id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
abc-1650	Pliszko, Artur; Jazwa, Malgorzata	Floristic composition of vegetation in habitats suitable for Erigeron × huelsenii (Asteraceae)	2017	6	.pdf	application/pdf	4012	227	64	Spontaneously occurring hybrids between alien and native plants have been well-documented (Vilà et al. 2000, Daehler and Carino 2001, Bleeker et al. 2007, Lehman et al. 2014, Stace et al. 2015), and according to Pyšek et al. (2004) they must be understood as alien plant species. This can be explained by the fact that in the early stages of secondary succession, abandoned sand and gravel pits are readily colonized by various plant species typical of ruderal, grassland and meadow communities (Řehounková and Prach 2006).	cache/abc-1650.pdf	txt/abc-1650.txt