50 ME. G-. BEJTTHAM ON GEAMINEiE. 



sidered as rather artificial than natural, but which I believe to be 

 constant. The spiiielets are nearly those of Fanicum, but with 

 the fruiting glume usually less hardened; the inflorescence is 

 nearly that of the paspaloid Fanica or of the Chloridese, but dis- 

 tinguished from the former by the rhachis of the partial spikes or 

 fascicles or branches of the panicle being produced beyond the 

 spikelets into a more or less rigid point. From Chloridese the 

 articulation of the pedicel below the spikelet always separates the 

 present group. The genera are : — 16. Echinol^na, Desr., a 

 single tropical American species (H. scabra), which has quite the 

 rigid single spike of some Chloridese, but the spikelets of Paniceae 

 intermixed with barren ones, on which account Eudge originally 

 figured the plant as a Cenchrus. The loosely paniculate species 

 added to EcMnolcena by Kunth have been rightly restored to 

 Fanicum by Trinius. 17. Chamjeeaphis, Br., four Australian or 

 tropical Asiatic species, fully described in my ' Flora Australiensis.' 

 18. Spaetina, Schreb. {Trachynotia, Mich., Limnetis, Pers., Fon- 

 celetia, Thou., SolenacJine, Steud.), five or six European, African, 

 or American species, chiefly maritime, has been usually placed 

 amongst Chloridese ; but the spikelets themselves containing a 

 single terminal flower, and the articulation of their pedicels, are 

 quite those of Pauicese, fiot of Chloridese. 19. Xeeoohloa, Br., 

 three Australian species, 20. Stenotaphettm, Trin. (Biastem- 

 anthe, Steud.), two or three tropical maritime species, 21. Phtl- 

 LOEHACHis, Trimen, a single one from Angola, and 22. Thuaeea, 

 Pers. ( OrnitJiocep'halochloa, Kurz), also a single maritime species 

 from the shores of the Indian and South- Pacific oceans, are all 

 perfectly isolated genera whose peculiarities have been well 

 pointed out. StenotapTirum is the only genus I know in the 

 tribe Paniceae which has the rhachis of the inflorescence articu- 

 late ; but this can usually not be perceived except in an advanced 

 state, and has been denied by some botanists. I have already 

 alluded (Journ. Linn. Soc, Bot. xvii. 196) to Kunth's mistake, 

 which induced him to alter Persoon's name Thuarea (abridged 

 from Thouars's then MS. name of Microihuarea) to Thouarea. 



There remain seven very anomalous genera, but little connected 

 with each other, and still less with any other genera of Gramineae, 

 but which have all more of the general character of Panicese than 

 of any other tribe. They have all been well defined and illus- 

 trated, and require no more than a bare enumeration on the 

 present occasion. They are : — 23. Spinifex, Linn., three Austra- 



