The newly-weds were escorted to a flower-shrouded bench near a sweet-smelling, rough-leafed harsingar tree in white and orange bloom;... (p. 18)
A harsingar tree (Nyctanthes arbor-tristis) is a large shrub or a small tree, native to southern Asian, that blooms at night. Its fragrant flowers are white with bright orange centers, and grow in clusters.
Other common names for the tree are Har Singar, Harsinghar, Tree of Sorrow, Night-flowering Jasmine.
In the name of full disclosure, I am not an expert on Hindi, India, or literature. The explanations you find here are the compilation of what I can find on a given term or a phrase. If you see a mistake or if you would like to contribute, please let me know by posting a comment. Thank you.