Features of biomorphology of homophyllous water crowfoot Ranunculuslongirostris (Batrachium, Ranunculaceae) occurring in North America were studied. From the generally similar group of the rigid-leaved water crowfoots (the R. circinatus group), R. longirostris is distinguished by the presence of a long internode before the first flower (the ratio of leaf and internode lengths is 1 : 5), persistent stipules throughout the shoot, a “true” dichotomy in the structure of inflorescences, conical nectar pits and fruits with a long persistent beaks. The latter feature distinguishes this species from the rest of the water crowfoots. An analysis of the inflorescence variants of aquatic, semiaquatic, and terrestrial Ranunculus shows that R. longirostris had initial dichasia branching that is almost unique within Batrachium, as well as an additional multiaxial structure in the lateral axes of the inflorescence which is known for some semiaquatic and terrestrial Ranunculus species. The data demonstrate the specific position of R. longirostris in Batrachium and contribute to the evidences of the close relationship between Batrachium and other Ranunculus.

中文翻译：

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北美纯净水毛foot毛an（Batrachium，毛an科）的生物形态特征

homophyllous水克劳福特的biomorphology的特点毛茛鮠（Batrachium，毛茛科）在北美发生的影响。从大致相似组刚性-阔叶水crowfoots的（对- [R 。circinatus基），- [R 。长龙其特点是在第一朵花之前存在一个较长的节间（叶与节间长度之比为1：5），整个枝条上有持久的托叶，花序结构中的“真”二分法，圆锥形的花蜜凹坑和果实，长而持久的喙。后一个特征使该物种与水the的其余部分区分开。水产，水栖和地面花序的分析变体毛茛表明，- [R 。鮠有初始dichasia分支即内几乎唯一Batrachium，以及在其中一些半水栖和地面已知花序的横向轴线的附加多轴结构毛茛种类。数据表明R的具体位置。球孢菌属中的longirostris，有助于证明球孢菌与其他毛R属之间的紧密关系。