Click here to view an interactive map of the Northern Ireland dataset as currently collated by CEDaR.
The map is generated through the NBN Gateway using their Interactive Mapping Tool.
Euphrasia salisburgensis Funck
A distinctive annual, the leaves and bracts are usually bronze or purplish to dark brown, glossy and very sharply toothed. The plant is generally very dwarf when grazed, but can sometimes become quite a branched, bushy little annual. In the British Isles, Irish eyebright is confined to western Ireland. The headquarters of the species is very definitely in the Burren, County Clare, but it ranges in smaller quantity and discontinuous manner along the western limestones from Counties Limerick to Donegal, including Fermanagh.
The characters that allow recognition of this rare species are the complete absence of hairs on the upper margin of the heart-shaped fruit capsule, and the narrower leaves than in other Euphrasia species, which are at least one-and-a-half times as long as broad, hairless, and with 2 to 4 long, jagged teeth on each side. Typically the plant is low-growing and the leaves are a deep chocolate brown or purplish-brown and green in colour (Webb et al., 1996). The tiny flowers are white with purple veins, and they appear between June and September. The plant is of very small size, often only 2 to 12cm high.
All species of $Euphrasia$ in the British Isles are hemi- or semi-parasitic annuals, that is, they are attached and partially dependent upon the roots of host plants of a different species for $some$ of their nutrients. In most cases they occur within permanent or semi-permanent grassland communities. Irish eyebright is an indicator species of calcareous or base-rich soil conditions. Germination usually or always occurs in the spring, followed by attachment to the root system of a suitable host plant species, especially or almost exclusively, on common thyme. Availability of suitably open, bare soil for germination sites is likely to vary from year to year, and early season droughts also appear to affect successful germination or host-establishment. Small-flowered $Euphrasia$ species typically self-fertilise as the flower opens (Yeo, 1966), and therefore they form hybrids much less regularly than larger-flowered forms. Even small-flowered species like this one receive visits from hoverflies, the usual pollen transporter of this genus (A.J. Silverside, In: M.J. Wigginton (ed.), 1999). Irish eyebright is only weakly competitive and consequently, in common with other $Euphrasia$ species in Britain and Ireland, populations generally show marked fluctuations in abundance.
Irish eyebright can be determined from other Euphrasia species by the complete absence of hairs on the upper margin of the heart-shaped fruit capsule, and the narrower leaves.
How to see this species
It is locally frequent in Fermanagh but very easily overlooked on account of its very small size, often only 2 to 12cm high. It flowers in mid- to late summer. Elsewhere in Ireland, it is much more easily spotted in the Burren, County Clare, where it grows from sea-level on fixed sand-dunes to rocky limestone pastures at higher levels. Relevant access permissions should always be sought prior to visiting any sites.
The headquarters of the species is very definitely in the Burren, County Clare, but it ranges in smaller quantity and discontinuous manner along the western limestones from Counties Limerick to Donegal. It is confined in Northern Ireland to shallow, short-turf rocky grassland in the upland limestones of Fermanagh, west of Lough Erne, especially around the Knockmore and Monawilkin ASSIs. The species is much more common in the Alps and the Pyrenees, and it, or a closely related form, also occurs further north in Scandinavia and south-eastwards to Turkey and Crete (Clapham et al., 1987; Grey-Wilson and Blamey, 1995; Hulten and Fries, 1986; Map, 1683).
Why is this species a priority in Northern Ireland?
Threats/Causes of decline
Extreme rarity and isolation of a small population is always a threat in itself to long-term survival of a species, making it more vulnerable to chance environmental damage. Essentially a pasture species, it is sensitive to both excessive grazing pressure which prevents it seeding, and abandonment of grassland management leading to the growth of taller, shading grasses and herbs. Nutrient enrichment or herbicide pollution could also oust the species, either due to increased competition from vigorous rivals or straightforward poisoning.
Conservation of this species
What you can do
Records of new sites and estimates or counts of the sizes of populations are always valuable. Send information (including photographs, if obtained) to The Botanical Society of the British Isles – c/o of Botany Department, National Museums Northern Ireland, 153 Bangor Road, Cultra, Co. Down, BT18 0EU or to CEDaR, National Museums Northern Ireland, 153 Bangor Road, Cultra, Co. Down, BT18 0EU, Tel: 028 9039 5256, cedar.info [at] magni.org.uk.
Text written by:
Dr Ralph Forbes