the smooth elliptical leaves are used as
   a substitute for tea, and were formerly used in preparing the
   black drink of the indians of north carolina. called also
   south-sea tea. written also yapon, youpon, and
   yupon.
   1913 webster
see also:
ilex cassine black drink south-sea tea yapon youpon yupon 

[2] : The Collaborative International Dictionary of English v.0.48

youpon \you"pon\, n. bot.
   same as yaupon.
   1913 webster
see also:
yaupon 

Youpon >> Y Words
Youpon, definition of term: Youpon
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