Reseda lutea L.  

Scientific classification:

Kingdom: Plantae
Class: Rosids
Order: Brassicales
Family: Resedaceae
Genus: Reseda 
Sp: R.lutea

Arabic name : Dhanabnab, Dhanban
Saudi Arabia: Apparently a very patchy distribution. Isolated collections from eastern region and southwest .
Distribution: N. Africa, W & S Europe, SW Asia.

Habit: Annual or perennial, glabrous or papillose-scabrid, much branched herb up to c. 60 cm tall.
Leaves: palmately or ternately divided into linear-oblong to spathulate lobes.
Flower: 6-8-merous. Petals yellow, posterior petals 3-lobed, central lobe linear oblong, lateral semilunate, longer and much wider than central lobe, entire or shallowly toothed Stamens 15 20; filament not persistent below the capsules. Capsule 3-toothed, oblong-cylindrical, erect or nodding on capillary pedicels as long as or shorter than the capsules. Seeds tuberculate, glossy.