Pearl Flower (Heterocentron subtriplinervium)

An introduced small shrub native to Mexico. Cultivated as a ornamental plant but a potential invader. 

Polygala longifolia [Syn: Polygala leptalea]

Very rare or extinct native herb as per Flora of Ceylon, distributed (According to Thwaites) among long grass in dry low country around Nilgala in the northern part of the Uva province. However it occurs in eastern intermediate to dry zone areas and now considered as an Endangered plant (Red List 2012 & Vlas J&J, 2012). 

Chickweed (Stellaria media)

An indigenous creeping and ascending small herb, occurs among short grass in open places, gardens and cultivated grounds in upper hill country. Locally common. Flowering from December to February.

Stinking Cassia (Senna hirsuta [Syn: Cassia hirsuta])

An introduced weed, common in waste places, disturbed vegetations and open places. 

African Lily/Lily-of-the-Nile (Agapanthus africanus)

An introduced large herb native to Southern Africa. Cultivated in the montane region as an ornamental and for cut-flowers.

Montbretia (Crocosmia × crocosmiiflora)

An introduced ornamental herb cultivated at high elevations. Escaped and naturalized in open places, along roadsides, footpaths etc. It is a fertile hybrid between Crocosmia pottsi and Crocosmia aurea both native to Africa.

පේර[Pera]/Guava (Psidium guajava)

An introduced small tree or shrub widely cultivated in home gardens for its edible fruits. Native to tropical America.

මළ මිරිස් වැල්/වල් ගම්මිරිස් [Mala Miris Wel/Wal Gammiris] (Piper fallax [Syn: Piper sylvestre])

An indigenous terrestrial vine common in the lower hill country and ascending to about 800 m a.s.l. (Rarely up to 1300 m a.s.l.) Rare and usually confined to gallery forests in the dry zone. Most frequent in secondary forests. 

Whorled twintip (Stemodia verticillata)

An introduced annual herb native to tropical America. Naturalized in cultivated grounds and roadsides of the hill country. Flowering from July to December.
Flower size - About 0.3 cm across.

Dicliptera japonica [Syn: Peristrophe japonica]

An indigenous (?) prostrate herb grows among grass in light shade of the Northern dry and intermediate regions.

*An addition to the flora of Sri Lanka by J. &J.  de Vlas, 2008
*** With the J. & J. deVlas, 2019 this plant was re-identified as endemic Dicliptera neesii. So that Peristrophe japonica is no longer a plant species occurs in Sri Lanka. 

හිඟුරු පියලි[Hinguru Piyali] (Kaempferia galanga)

An introduced herb native to the India. Cultivated in gardens.

පතන බෝ/කවුඩු බෝ/කපුටු බෝ[Patana bo/Kaudu bo/Kaputu bo] (Ficus arnottiana)

An indigenous small banyan or independent tree without aerial roots, occurs in dry zone open forests, on grassy hillsides and rocky places below 1000 m a.s.l. 

රන්වන් කටු කරඩු[Ranwan Katukarandu] (Barleria lupulina)

An introduced small shrub native to the Mauritius. Cultivated as a hedge plant in home gardens. 

Setaria barbata

An indigenous grass species with uncertain origin but surely native to the Old World. Common in weedy grassy areas with at least partial shade and in lawns and flower beds from 500 to 800 m elevations (As per Flora of Ceylon Vol 8. But it is now spread to much lower elevations)

වල් නිවිති[Wal Nivithi] (Cissus vitiginea)

Common native liana climbing in trees and shrubs of the dry lowlands. Flowering recorded from all months excepts May. 

වල් වරකා[Wal Waraka](Casearia zeylanica[Syn: Casearia esculenta])

Common native shrub or tree found in dry zone forests, open scrub lands, sand dunes, secondary sub montane forests, coconut plantations, mangrove swamp margins and gallery forests along sandy river banks from sea level to 1500m elevations. Fruits edible. 

Petiveria alliacea

An introduced small shrub native to the tropical America. Escaped and naturalized along forest edges and hedges as well as the waste grounds around the Kandy (and probably Mathale) . 

බණ්ඩක්කා [Bandakka]/Lady's fingers/Okra(Abelmoschus esculentus)

An introduced annual herb probably native to the Ethiopia. Widely cultivated in gardens and plantations for its edible fruits. 

ඇටෝර/ඇටවරා[Etora/Etawara](Panicum repens)

An indigenous weedy perennial grass species common along roadsides, edges of marshes, ditches, paddy fields and  tanks from sea level up to about 2000 m a.s.l.

මුං/මුං ඇට/බූ මෑ[Mun/Mun eta/Bu me]/Green gram/Jerusalem pea/Mung bean/(Vigna radiata)

An erect or climbing herb. Cultivated crop of ancient uncertain origin. Also naturalized in the dry areas. Pods eaten raw or cooked. Whole or split seeds used in soup and other preparations.