ME. a. BENTHAM ON GEAMINEiE. Ill 



cMoris, but with the spikelets of Triodia. Triehoneura, Anders., 

 is Leptochloa Lindleyana, Kunth, from the Galapagos Islands, 

 with the habit nearly of Diplaahne fasoicularis, but with the 

 characters of Triodia. Leptochloa mollis, Kunth, from Senegal, 

 which I have not seen, would appear from his figure to be a 

 Triodia, near to the T. plumosa, but with the loose panicle of 

 T. Lindleyana. Rhombolytrum, Link, is T. filiformis, Nees, a 

 Chilian species, very near to the North-American T. albescens, 

 and T. trinerviglumis, Munro, and also to T. KerguelensiSj 

 Hook, f., and T. antarctica (Gatahrosa antarctica, Hook, f.), from 

 extreme southern America. 



7. DiPLACHNE, Beauv., now comprises about fourteen species, 

 dispersed over the tropical and temperate regions both of the 

 New and the Old World, and variously referred to Triodia, 

 Leptochloa, or Molinia by different agrostologists ; and the genus 

 is really closely connected with the two first-named, but more 

 especially with the Triodice of the. typical section Uralepis. 

 Prom these it chiefly differs in inflorescence : the branches of 

 the panicle are long and slender ; the spikelets, almost linear, 

 scattered along the rhachis and sometimes sessile or nearly so 

 in two rows, but not regular and unilateral enough to place the 

 genus in Chloridese, to which it is sometimes referred. The cha- 

 racteristic teeth of the flowering glumes are also sometimes very 

 minute. Whatever position, therefore, we give to the genus, it 

 must be more or less an arbitrary one ; but that next to Triodia 

 seems the least objectionable. 



8. Teiplasis, Beauv. {Biplocea, Eafin.), has two North-Ameri- 

 can species (Uralepis cornuta, Ell., and TI. purpurea, Nutt.), with 

 a narrow, slender, slightly-branched panicle, and the flowering 

 glumes deeply divided into three narrow lobes, the central one a 

 slender awn. The South-American Triplasis setacea, Gtviseb., is 

 a Biplachne (D. spicata, Doell). 



9. ScLEEOPOaoN, Philippi {Lesourdia, Fourn.), has four species, 

 one from Chile, the others from the Mexican-Texan region, all 

 remarkable for the unisexual spikelets, those of the two sexes so 

 different in- aspect that without positive evidence it would have 

 been difficult to suppose th§m to belong to the same plant. The 

 Mexican ones have been very well described and one of them 

 figured by Fournier, who, from his specimens, supposed them to 

 be strictly dioecious ; but we have specimens with the two in- 

 florescences upon different branches of the same individual. 



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