Fig. 1.

(A) Branching mode and spatial position of basicarpic (a) and aerial (b–f) dispersal units of Ceratocarpus arenarius on an individual plant and (B) morphology of the six types of dispersal units (first column), trichomes on bracts (second column), fruits (third column) and embryos (fourth column) in C. arenarius. a, dispersal units (basicarps) at the soil surface without glochids; b–f, dispersal units above the soil surface with short to long glochids. em, embryo; pe, perisperm; gl, glochid; ra, radicle. The stem of this tumbleweed breaks at the node that is labelled. (Circled material is from www.chinabaike.com)