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Kivonat:

A new occurrence of the neophyte clammy goosefoot (Chenopodium pumilio) was discovered in Budapest (8580.1 flora mapping grid) in August 2011. The population grows in trampled ruderal vegetation along a busy street. The estimated size of the population is about 50 individuals, however, its abundance is strongly affected by urban weed control. A few herbarium specimens were collected for the Hungarian Natural History Museum (Budapest) by Zoltán Barina.

Chenopodium pumilio R. BR. [syn. Ch. carinatum non R. BR., Dysphania pumilio (R. BR.) MOSYAKIN & CLEMANTS] is a native species in Australia and has been registeredin Western and Central Europe around from the 1890s. Recently its establishment has been reported from many regions and in several countries it is considered to be a naturalized species (Priszter 1965, Chytry 1993, PyŠek et al. 2002, Ottich 2004, Verloove 2006, Grozeva 2007, Celesti-Grapow et al. 2009, Witoslawski 2009, Arianoutsou et al. 2010).

The first records of Ch. pumilio in Hungary are dated back in the 1920s when Polgár (1925) recorded it as „Chenopodium carinatum” at the vicinity of the Meller’s oil factory in Győr. Later Polgár corrected the nomeclatural mistake (Polgár 1940), however, the persistance of the population in Győr was not reported anymore. In the 1960s Priszter (1965) had been monitoring a population of Ch. pumilio at the railway station of Gárdony but, based on the lack of later supporting data from this locality, this population is probably extinct too. Priszter (1965) gave the first detailed description of the species in Hungary and discussed the circumstances of the occurrence in Gyır as well. Basic Hungarian works (Soó 1970, 1980, Soó – Kárpáti 1968, Simon 1992, 2000) mention Gárdony as its only locality, while Király (2009) refers both to the occurrences in Győr and Mezőföd geographic region (including Gárdony). Despite the lack of data from the last four decades, Balogh et al. (2004) considers Ch. pumilio as a naturalized neophyte in Hungary.

Conclusively, the finding of Ch. pumilio in Budapest provided the third record, and currently the only known occurrence of this species in Hungary. The locality is close to traffic junctions frequently visited by foreign tourists, that can be the source of the establishment.