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・ Helianthus decapetalus
・ Helianthus deserticola
・ Helianthus dissectifolius
・ Helianthus divaricatus
・ Helianthus eggertii
・ Helianthus exilis
・ Helianthus floridanus
・ Helianthus giganteus
・ Helianthus glaucophyllus
・ Helianthus gracilentus
・ Helianthus grosseserratus
・ Helianthus heterophyllus
・ Helianthus hirsutus
・ Helianthus III (yacht)
・ Helianthus laciniatus
Helianthus laevigatus
・ Helianthus longifolius
・ Helianthus maximiliani
・ Helianthus membranifolius
・ Helianthus microcephalus
・ Helianthus mollis
・ Helianthus navarri
・ Helianthus neglectus
・ Helianthus niveus
・ Helianthus nuttallii
・ Helianthus occidentalis
・ Helianthus paradoxus
・ Helianthus pauciflorus
・ Helianthus petiolaris
・ Helianthus porteri


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Helianthus laevigatus : ウィキペディア英語版
Helianthus laevigatus

''Helianthus laevigatus'' is a North American species of sunflower known by the common name smooth sunflower. It is native to the east-central and southeastern United States from Georgia to Maryland.〔(Biota of North America Program 2014 county distribution map )〕
''Helianthus laevigatus'' is a perennial herb up to 220 cm (over 7 feet) tall, spreading by means of underground rhizomes. Most of the leaves are on the stem rather than crowded around the base, each leaf up to 15 cm (6 inches) long. Leaves and stems generally have no hairs, and the undersides of the leaves sometimes appear pale because of a layer of wax on the surface. One plant usually produces 1-6 flower heads. Each head has 5-10 yellow ray florets surrounding 40 or more yellow disc florets. The plant grows soils derived from shale.〔(Flora of North America, ''Helianthus laevigatus'' Torrey & A. Gray, 1842. Smooth sunflower )〕〔(Carl S. Keener 1983. Distribution and biohistory of the endemic flora of the mid-Appalachian shale barrens. Botanical Review 49:65-115 )〕
==References==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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