Ceratocapnos is a genus of flowering plants in the family Papaveraceae (treated as Fumariaceae by some authorities), placed in the order Ranunculales. It is native to Europe, the Mediterranean, and Western Asia. The genus is best known through its most widespread species, Ceratocapnos claviculata (climbing corydalis), a delicate-looking annual — occasionally perennial — scrambling plant reaching up to a metre in height. Its weak, often pinkish stems clamber over surrounding vegetation and debris, aided by tendrils at the leaf tips. The leaves are pale to medium green, doubly compound, with well-stalked leaflets divided into three to five sub-leaflets and terminating in a branching tendril. Flowering occurs from May through September (in the UK), producing small, pale creamy-yellow, tubular flowers about 6 mm long in short axillary spikes. Each flower bears a lip and spur, with stamens arranged in two bundles, and the short seed pods typically narrow between the two seeds. The genus was erected by Swedish botanist Magnus Lidén in 1984, reclassifying species previously placed under Fumaria and Corydalis. While some taxonomies recognize up to three species (C. claviculata, C. heterocarpa, C. turbinata), Ceratocapnos claviculata is the most widely documented.
Etymology
The genus name Ceratocapnos is formed from Greek roots: "kerato-" (κέρας, meaning horn) and "capnos" (καπνός, meaning smoke), the latter referencing the plant's affinity with fumitories (Fumariaceae / Fumarioideae, from Latin fumus = smoke). The specific epithet of the type species, "claviculata," is Latin for "having tendrils" or "tendrilled," describing the branched tendrils at the leaf tips that allow the plant to clamber over other vegetation.
Distribution
Ceratocapnos is native to Europe, the Mediterranean region, and Western Asia. The most widespread species, C. claviculata, occurs along the Atlantic fringe of western Europe, recorded in Belgium, Denmark, France, Germany, Ireland, the Netherlands, Spain, Portugal, and Norway. The United Kingdom holds the largest proportion of the global population, where it is found in most counties (especially western ones) but is absent from Orkney, Shetland, and the Outer Hebrides, and rare in Ireland.
Ecology
Climbing corydalis grows on the edges of woodlands and on previously wooded sites, preferring acid, sandy, or peaty soils in sheltered, half-shaded positions. It can become abundant in disturbed areas of recently cleared plantations or woods, clambering over wood debris, and also thrives in impoverished soil under bracken, likely because it flowers early in the year before the bracken fronds fully develop. The species serves as a food plant for the weevil Procas granulicollis and the beetle Sirocalodes mixtus. Pollination is carried out by honey bees (Apis mellifera) and bumblebees (Bombus spp.).
Taxonomy Notes
The genus Ceratocapnos was established by Swedish botanist Magnus Lidén in 1984 (Anales del Jardín Botánico de Madrid, vol. 41, p. 221). The type species, C. claviculata, was originally described by Carl Linnaeus under the name Fumaria claviculata and later placed in the closely related genus Corydalis before Lidén's revision segregated it into Ceratocapnos. The genus sits in the family Papaveraceae (or Fumariaceae, treated as subfamily Fumarioideae within Papaveraceae under the APG IV classification) in the order Ranunculales. While the Wikipedia genus page lists three species (C. claviculata, C. heterocarpa, C. turbinata), some taxonomic treatments and databases differ on the circumscription of the genus.
Conservation
Ceratocapnos claviculata is assessed as Least Concern in the United Kingdom (as of 2005). No broader IUCN Red List assessment was found for the species or genus.
