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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Biological Flora of the British Isles: Silene suecica
Auteurs :	Laszlo Nagy, Auteur
Type de document :	Article
Dans :	Journal of Ecology (101(2) MAR 2013)
Article en page(s) :	532-544
Langues:	Anglais
Résumé :	1. This account presents information on all aspects of the biology of Silene suecica (Lodd.) Greuter therefore, S. suecica is perceived as a stress-tolerant, competition-avoiding species. Nonetheless, it also grows in more or less closed alpine grassland in Europe; in North America and Greenland, it is known from tundra, rocky barrens, gulleys and river outwashes, grassy slopes and sea cliffs. 3. Silene suecica is a (semi-)rosette plant with a strong taproot, with no capacity for vegetative spread. The main perennating organ is the slightly lignified rootstock/taproot. The rosette has winter-green leaves; after flowering the rosette leaves die, but new lateral rosettes may be produced in the following year. The longevity of the species is between 3 and 10 years, with the time of first flowering depending on rosette size. Plants that have flowered may die (semelparous individuals), but some are iteroparous and flower again on lateral shoots. 4. Silene suecica produces protandrous hermaphrodite flowers, but self-pollination may occur. In Scotland about 10% of all plants flower in any year. Pollination is by a range of insects, including flies and bees. Capsules produce up to 80 seeds (mean = 30). 5. Silene suecica has probably not declined in the British Isles and, in fact, a slight population expansion in permanent plots was observed in Scotland in the early 1990s. Nonetheless, it remains classed as vulnerable to extinction because of its restricted distribution. Both of its British locations are protected as SSSI and SAC (Natura 2000) within national parks. It is common in many countries within its distribution range.

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