Eranthemum, commonly known as Blue Sage or Blue Eranthemum, is a shrub characterized by its bright blue, tubular flowers that bloom from green-and-white veined bracts. The plant features large, hairy, dark green leaves and can grow to be a sprawling shrub, often kept lower through pruning. It thrives in light shade and is easily propagated from cuttings. 

Here's a more detailed description: 

Flowers:

The most striking feature is the bright gentian blue flowers, an unusual color in tropical settings. These flowers appear from prominent green-and-white veined bracts, which persist even after the blooms fall, creating a long-lasting display.

Foliage:

The leaves are large, hairy, and dark green, providing a lush backdrop to the vibrant flowers.

Growth Habit:

Eranthemum pulchellum can be a sprawling shrub, but is often pruned to maintain a more compact shape. It can reach a meter or more in height.

Habitat and Cultivation:

It prefers light shade and can be grown in gardens or greenhouses, needing warm conditions. It is easily propagated from cuttings.

Other Names:

It's also known as Blue Sage, Gulsham, Neelambaram, and Neelamulli.

Uses:

It is popular as an ornamental plant, particularly in tropical India and China. In traditional medicine, a decoction of its roots, stems, and leaves is used for antimicrobial, antiseptic, and wound healing purposes.