CLXXITI. GRAMINEJ;. (J. D. Hooker.) 5 



Spikelets 2-3-nflte, in a simple spike, gl. I with tuber- 



cled p. nicillate ribs ....... 50. ELIOXCEUS. 



Spikelcts solitary, terminating the branches of a thyrsoid 



panicle ......... 51. CLKISTACUNK. 



Spikelet-; capitate, ma!-' -'ssilp, 2-fld., forming an involu- 



crifonn whorl round the prdicelled t'etn. . . . 52. GERMAINU. 

 Spikelets 2-natc, or the uppermost 3-uate, spicate, or 



])anicled ....... .53. ANDROF' 



Spikelets in 2 superposed series* ; upper series of het- 



us pairs, and a terminal male, lower a whoil ut' 



:.t males or neuters '. . . . . r>l. AXTHISTIUIA. 



Spikelets as in Ant hist ir-> a, but male and neuter spikelcts 



deciduous with the fern. ; callus . . . . o5. ISKII.KMA. 



Series B. Poaceee. Spikelets continu6us (not articulate with) their 

 pedicels, 1- inany-tid. ; rachilla articulate at the base, and often bet\, 

 the Hg. gls. ; lowest H. always fruiting, upper often male or neuter. 



tl. alone bisexual in Phalaridea?. Spikefets articulate on 



tlii-ir pedicrls, or gl. 1 and 11 sr;, natn y dt oiduous occur in U, Melica, 



Finuerlnithia, Cyatkof *, and tiphuerocaryon. See under Panicacew some geuent 

 with spikflets inarticulati; at the base. 



Tribe V. PHALARIDEJB. Spikeh-ts with a terminal perfect fl., and one or 

 more imperfect male or neuter below it; rachilla not produced bt-yond the 

 perfect H. 



Panicle contractpd or spiciform ; ppikelets awnless . . 56. PnALARIS. 

 I'aniclc spirif.irm ; gla. 6, 111 and JV neuter, awned ; 



stami-ns 2 ......... ."7 MUM. 



Panicle lax.; gls. 6, III and IV male, awned or not . 08. II IKK... HLOA. 



VI. AGROSTIDK F.. S^iMcta 1-fld. ; rachilla j<. int. ! at the 

 base, produced or not beyond the tig. gl. ; gls. 3,1 and II empty, 111 

 flg. awned. 



i-pptions. Spikclet* sometimes 2-fld. in Sporobolv.t and MueJilenberyia. 



Subtribe I. S: ^/'ikrlef* panicled ; rachilla not produced beyond 



gl. Ill ; fl. gl. rigid or hard, awned (except Miliutn). 



Cl. Ill narrow, awn 3- fld ....... .",(). A RI8TIDA. 



Gl. HI narrow, awn entiM-, grain terete ... . ' 



(il. Ill bmadcr, awn entire, L'rain dorsally compressed . 



Gl. Ill obovoid, awn 0, grain oblong .... 62. MILIUM. 



Subtribe II. PHLKDHM. R. >'yi/X-< / ts in spiciform or subspiciform panicles, 

 gl. Ill hyaline, loosely wrapping the grain; stigmas exserted from the 

 top of the spikelet. 



* Eachilla produced beyond the f.g. gl. 

 Gl. I and II shorter than 111 ...... G3. Ui I.IOCITLOA. 



Gl. I and II longer than III ...... 61. I'IU.KUM. 



** Rachilla not produced. 



Gl. I and II longer than III ; panicle cylindric . . 65. ALOPFCFRUS. 

 Gl. I and 11 minute; panicle laxly subspiciform ( . . 60. Pnir; 



Subtribe III. EUAGROSTE.E. Spikelets usually small, in open or con- 

 tracted many-fld. panicles; gls. usually thin or membranous; stigmas 

 laterally exserted from the spikelet. Spikelets rarely 'J-tid. in N 

 and Muehlenbtryui. 



