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Black Root or Rabbit Tobacco

Pterocaulon pycnostachyum (Michx.) Elliott

(ter-o-CALL-on  pik-no-STAK-ee-um)

syn. P. undulatum C. Mohr

General:

A common perennial, Black Root’s generic name means “winged stem.”  The winged stems are covered with soft white hairs as are the clasping leaves.  The species name refers to the thick flower spike.  It gets its common name from its thick, black, tuberous root.   The other name, Rabbit Tobacco, comes from its use as a tobacco substitute.

In folk medicine, the boiled root was used to make “tea” to relieve backache, and combined with Aralia it is said to have helped treat colds, asthma and ladies’ problems.

Flowers/Fruit:

The tiny tubular flowers form terminal flower heads.  The droopy clusters are creamy white and turn woolly as they mature.
The very small seeds are reddish brown and hairy.

Leaves/Stems:


The sessile (stemless) leaves seem to be a continuation of the winged stems.  They are smooth on top with a white midrib on the green leaf.  The lanceolate (long, narrow) leaves are covered below with soft, white hairs.

The stems, to 6 dm. (2 ft.) high, have flat wings covered with soft, silvery hairs.

Distribution:

Found in flatwoods and disturbed sites throughout the peninsula of Florida, it ranges up the coastal plain to North Carolina.


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