Study species
The Pyrenean rocket (S. austriacum subsp. chrysanthum
(Jord.) Rouy et Fouc) is a small, diploid (2n = 2x = 14)
biennial or perennial herb. It is a typical pioneer species
that colonizes sand, gravel and organic disposals on
rocky soils. The small bright yellow flowers are selfcompatible
and pollinated by insects (bees and syrphid
flies). S. austriacum flowers from June till August. Seeds
(mean seed weight: 0.3 mg) are dispersed by wind, fall
directly on the ground or are likely transported by
water through the movement of flowering branches
(Tutin 1983; Jacquemyn et al. 2010). Populations are
typically small and discrete.