Mexican wild petunia/Desert petunia (Ruellia simplex)

 An introduced herb or subshrub native to Mexico and South America. Cultivated in home gardens and occasionally escaped and naturalized. 

Liparis walkerae

An indigenous rather rare terrestrial herb grows under the shade of trees in the montane forests up to about 1829 m elevations. 

 

Hedyotis marginata

 An endemic shrub or small tree of upper montane shrubberies. 

Hedyotis neolessertiana

 An endemic shrub or small tree of upper montane shrubberies. Often in open and secondary areas. 

වියකෙයියා[Viyakeyya] (Freycinetia pycnophylla)

 An endemic woody-stemmed climber ascending tree trunks in the wet zone and hill country forests up to about 1500 m elevations. 

වල් දුම්කොළ [Wal Dumkola](Sonchus wightianus)

 Common weed of roadsides and in the mortar of bridges and road embankments in the lower montane zone. Flowering from January to June and probably throughout the year. Possibly a native herb of Sri Lanka since it is falling within the natural distribution range of the species. But in absence of specimens of it earlier than 1915 Sonchus wightianus also considered as an introduced species which is native to India and China (http://www.plantsoftheworldonline.org/taxon/urn:lsid:ipni.org:names:250399-1). 

Hedyotis cyanescens

 An utmost rare endemic herb of western lowland forests. 

හැළඹ[Halamba] (Mitragyna parvifolia)

An indigenous tree common in dry deciduous forests.

කන ගොරක/ගොකටු/කොකටිය[Kana Goraka/Gokatu/Kokatiya]/Gamboge (Garcinia cambogioides [Syn: Garcinia morella])

 An indigenous tree distributed in wet evergreen lowland forests. Sometimes also cultivated. Latex of this tree is an excellent gamboge which used locally for paintings and dyeing.