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Phylum Coniferophyta (or Pinophyta) -- conifers
Coniferophyta comprise a very large phylum of great economic
importance. Pinus (pine) is surely its most famous and
economically beneficial genus. Numerous genera of conifers can
be found in central Texas both growing natively and horticulturally.
Of particular note is Juniperus (cedar or red cedar) which
causes large-scale allergic reactions among people. (Pollen and
seed are produced on different individuals and it is pollen trees
that cause human allergies.)
Conifers are heterosporous and, in addition, produce highly
specialized, complex reproductive and dispersal structures called
seeds. Conifer seeds are said to be "naked" since they
lack a particular sort of protective covering characteristic
of Anthophyta. Coniferophyta are therefore said to be "gymnospermous."
Genus Pinus
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