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Bolboschoenus laticarpus Marhold, Hroudová, Zákravský & Ducháček (for which we suggest the common name Pedunculate Club-rush) is reported from the British Isles and the characters which distinguish it from B. maritimus (L.) Palla are given. The known English distribution is presented and placed in its wider geographical context. The ecology and history of this species in Britain are outlined and its likely status is considered. B. laticarpus is locally abundant and widely distributed in a range of natural and artificial habitats, particularly within the Somerset Levels and also in the flood plains of some larger rivers, where it is now known to have been long persistent. B. laticarpus appears to be a successful colonist, having arrived recently in several newly created, artificial habitats. The mode of introduction is unknown but believed to be natural, and indeed elsewhere in Europe it is reportedly increasing within its natural range, perhaps as a consequence of changes in land-use, eutrophication and potentially climate. We therefore regard it as a native taxon.

Intermediates between Schoenoplectus lacustris and S. tabernaemontani have been recognised at least since the late 19th century and for much of that time, there has been speculation that such intermediates may involve hybridisation. In 2017 the hybrid status of a population growing in the South-Forty-foot Drain in Lincolnshire was confirmed using molecular tools. This article presents information on the hybrid, both from the Lincolnshire population and from the literature, as well as providing an indication of how hybrid populations might be recognised. The binomial Schoenoplectus × flevensis (D.Bakker) Lansdown & Rumsey is proposed for the hybrid.

Additional detail is provided to validate the new combination Schoenoplectus × flevensis (D.Bakker) Lansdown & Rumsey comb. & stat. nov.

New information has extended the known range of Callitriche pulchra Schotsm. (Plantaginaceae) to Cyprus. This, combined with a survey of populations on the island of Gavdos off the S coast of Crete, shows that it is less threatened than previously thought. Updated information is presented here on the distribution, status and ecology of this species. Citation: Lansdown R. V., Kefalas K. & Bazos I. 2016: New information on the status and distribution of Callitriche pulchra (Plantaginaceae), including a first record from Cyprus. — Willdenowia 46: 379–385. doi: http://dx.doi.org/10.3372/wi.46.46306 Version of record first published online on 3 November 2016 ahead of inclusion in December 2016 issue.

In recent years, awareness has risen surrounding the crucial role of plants in providing ecosystem services and on their decline – they are one of the essential foundations of healthy ecosystems that we depend on. However, significant gaps in knowledge still remain. In this context, the European Red List of lycopods and ferns provides the first ever comprehensive assessment of the extinction risk of all native lycopod and fern species to Europe. With 194 species assessed, this assessment highlights that 19.9% of lycopod and fern species are threatened with extinction in Europe. This is mainly due to urban and infrastructure development, human intrusions and disturbance, pollution, and water use and management.

Taxonomic review is provided for taxa of Callitriche L. (Callitrichaceae) occurring in North America. One new species, C. stenoptera Lansdown, is described from Arizona in the United States, and the following names are lectotypified: C. anceps Fernald, C. drummondii Hegelmaier, C. hermaphroditica L. var. bicarpellaris (Fenley ex Jepson) H. Mason, C. longipedunculata Morong, C. marginata Torrey, C. nuttallii Torrey, C. sepulta S. Watson, and C. stenocarpa Hegelmaier.

Taxonomic review is provided for Callitriche taxa occurring in central and eastern Asia east of the Urals and in southeastern Asia north of Irian Jaya Barat. Three new species: Callitriche fuscicarpa, C. glareosa, and C. raveniana are described from Nepal, Bhutan, and Taiwan, China, respectively. Two new varieties are also described: Callitriche palustris L. var. megalata from Siberia in Russia and Callitriche palustris L. var. strumosa from western Sumatra in Indonesia. Callitriche nana is newly referred as a synonym of C. japonica Engelmann ex Hegelmaier. Callitriche oryzetorum Petrov is transferred and reduced in rank to a variety of C. palustris L. Callitriche wightiana Wallich in Wight is lectotypified.

The names described by Linnaeus in the genus Callitriche are discussed and most are newly typified. Callitriche palustris L. is recognised, with C. verna L. as a heterotypic synonym, and the current usage of C. hermaphroditica L. is maintained.