Giant Barbara's button is found along scoured riverbanks and in bogs in the Mid-Atlantic region. It produces frilly pink or lavender tubular flowers with blue anthers in June and July. (PDCNR 2002) This rare species is found in only 11 watersheds in the Appalachians and the Cumberland Plateau, and in jeopardy throughout its natural range. It is listed as endangered in the states of Pennsylvania, Kentucky, and Tennessee, and threatened in West Virginia. All historically known populations in North Carolina and Maryland are now extinct due to the destruction of the bog where populations were known to exist. (PDCNR 2002) These plants require disturbance from periodic flooding to avoid crowding from shrubs and grasses. As a result, flood control and watershed alteration poses the largest threat to the survival of this species.
|Authority||Beadle & F.E. Boynt.|
|Common Names||giant Barbara's button | large-flowered Barbara's-buttons | large-flowered marshallia | Monongahela Barbara's-buttons|
|Associated Scientific Names||Marshallia grandiflora|
|Distribution||M. grandiflora is found in Kentucky, Maryland, Pennsylvania, Tennessee and West Virginia. The largest populations are found in West Virginia. (NatureServe 2001)|
|Tennessee Valley Authority||S|
Crevices of flood-scoured rock shelves and cobble/sand riverbanks and historically known to grow in bogs. (NatureServe 2001)
Along the Gauley River in W.VA. it is found with species from the tall grass prairie. In Tennessee it is often found with Conradina verticillata. In the West Virginia/Pennsylvania region it is associated with several species including: Rhododendron arborescens, Platanus occidentalis, Salix spp., Tratbetteris caroliniensis, Liatris spicata, Houstonia caerulea, Lyonia ligustrina, Physocarpus opulifolius, Aster linariifolius, Sangusorba canadensis, Andropogon geradii, Zigadenus leimanthoides, Solidago spathulata spp. Randii var. racemosa, Oxypolis rigidior and Allium cemuum.
|Common Name||Name in Text||Association Type||Source|
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