ME. G. -bektham: oh gbamife^. 49 



half that size. The involucres sometimes remain persistent after 

 the spikelets have fallen away, and the filiform styles are remark- 

 ably long; but many cultivated specimens and some East- African 

 ones, possibly wild, oifer so much variety in these respects, some 

 passing quite into normal Penniseta, that it seems probable that 

 the peculiarities of habit have arisen from long cultivation. The 

 long styles united at the base occur in other species, amongst 

 which P. ( Oymnotrix) macrostachyum, Brongn., has on that account 

 been proposed by Hasskarl as a genus, under the name oiSericura. 

 AmpJiocJKSta of Andersson is a Gralapagos species of the Gymnotrix 

 group, with small spikelets in slender pedunculate spikes, forming 

 a loosely paniculate inflorescence, very different from that which 

 characterizes the greater number of Penniseta, but closely con- 

 nected with them through the several varieties of P. ( Grymnotrioo) 

 tristachyum, Kunth. In P. {Gymnotrix) unisetum, Nees, an 

 African species proposed as a genus by Eigari and De Notaris 

 under the name of BecTceropsis, this peculiar inflorescence is 

 carried still further, and the involucre is sometimes reduced to a 

 single bristle (always above the articulation and falling away with 

 the spikelet), though I usually find 2, 3, or even more bristles. 

 It is probable that the plant figured by Beauvois as Setaria lov^gi- 

 seta is this same species of Pennisetum. Steudel's proposed genera 

 CatatTieropJiora and Oxyanthe are normal species of Pennisetum 

 {Gymnotrix). 



li. PLA&iosETrM, Benth.,is a single Australian species, which 

 I characterized as a genus chiefly from its peculiar inflorescence 

 and habit, which prevented my retaining it in Pennisetum without 

 an extension of the generic character beyond what I felt justified 

 in proposing. 



15. Paeatheeia, Grriseb., is a single "West-Indian species, 

 which proves to be identical with the Brazilian plant since pub- 

 lished by Doell as a section of Leptachyrium of Panicum, but 

 which is evidently more nearly related to Pennisetum. The 

 inflorescence is a simple spike-like panicle, of which the numerous 

 short articulate branchlets or pedicels are continued beyond the 

 single spikelets into long awns or bristles, which fall away with 

 the spikelet like the involucres of Fennisetum, thus forming in 

 some sort a connexion between the Genchrus group of genera and 

 the following one. 



Our third or ChamcBraphis group of Panicese consists of seven 

 small genera, loosely connected by a character which may be con- 



