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Helianthemum
''Helianthemum'' ,〔''Sunset Western Garden Book''. 1995. 606–07.〕 known as rock rose, sunrose, rushrose, or frostweed,〔(''Helianthemum''. ) Integrated Taxonomic Information System (ITIS).〕 is a genus of about 110〔(''Helianthemum''. ) Flora of China.〕 species of flowering plants in the family Cistaceae. They are widely distributed throughout the Northern Hemisphere, especially in the Mediterranean.〔 There are New World species, but it has been proposed that these be transferred to genus ''Crocanthemum''.〔Sorrie, B. A. (2011). (Transfer of North American ''Helianthemum'' to ''Crocanthemum'' (Cistaceae): New combinations. ) ''Phytologia'' 93(2), 270-71.〕
==Description==
These are usually shrubs or subshrubs, and some are annual or perennial herbs. The leaves are oppositely arranged, but some plants may have alternately arranged leaves along the upper stems. The flowers are solitary or borne in an array of inflorescence types, such as panicles, racemes, or headlike clusters. The flower has three inner sepals and two smaller outer sepals. It has five petals usually in shades of yellow, orange, or pink. The style at the center is tipped with a large stigma. The fruit is a capsule containing many seeds.〔
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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