Laserpitium, commonly known as sermountain or laser-wort, is a genus of perennial herbaceous flowering plants in the carrot family (Apiaceae, order Apiales). It was formally described by Carl Linnaeus in his Species Plantarum (1753). The genus comprises eight accepted species distributed across Europe and Morocco, with their centre of diversity in the mountain ranges of central and southern Europe.
Plants in this genus are robust umbellifers, often reaching 50–150 cm in height. The stems are stout — in the broad-leaved sermountain (Laserpitium latifolium), up to 2 cm in diameter — and have a fibrous collar of persistent leaf-base remains at the base. The leaves are large and 1–2-pinnate with broadly ovate to oval, coarsely toothed leaflets. The characteristic compound umbels are many-rayed (20–40 rays in L. latifolium), with conspicuous bracts and bracteoles, and bear small white flowers. The dry fruits (schizocarps) are oblong, glabrous, and distinctively winged along their ribs — a feature that makes the genus readily recognisable within Apiaceae.
Species inhabit rocky and stony slopes, subalpine tall-herb communities, and montane woodland margins, primarily at colline to subalpine elevations. The most widespread species, Laserpitium latifolium (broad-leaved sermountain), occurs across much of Europe from the Pyrenees and Alps eastward. Other notable species include L. gallicum, L. halleri, and L. nitidum. Several plants formerly placed in Laserpitium have been reclassified into related genera including Siler, Silphiodaucus, Thapsia, and Laserocarpum following modern molecular phylogenetic studies.
Etymology
The name Laserpitium derives from Latin laser (also laserpicium), which in classical antiquity referred to the juice or resin of the now-extinct North African plant silphium (Ferula or a related umbelliferous genus). The name was applied by Linnaeus to this European genus on account of its morphological similarity to ancient descriptions of laser-bearing plants in the carrot family.
Distribution
Laserpitium is native to Europe and Morocco, with its greatest diversity in the mountain ranges of central, southern, and eastern Europe. Species occur predominantly in montane to subalpine zones — stony slopes, rocky meadows, and tall-herb communities in the Alps, Jura, Apennines, Pyrenees, Carpathians, and the mountains of the western Balkans and Iberia. Laserpitium latifolium has the broadest European range; other species such as L. halleri and L. nitidum are more regionally restricted alpine plants.
Ecology
Species of Laserpitium grow in open, well-drained habitats at colline to subalpine elevations — principally stony slopes, rocky grassland, and subalpine tall-herb communities (Hochstaudenfluren). Laserpitium latifolium is recorded from montane to subalpine bands in the Alps and Jura, often on base-rich substrates. Flowering occurs in July–August. The prominent winged fruits are adapted to wind dispersal.
Taxonomy Notes
Laserpitium was established by Linnaeus in Species Plantarum (1753). Molecular studies of Apiaceae have resulted in several segregations from the genus: Laserpitium siler has been moved to Siler montanum, L. prutenicum to Silphiodaucus prutenicus, L. nestleri to Thapsia nestleri, and L. pseudomeum to Laserocarpum pseudomeum. Eight species are currently accepted by the GBIF backbone (which lists 53 total descendants including synonyms). The genus belongs to subfamily Apioideae within Apiaceae.
