Thanks, Masato. I went ahead and downloaded SmartViewer (actually, I downloaded it to the church's computer without telling them) and sure enough, there it is, words and music both just the way M. Praetorius wrote it in the Book of Isaiah, under contract to the Roman Catholic Diocese of Ponce, PR. ;-) I'll put it in my online hymnal sometime before Advent.

For those who may care, here's the text:

FLOS DE RADICE JESSE
(A Flower from Jesse's Root)

1. Flos de radice Jesse | est natus hodie.
   Quem nobis jam adesse | laetamur unice.
         Flos ille Jesus est.
   Maria Virgo radix de qua flos ortus est.



2. Hunc Isaias florem | praesagiis cecinit.
   Ad ejus nos amorem | Nascentis allicit.
         Flos virgam superat
   coeli terraeque cives, Flos ille recreat.



3. Est campi flos pudici, | est flos convallium.
   Pulcrumque potest dici | in spinis lilium.
         Odoris optimi;
   vel soli quodvis cedit aroma nomini.



4. Hic suo flos odore | fideles attrahit.
   Divino mox amore | attractos imbuit.
         O flos o gratia:
   ad te suspiro, de te me satia.

Haruo