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In late summer and autumn (late August, beginning of November) of 2018 we observed a mass occurrence (more than 500 specimens) of  Salvia hispanica,  commonly known as chia, on gravel bars of several rivers in western Slovenia (the Soca and the Sava river basins). It was blooming on many sites in the first half of November, but low daily temperatures in the second half of the month prevented seed development. This Central-American (Mexico, Guatemala) species, which is distributed as a crop also outside its native range, grew mainly in initial plant communities of riverine gravel terraces classified into associations  Polygono lapathifoliae-Salicetum eleagni (described as new), Chaerophyllo-Petasitetum officinalis and  Bidenti frondosae-Panicetum barbipulvinati  nom. prov. The dominating species in these associations are perennials or hemicryptophytes (50%) and annual plants – therophytes (32%). The proportion of alien species (neophytes) is 22% and the proportion of species originating in America is 10%. The warmer climate with less precipitation and less frequent high waters in the last decade, combined with the fact that chia seeds are a commercially available food product or an ingredient in various foods (nutrients), increases the likelihood of successful seed production in chia plants and their distribution in nature. The threat of  Salvia hispanica becoming an invasive species is therefore serious. Key words : Chia, alien (adventive) species, plant communites, riverine gravel terraces, syntaxonomy, Slovenia  Izvlecek V poznem poletju in v jeseni (druga polovica avgusta-prva polovica novembra 2018) smo na prodiscih nekaterih rek v zahodni Sloveniji (povodji Soce in Save) ugotovili množicno pojavljanje vrste  Salvia hispanica , poznamo jo pod imenom cija (skupno vec kot 500 primerkov). Na precej nahajaliscih je v prvi polovici novembra tudi cvetela, razvoj semen pa zaradi bolj hladnih dni v drugi polovici tega meseca ni bil vec mogoc. Srednjeameriska vrsta (Mehika, Gvatemala), ki je kot kulturna rastlina že precej razsirjena tudi zunaj svoje domovine, je rasla predvsem v inicialnih združbah prodisc, ki jih uvrscamo v asociacije  Polygono lapathifoliae-Salicetum eleagni (opisali smo jo kot novo), Chaerophyllo-Petasitetum officinalis in Bidenti frondosae-Panicetum barbipulvinati  nom. prov. V njih ob trajnicah oz. hemikriptofitih (50 %) prevladujejo enoletnice – terofiti (32 %). Delež tujerodnih vrst (neofitov) je 22 %, delež vrst, ki so doma v Ameriki, pa 10 %. Zaradi toplejsega podnebja z manj padavinami in redkejsimi visokimi vodami v zadnjem desetletju in ker so semena cije v prosti prodaji ali kot sestavina razlicnih živil (hranil), je vecja možnost za uspesno semenitev rastlin in njeno sirjenje v naravi. Obstaja resna nevarnost, da bo vrsta  Salvia hispanica v prihodnjih letih postala invazivka.  Kljucne besede : cija, tujerodne vrste, prodisca, rastlinske združbe, Slovenija

folia biologica et geologica

Phytosociological description of sites of Salvia hispanica L. (Lamiaceae) on riverine gravel terraces in western Slovenia / Fitocenološki opis rastišč vrste Salvia hispanica (Lamia­ceae) na prodiščih v zahodni Sloveniji

Phytosociological description of sites of Salvia hispanica L. (Lamiaceae) on riverine gravel terraces in western Slovenia / Fitocenološki opis rastišč vrste Salvia hispanica (Lamia­ceae) na prodiščih v zahodni Sloveniji

Phytosociological description of sites of Salvia hispanica L. (Lamiaceae) on riverine gravel terraces in western Slovenia / Fitocenološki opis rastišč vrste Salvia hispanica (Lamiaceae) na prodiščih v zahodni Sloveniji