Webster's English Dictionary

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stemma

stem.ma \'stem-*\ \-*t-*\ n or stem.ma.ta [L, wreath, pedigree (fr. the 
   wreaths placed on ancestral images), fr. Gk, wrea] pl th, fr. stephein to 
   crown, enwreath 1: a scroll (as among the ancient Romans) containing a list 
   of family names  with indication of genealogical relations 2: a tree 
   showing the relationships of the manuscripts of a literary work