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The large whorled pogonia orchid
(Isotria verticillata) grows in the wet, sandy forests and bogs of E. Texas.
A hollow, purplish stem grows from a rhizome and ends in a whorl of five leaves,
above which grows a single brown-purple and yellowish-green unscented flower displayed like
a pinwheel. This perennial does not necessarily bloom every year.
When it does, it starts in late March and flowers through August. The flowers
last less than a week.
Having seen them only under or near beech trees indicates a dependent relationship
with the trees and with related fungi. Found in the Big Thicket, particularly in
the Beech Creek Unit in Tyler Co. and surrounding counties, it can form good-size
patches with multiple stems growing out of the same rhizome.
Isotria is related to Pogonia and is comprized of only two species, the
other being I. medeoloides, the endangered 'Small Whorled Pogonia'. When
not flowering, young plants of Indian cucumber-root can be mistaken for
the small whorled pogonia which does not survive in cultivation.
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