Hladnikia is a monotypic genus of flowering plants belonging to the family Apiaceae.[3] Its sole species, Hladnikia pastinacifolia, is a Slovenian paleoendemite,[4][5] restricted to the area of only 4 km2, located in Trnovo Forest Plateau, karst plateau of Western Slovenia.[6] German botanist Heinrich Gottlieb Ludwig Reichenbach named the genus after Carniolan botanist and founder of Ljubljana Botanical Garden Franz Hladnik.[4][7]
Hladnikia pastinacifolia is a monocarpic herbaceous perennial plant, which takes a few vegetation periods to develop into a flowering plant.[6] Individuals, which have erect flowering stem, can reach from 15 to 30 centimetres of height.[8] At first plant's leathery and glossy leaves are simple shaped and arranged into rosettes. Later on, as their area increases, leaves also change shape into lobate.[6][8] Hladnikia pastinacifolia resembles well-known celery (Apium graveolens), but has thicker foliage and shorter leaf stems.[4] The species' root is long and lignified. The plant's flower has white, heart-shaped and 1 mm long petals.[8]
Not much is known about the plant's exact breeding system. This plant species is entomophilous and has multiple different pollinators. It is thought that outcrossing happens occasionally.[6] The species flowering period is between Mai and July.[4] After successful pollination seeds that don't have any special dispersal adaptation develop between the end of August and into September. A fruit is a schizocarp, which after maturing splits into two 4 mm sized mericarps,[6] 2 mm wide.[8]
Hladnikia pastinacifolia chromosome number is 2n = 22.[8]
The plant is a Slovenian paleoendemic species restricted to small area (4 km2) in Trnovski gozd. There these plants grow only on southern slopes of the plateau and two isolated areas located 9 km away on the northern slopes.[6] As the plant species is not a habitat specialist its growing areas are various; Hladnikia pastinacifolia was found on stony grasslands, rock crevices and screes. Laboratory molecular analyses have shown that Hladnikia pastinacifolia is a Pleistocene survivor in situ.[8]
Even though its population trend is labeled as stable by IUCN Red list, it has data deficient (DD) conservation status.[9][1] Among mentioned threats are human intrusions and disturbance (such as recreational activities) as well as natural system modifications.[1] The Trnovo Forest Plateau is listed as Natura 2000 site.[9][10] Because of its small area of distribution and different threats the species is studied for possible cryopreservation.[5][11][12]
Hladnikia is a monotypic genus of flowering plants belonging to the family Apiaceae. Its sole species, Hladnikia pastinacifolia, is a Slovenian paleoendemite, restricted to the area of only 4 km2, located in Trnovo Forest Plateau, karst plateau of Western Slovenia. German botanist Heinrich Gottlieb Ludwig Reichenbach named the genus after Carniolan botanist and founder of Ljubljana Botanical Garden Franz Hladnik.
