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[Richard Jensen]

Well, let's consider this.  I have a group of species some of which have
leaves densely pubescent on the abaxial surface and some of which are
distinctly obtrullate in outline.  Only one species has both characters,
so I argue that the following is a good couplet:

        A. Leaves obtrullate and densely pubescent abaxially.....species X
        A. Leaves not as above

Yes, I could construct a key with species X keyed under both
"characters," but the above couplet simplifies the key.

Richard J. Jensen      |   E-MAIL: rjensen at saintmarys.edu
Dept. of Biology       |   TELEPHONE: 219-284-4674
Saint Mary's College   |   FAX: 219-284-4716
Notre Dame, IN  46556  |