Table 2.

Some medicinal plants evolved with an extensive and efficient mechanism to adapt to heavy metal stress.

Name plant	Heavy Metal	Place of accumulation	Indicator feature	References
Portulaca oleracea L.	Cd	aerial parts	High tolerance in a polluted environment, Good phytoremediation for Cd	Kale et al., 2015; Sivakumar et al., 2020.
Salvia officinalis	Hg, Cd, Pb	Root, Shoot, Leafe, flowers	Hyperaccumulator for Pb, No transfer of metal to essential oil	Sulastri and Tampubolon, 2019; Angelova et al., 2015
Lavandula angustifolia	Cd, Pb	Root, Shoot, Leafe, flowers	No transfer of cadmium metal in essential oil and the presence of a small concentration of lead in essential oil	Simion et al., 2021; Angelova et al., 2015
Hypericum perforatum	Ni, Cd	Root, aerial parts	Cd accumulator	Bağdat and Eid, 2007; Jisha et al., 2017.
Cannabis sativa L.	Cd, Pb	Root, aerial parts, seed, fibers	High biomass	Linger et al., 2002; Citterio et al., 2005; Rheay et al., 2021.
Arabis arenosa	Cd, Ni	Root, aerial parts	Cd accumulator	Eskandari and Alizadeh-Amraie, 2016,
Ocimum gratissimum L.	Cd	Root, aerial parts	No transfer of metal to essential oil	Chaiyarat et al., 2011; Wiangkham and Prapagdee, 2018.
Mentha spicata L	Pb	Root, aerial parts	No transfer of metal to essential oil	Prasad et al., 2010; Chrysargyris et al., 2019.