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Symphyotrichum depauperatum : ウィキペディア英語版 | Symphyotrichum depauperatum
''Symphyotrichum depauperatum'', also known as the Serpentine aster, is a rare species of aster adapted to serpentine barrens, an ecosystem with a high concentration of toxic metals in the soil.〔(Flora of North America, ''Symphyotrichum depauperatum'' (Fernald) G. L. Nesom, 1995. Starved or serpentine aster )〕 ''Symphyotrichum depauperatum'' is a perennial herb up to 50 cm (20 inches) tall, with 1-3 stems. Leaves are narrow, generally 2-4 cm (0.8-1.6 inches) long. The plant produces numerous flower heads in branched arrays, each head with 7–14 white or pink ray flowers surrounding 7–17 yellow disc flowers.〔 ==Distribution== ''Symphyotrichum depauperatum'' grows in 20 of the 26 serpentine barrens in the east-central United States (Pennsylvania, Maryland, Virginia, North Carolina),〔(Biota of North America Program 2014 county distribution map )〕 and has been called a "flagship" species of this unique ecosystem. It was previously thought to be endemic to these barrens, but it was recently confirmed to also occur in a disjoint population on diabase glades in North Carolina.〔(Danny J. Gustafson, Roger Earl Latham, "Is the serpentine aster, ''Symphyotrichum depauperatum'' (Fern.) Nesom, a valid species and actually endemic to eastern serpentine barrens?", ''Biodiversity and Conservation'', Vol. 14, No. 6 (Jun 2005). )〕
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