Distribution of Amaranthus graecizans L., a newly naturalized species in China and its relationship with Amaranthus roxburghianus Kung
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摘要: 本文报道了中国苋科苋属的一新记录归化植物——广布苋（Amaranthus graecizans L.）。该种植株常匍匐，叶片狭长椭圆形至线状披针形，有时线形或菱形卵形，长至少为宽的2.5倍，花被片3枚，近等长，与中国有分布的本属其他物种有所区别。该种原产于欧洲地中海地区、非洲北部至亚洲西部，归化于欧洲其他地区、东亚、澳大利亚、北美洲以及我国的河南、河北和山东等地区。该种易与苋属其他种类相混淆，因此其在我国的分布区可能被低估。此外，本文还对该种的种下等级以及该种的相似种进行了区分，并对该种下亚种Amaranthus graecizans subsp.thellungianus（Nevski） Gusev与国内文献记载的腋花苋（Amaranthus roxburghianus Kung）之间的关系作了说明与澄清。Abstract: Amaranthus graecizans L. (Amaranthaceae) is reported as a newly recorded naturalized plant in China. The species often exhibits a prostrate habit and is characterized by leaf-blade (particularly larger leaves of main stem) at least 2.5 times as long as broad, narrowly oblong to linear-lanceolate, perianth segments 3, equal or subequal, which is distinct from other Amaranthus species distributed in China. It is native to the Mediterranean region of Europe, northern Africa, and West Asia, and is naturalized in other parts of Europe, East Asia, and Australia, as well as Henan, Hebei, and Shandong provinces of China. This species is easily confused with other species of Amaranthus, so its distribution area in China may be underestimated. Subspecies of Amaranthus graecizans L. and similar species are distinguished here. The relationship between Amaranthus graecizans subsp. thellungianus (Nevski) Gusev and Amaranthus roxburghianus Kung recorded in domestic literature is explained and clarified.
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