Described from Europe.

Artemisia santonicum subsp. patens (Asteraceae) was recently collected from Edirne and Çanakkale (north-west Turkey) and it has been reported as a new subspecies record for the flora of Turkey (Cullen, 1975; Tutin & Persson, 1976). Recently, new taxa and new records of publications have increased with the increasing revision studies (Akçiçek, 2010; Aytaç & Duman, 2010; Dirmenci et al., 2010). A. santonicum subsp. santonicum is generally distributed in the Central Anatolia region, at an altitude between 938 and 1000 m in Turkey. The habitat of the plant is calcareous and saline steppes and slopes. However, A. santonicum subsp. patens is distributed at an altitude between 4 and 5 m, generally in coastal areas in the Marmara and Aegean regions. The plant (subsp. patens) grows in moist (temporarily covered with water) areas (Cullen 1975; Tutin & Persson, 1976). A. santonicum subsp. santonicum spreads in eastern Austria, western Kazakhstan, north-east Greece, the Czech Republic, and Slovakia. However, A. santonicum subsp. patens spreads in eastern Austria to western Romania (Tutin & Persson, 1976). The separation of the 2 subspecies belonging to A. santonicum is given below. 1. Branches of synflorescence generally spread or close to main axis; capitula usually erect, very rarely nodding, flowers usually yellow, partially red at maturity subsp. santonicum 1. Branches of synflorescence generally horizontal; capitula usually nodding, flowers usually red, very rarely partially yellow subsp. paten