“…Given that awns are a large resource investment for many grass species and potentially convey important plant fitness benefits (Adams and Tainton, 1990), it is surprising that more consideration has not been given to this variation. While some previous studies have examined the effect of awn morphology on diaspore dispersal (e.g., Peart, 1979Peart, , 1981, microsite selectivity (e.g., Fowler, 1986) and diaspore burial (e.g., Tothill, 1969;Peart, 1979), most studies on awns have been on the mechanics of hygroscopic awn movement (e.g., Murbach, 1900;Abraham and Elbaum, 2013;Elbaum and Abraham, 2014;Jung et al, 2014;Masrahi and Shaye, 2017), and the comparison between these active awns and rigid, passive awns (e.g., Peart, 1984;Peart and Clifford, 1987).…”