Equisetum pratense (Shady Horsetail)
An evergreen herb, typically found on sloping sites where the substrate is derived from calcareous alluvial silts or sand, especially lightly wooded stream banks in the lower parts of upland valleys. It can also extend onto open moorland, and is found on grassy slopes beneath base-rich upland cliffs. 0-915 m (Breadalbanes, Mid Perth).
The considerable increase in records since the 1962 Atlas is due to better recording. Although most populations are long-lived, cone production is usually very poor, possibly because of climatic conditions, and Page (1997) suggests that the species is in slow decline.
Circumpolar Boreal-montane element.
Scarce Atlas Account
Equisetum pratense Ehrh.
A plant of often sloping, and thus well-drained, sites, on alluvial silt or similar sandy soils. It requires a fairly high base content in the soil and develops best in shady situations where calcium- or magnesium-rich water flushes the site, where it often grows with Crepis paludosa, Galium odoratum, Melica nutans and Trollius europaeus. In areas of higher rainfall it can become a moorland plant on micaceous schistose soils, but it is then often small in stature. It ranges from sea-level in the Hebrides to 850 metres on Sgorr Dhearg in Glen Coe.
E. pratense is a rhizomatous perennial. According to Page (1982), cone production is extremely poor and spasmodic in most British populations, a fact that he relates to the general trend for milder winters. The species is, however, persistent in the vegetative state.
Most of the sites known a century or more ago are still extant. It appears that many of the pre-1970 records are moorland sites where E. sylvaticum may have been erroneously recorded as E. pratense in the past or where E. pratense may have been overlooked in recent years.
E. pratense is an arctic-alpine species. It is common in Iceland and Scandinavia, and extends south to the Alps and Romania; central and northern Asia and the Caucasus. Its European distribution is mapped by Jalas & Suominen (1972). In North America it is found from Alaska to Nova Scotia, and south to New York, Michigan and South Dakota.
A. C. Jermy
PLANTATT - Attributes of British and Irish plants. (.zip 1455KB) This dataset was compiled and published in 2004, and last updated in November 2008. Download includes an Excel spreadsheet of the attributes, and a PDF explaining the background and nomenclature. Note that the PDF version is the booklet as published, whereas the Excel spreadsheet incorporates subsequent corrections.
A hardcopy can be purchased from the Centre for Ecology and Hydrology.
Atlas text references
. 1988. The Irish Red Data Book. 1. Vascular Plants.
. 1986. Atlas of north European vascular plants north of the Tropic of Cancer. 3 vols.
Jalas & Suominen (1972)
. 1978. Ferns and their allies. The Island of Mull: a survey of its flora and environment. :12.1-12.7.
. 1994. Scarce plants in Britain.