Hedyotis is a very problematic genus or group of genera. Neither the overall identity and limits of this lineage, nor the evolutionary patterns within it, are at all understood or delineated. Widely differing treatments have long been used in different regions and floras. The situation is far from resolution or even general consensus and so many authors treat the genus very broadly[
]. In line with several recent (up to 2013) molecular and phylogenic studies, the Kew â€˜World Checklist of Selected Plant Familiesâ€™ has recognised a number of distinct genera and this is the treatment we are adopting here[
Hedyotis crassifolia Blume
Hedyotis hispida Retz.
Hedyotis hispida Roth
Hedyotis verticillata (L.) Lam.
Hedyotis wallichii Walp.
Oldenlandia angustifolia Benth.
Oldenlandia hispida (Retz.) Lam.
Scleromitrion crassifolium Miq.
Scleromitrion hispidum (Retz.) Korth.
Oldenlandia verticillata is an annual to perennial, spreading plant with diffusely-branched stems 15 - 100cm long growing from a stout taproot[
The plant is harvested from the wild for local use as a medicine.
E. Asia - China, southern Japan, India, Nepal, Bangladesh, Myanmar, Thailand, Vietnam, Malaysia, Indonesia, Philippines.
Sunny to lightly shaded positions in dry, less fertile, open localities, growing in old clearings, teak forest and thickets; at elevations from sea-level up to 1,600 metres[
The plant is found in the wild growing in sunny positions and in light shade, usually on dry, sandy, less fertile soils[
The plant is becoming an increasingly important weed in Malaysian plantations[
A decoction of the plant is drunk as a treatment for dysentery[
The aerial parts of the plant are made into poultices and applied for headache, and upon the abdomen of small children as a treatment for stomach-ache[
In a study of the methanol extract of the plant, it showed strong antioxidant activity comparable to or higher than a-tocopheraol, BHT and quercetin[
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