Andrographis paniculata

Andrographis is an interesting plant. Here is how it's described in the Richter's herb catalog:

"(Kalmegh) In Scandinavia this is the main herb used to fight the common cold, flu, and upper respiratory infections. Clinical trials have shown that this herb really works and many believe that it is better than echinacea. Like echinacea, it works by boosting the immune system, helping the body to battle infections and to prevent them from reoccurring in the future. But it does more: it has adaptogen-like properties, it has anticancer activity, it is a bitter tonic, and it is an antioxidant that has been shown to protect the liver. In China and India the plant is commonly used to treat a wide range of infections such as gastrointestinal complaints, hepatitis, herpes, and throat infections. In short this is one amazing medicinal herb! Easy to grow annual and easy to use. "

So I thought, why not grow it? A word to the wise - research your plants before you grow them. Turns out andrographis is also known as "King of the Bitters". I tried one leaf, once, in a cup of tea. Its bitterness stuck around for the next several hours. So all it does is grow into a spindly shrub, flower, and set seed prolifically in the one-gallon pot it's been allotted, and get pointed out to people interested in the nondescript plant. 

That's it, with the small, sword-shaped leaves, invading a pot of hippeastrum.