24), identified by Royle with the Andropogon Calamus aromaticus or roosa grass of India; cassia (Heb.
It was the Calamus aromaticus of the medieval druggists and perhaps of the ancients, though the latter has been referred by some to the Citron grass, Andropogon Nardus.
They however occur in a whole section of Andropogon, in Anomochloa, and at the base of the spike in Sesleria.
Many are savanna grasses, in various parts of the tropics, for instance the large genus Andropogon, Elionurus and others.
Other aromatic members are Andropogon Nardus, a native of India, but also cultivated, the rhizome, leaves and especially the spikelets of which contain a volatile oil, which on distillation yields the citronella oil of commerce.