DESCRIPTIONS OF TRIBES AND GENERA. 61 



cemes very many, in whorls upon slender pedicels , these 

 are arranged above one another, forming a panicle. 



Species two. A. squarrosus L., fil. {A. muricatus 

 Retz., Anatherum muricatum Beauv.). Spikelets small, 

 narrow ; empty glumes cartilaginous, beset with small 

 spines. Swamp plants, called in India " Khushus" or 

 " Bena," in the French colonies " Vetives." [Introduced 

 in Louisiana, where it has become spontaneous.] The 

 rhizome is very aromatic. In India the whole plant is 

 used in making the " Vessaries," or broad fan-screens, 

 which when kept wet and placed in a current of air, 

 cool and at the same time perfume the heated atmos- 

 phere of a room. When laid among clothing the rhizome 

 keeps it free from insects. In European drug stores it 

 is known as Radix Anatheri or H. Vetiverice, a stimulant 

 or antiseptic. It is also used in perfumery (Vitivert). 



Sub-genus IX . Chrysopogon (Trim as a genus ; Rhaphis 

 Lour.). Racemes whorled, pedicellate, usually reduced 

 to one or two terminal joints. Spikelets somewhat 

 laterally compressed. 



Species twelve {A. Gryttus in S. Europe and Asia, 

 etc.), with one exception (A. pavciflorus = Sorghum pauci- 

 florum Chapm.) from the Old World. 



Series B. Heterozygi. Sessile spikelet of the lowest 

 pair or of several of the lower pairs (at least in one or 

 two racemes) differs from the upper pairs in sex and 

 awns, or is empty. 



Sub-genus X. Dichanthium (Willemet as a genus, Le- 

 peocercis Trim). Racemes usually three to many, digitate, 

 all pedicellate or all sessile, not subtended by a leaf- 

 sheath. Flowering glume usually stalk-like. 



Species ten, in the tropics of the Old World, two of 

 them (A. piptatherus Hack., A. Neesii Kunth) ,also in 

 America. 



Sub-genus XL Cymbopogon (Spreng. as a genus). Ra- 

 cemes in pairs, terminal upon the culm or its branches, 

 one sessile, always with 1-2 basal homogamous pairs 

 (of 2 $ spikelets), the other short pedicelled with or 

 without homogamous pairs, both together subtended by 

 a sheathing leaf, frequently arranged in a false panicle 



