Seeds of the extant Urtica kioviensis Rogow. (Urticaceae) and endocarps of the extinct Potamogeton sukaczevii Wieliczk. (Potamogetonaceae) were recorded in diverse plant macrofossil assemblages recovered from organic sediments exposed during excavations at Saham Toney, Norfolk, UK. Aminostratigraphical data show the sediments were deposited during the Ipswichian (Last Interglacial) Stage. Palynological data indicates deposition during the Carpinus pollen zone of the Ipswichian Stage—the latter part of pollen zone Ip IIb and Ip III. The records are noteworthy not only because they are the first in the British Pleistocene but also because of the geographical occurrences of these two species. Urtica kioviensis is absent from the British flora today and has a modern range in central and eastern Europe (only extending as far west as north–east Germany and Denmark), while the extinct Potamogeton sukaczevii has only been recovered from Late Pleistocene sediments in Belarus, Lithuania, Poland and western Russia. The presence of U. kioviensis along with other exotic species to the British Isles (e.g. Najas minor L. and Salvinia natans L., which today have central and southern ranges in Europe and in the case of S. natans occurs on other continents) may point to more continental conditions or warmer summer conditions during the second half of the Ipswichian Stage in southern Britain. No modern analogues occur in Britain for the assemblages recovered from Saham Toney. Evidence of colder winters or at least warmer summers at the time of deposition does not support the view that sea-level peaked in the Carpinus zone of the Eemian Stage (correlated with the Ipswichian Stage) associated with increased oceanicity. Southern Britain would have been under the influence of the Atlantic Ocean and a degree of oceanicity is supported by the presence of two thermophilous taxa, Hedera and Ilex, in the pollen spectra from Saham Toney. Alternative explanations for the presence of these exotic species are that they were tolerating mild winters and cooler summers at the time of deposition or exploiting suitable micro-environments. The distribution of P. sukaczevii is probably an artefact of the distribution of expertise in the identification of Potamogeton fossil endocarps rather than having any palaeogeographic or palaeoclimatic significance. It is an extinct ancestor of the extant P. maackianus A. Benn, an eastern Asian pondweed. Its discovery in Britain encourages a reassessment of plant macrofossil assemblages from western Europe, which may lead to a consideration of the relationship between the Late Pleistocene vegetation of Europe and eastern Asia.

中文翻译：

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Urtica kioviensis Rogow的第一个更新世化石记录。（荨麻科）和Potamogeton sukaczevii Wieliczk。（Potamogetonaceae）在不列颠群岛。

现存的荨麻科罗非鱼的种子。（荨麻科）和灭绝的Potamogeton sukaczevii Wieliczk的内果皮。在英国诺福克郡萨哈姆·托尼（Saham Toney）的挖掘过程中，从暴露于有机沉积物中的各种植物大型化石组合中记录了（马铃薯）。氨基地层数据表明，沉积物是在伊普斯维奇（末次冰期）阶段沉积的。孢粉学数据表明，在伊普斯维奇期的Carpinus花粉区（花粉区Ip IIb和Ip III的后期）沉积。这些记录是值得注意的，不仅因为它们是不列颠更新世的第一个记录，而且还因为这两个物种的地理分布。菊科荨麻如今已不在英国的植物区系中，并且在中欧和东欧具有现代分布范围（仅向西延伸至德国东北部和丹麦），而绝种的Potamogeton sukaczevii只能从白俄罗斯，立陶宛，波兰和俄罗斯西部。的存在U. kioviensis与其他外来物种英伦三岛一起（如小茨藻属和槐叶萍L.，今天有中部和南部的范围在欧洲和的情况下槐叶萍发生在其他大洲）可能表明在英国南部伊普斯维奇期的后半期出现了更多的大陆条件或夏季温暖的条件。从萨汉姆·托尼（Saham Toney）回收的枪身在英国没有现代类似物出现。沉积时较冷的冬天或至少较温暖的夏天的证据不支持这样的观点，即海平面上升到与大洋性有关的Eemian期Carpinus带（与Ipswichian期相关）。英国南部本来会受到大西洋的影响，并且有两个嗜热的类群，Hedera和Ilex，支持了一定程度的海洋性，来自Saham Toney的花粉光谱中。对于这些外来物种的存在的另一种解释是，它们在沉积或开发合适的微环境时可以忍受温和的冬季和凉爽的夏季。sukaczevii的分布可能是鉴定Potamogeton化石内果皮的专业知识分布的产物，而不具有任何古地理或古气候意义。它是现存P. maackianus的灭绝祖先东亚杂草丛生的本。它在英国的发现鼓励重新评估来自西欧的植物大化石组合，这可能导致人们考虑欧洲晚更新世植被与东亚之间的关系。