Table 1.

Species used in the study. All seeds were of commercial quality (B&T World Seeds, Paguignan, France). Seed masses are taken from supplier's best estimates

Species	Family	Life history	Seed mass (g)
Dicots
Petunia integrifolia Juss.	Solanaceae	Annual	5 × 10−5
Nicotiana tobacum L.	Solanaceae	Annual	5 × 10−5
Salvia viridis L.	Lamiaceae	Annual	1.7 × 10−3
Matricaria recutita L.	Asteraceae	Annual	6 × 10−5
Nigella damascana L.	Ranunculaceae	Annual	2.5 × 10−4
Monocots
Triticum aestivum L.	Poaceae	Annual	3.6 × 10−2