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Helenium vernale : ウィキペディア英語版 | Helenium vernale
''Helenium vernale'' is a North American species of flowering plant in the aster family known by the common name Savanna sneezeweed or spring sneezeweed. It is native to the southeastern United States, from Louisiana to the Carolinas.〔(Biota of North America Program 2014 county distribution map )〕 ''Helenium vernale'' is a perennial herb up to 80 cm (32 inches) tall, with small wings running down the sides of the stem. One plant generally produces only 1–3 hemispherical flower heads, each on its own flower stalk. Each head can contain up to 800 minuscule disc flowers, each 4.6–6.0 mm (0.184-0.240 inches) across, yellow at the base, yellow or yellow-brown near the tips. There are also 13–30 yellow ray flowers.〔(Flora of North America, ''Helenium vernale'' Walter, 1788. Savanna or spring sneezeweed )〕 ==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Helenium vernale」の詳細全文を読む
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