''Marshallia graminifolia'' is a

perennial A perennial plant or simply perennial is a plant that lives more than two years. The term ('' per-'' + '' -ennial'', "through the years") is often used to differentiate a plant from shorter-lived annuals and biennials. The term is also wid ...

herb species,

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found else ...

to the coastal plains of the

Southern United States The Southern United States (sometimes Dixie, also referred to as the Southern States, the American South, the Southland, or simply the South) is a geographic and cultural region of the United States of America. It is between the Atlantic Ocean ...

, where it often grows in bogs and in sunny locations. Like all species in the genus ''Marshallia'', it has the common name Barbara's buttons, and is specifically known as grassleaf Barbara's buttons. ''M. graminifolia'' has two accepted subspecies, ''M. graminifolia'' subsp. ''graminifolia'', and ''M. graminifolia'' subsp. ''tenuifolia'' (commonly known as narrowleaf Barbara's buttons or slim leaf Barbara's buttons). ''M. graminifolia'' subsp. ''tenuifolia'' grows in moist sandy habitats, such as bogs, wet savannahs and low pine woods in the south-east coastal areas of the United States, from the south coast of Georgia along the gulf coast into east Texas. It has a deep taproot, lavender to white flowers and an achene fruit. The disc shaped flowers are fragrant.
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References

{{Taxonbar, from=Q15548217 Helenieae Endemic flora of the United States Flora of Alabama Flora of Florida Flora of Georgia (U.S. state) Threatened flora of the United States Flora without expected TNC conservation status