xxii GENERA. 



866. KNAPPIA. Pale scariose, shaggy, truncate ; the inner minute or wanting. Spike- 

 lets in a raceme, obscurely 3-rowed. Rachis cylindrical, iieed loose, with longitudinal dotted 

 lines, p. 401. 



861. POLYPOGOTJ". Glumes emarginate, each furnished with a long, slender seta, sca- 

 riose, including pales. Pales scariose ; the outer with a dorsal awn. p. 399. 



862. MILIUM. Glumes herbaceo-scariose. Pales membrano-coriaceous, nearly equal, 

 unarmed, hai'dening on the seed. p. 399. 



867. PIPTATHERITM. Glumes membranous. Pits, sessile. Pales subcoriaceous, 

 joined to a straight, terminal awn, hardening on the seed. p. 401. 



869. AEISTIDA. Glumes unequal, membranous, very narrow. Outer Pale coriaceous, 

 involute, with 3 awns ; inner wanting in the Sicilian species. Pales including the free seed, 

 p. 401. 



868. STIPA. Glumes scariose, herbaceous at base. Pits, stalked. Pales coriaceous, 

 hardening on the seed. A geniculate and twisted Awn joined at or near to its extremity, p. 401. 



870. ACHNATHERUM. Glumes scariose, herbaceous at base. Pale membranous. Awn 

 geniculate and tmsted, with a distinct, though slightly marked joining on to the outer pale, at 

 which it readily breaks off. p. 401. 



ix. Spikelets in a loose panicle, with a second imperfect Fit. 

 887. HOLCUS. Lower Pit. perfect, unarmed ; upper awned, generally barren, p. 406.' 



886. AERHENATHEKUM. Lower Fit. barren, with a geniculate awn ; upper perfect, 

 with a short straight awn. p. 406. 



853. HIEROCHLOA. Two outer Pits, barren, triandrous; middle perfect, diandrous, 

 all unarmed, p. 397. 

 Melica vMiflora. 



X. Spikelets scattered, with more than one perfect Fit. 



[Among these genera, Aira, Beschampsia, Danthonia, and Avena, are mostly awned, the awn 

 easily breaking away from the Pale ; and these are never furnished with a seta forming a mere 

 contiuuation of the midrib. In Trisetum and Koeleria it is diflBcult to decide whether we find an 

 awn or a seta. Dactylis, Bromus, and Cynosurus are setigerous ; Festuca often so ; and we 

 sometimes find a small mucro on the outer pale of Sesleria. The other genera are unarmed.] 

 a. Glumes nearly or quite as long as the spikelet. 



880. AIRA. Glumes 2-flowered, without rudiment. Awn, if any, dorsal, geniculate and 

 twisted. The Pales in some species harden on the seed, but without adhering to it. Fan. 

 equal, shining, p. 403. 



881. DESCHAMPSIA. Glumes 2-flowered, with usually, the not club-like rudiment of a third. 

 Outer Pale truncate, with a straight Awn from near the base, surrounded by soft hairs, p. 403. 



891. MELICA. Glumes nearly equal, larger than pales ; 1- or 2-flowered, with the stalked, 

 club-like rudiment of 1 or 2 more. Pales unarmed, membranous, hardening on the seed. p. 407. 



DANTHONIA. Glumes 2- or more flowered. Outer Pale smooth and coriaceous 

 below, membranous and nerved above, emargiuate, with an intermediate, broad tooth, which 

 sometimes terminates in a geniculate and twisted awn. p. 406. 



890. SCHISMUS. Glumes many-flowered, much larger than pales, membranous, ribbed, 

 with a scariose margin. Outer Pale similar, rounded at the end, except for a terminal notch. 

 F. de B. mentio'iis a terminal seta. p. 407- 



889. KCELERIA. Glumes and outer Pale herbaceo-scariose ; the latter entire, acuminate, 

 or with a terminal or subterminal, not geniculate seta. Spikelets ovate. Pan. often spike- 

 like, somewhat one-sided. Seed loose, p. 407. 



