How should I propagate a serpentina plant?

Question

I have this serpentina plant from the Philippines. I'd like to use it to grow some more. How do I propagate it? Do I need cuttings or does it have seeds? If it has seeds, how do I find them?

Answer 1

The image you are using (http://i.stack.imgur.com/nw9ie.jpgs) is of Andrographis paniculata. Some places ascribe copyright to emeritus Prof Kazuo Yamasaki. Is there a reason you did not take your own picture of your plant?

Edit: the new pictures you posted are of the same plant.

An erect shrub, Andrographis is green with sparse lanceolate leaves up to 5 inches long on green stems. The leaves are scentless. The shrub’s small flowers are tubular-shaped and white with pale violet streaks.

According to http://www.gardenguides.com/132160-propagation-andrographis.html

The seeds of Andrographis paniculate are covered with a hard coat of wax, making them difficult to germinate. A Chinese agronomist recommends scarifying the seeds with fine sand to remove the layer of wax, then soaking them in warm water for 24 hours. Agronomists at Kerala Agricultural University, in Kerala, India, recommend soaking the seeds for six hours before sowing them.

and from http://www.herbsarespecial.com.au/isabells_blog/isabells-articles/king-of-bitters.html

Description: Easy to grow, annual/biennial bush to 1 meter high, with lanceolate leaves 4-12cm long. Small white flowers 1-2 cm long, set along a thin upright stem. Tubular flowers can have purple coloured flecks on the inside of the lip-like formation. A fine oblong seed capsule 1.5 cm long contains several very small round seeds. Seeds will readily disperse if not picked. Leaves have no aroma. Flavour of the whole plant is extremely bitter. Propagation is by seeds, cuttings and layering stems. Plant seeds, spring and summer, germination may be in 10- 30 days. Plants will grow in a wide range of soils, in full sun or shade and thrives in moist conditions.