The Verbenaceae is a large family with up to
98 genera and about 2600 species. These are distributed
worldwide, but with a concentration in
tropical and subtropical regions. Only one genus
occurs in Western Europe, Verbena officinalis.
One term, already used in previous parts of
the NEPF is of special interest here. Its
definition is as follows:
H-endoaperture: A composite endoaperture,
consisting of a central part which connects two
lateral, longitudinally elongated extensions
(arms), thus forming an H
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