OLiii. graminej:< 1809 



,TBl6ii: IV. Andropotfoneae — SpikeUti mually inate, or theteninnalin the inflorescenct 

 3-nate pairs Jwmo or heUrogamous. Flowerimj (ilume mailer than the empty, hyaline, often 

 awned or reduced to an awn. ^ " " ' ■' 



SuBTiiiBE 1. MCa.ydemi—Spiltele.ts iplaate, all 1-iexiial; males spikes in terminal vanldes 

 or eonttmtoiis mth the female spike. 



Fruiting spikelets enclosed in a stony, nut-I ke polished glume . . 26 *Ooix 



Fruiting spikelets below the males, the glume very hard and smooth . . '. 27 Poi.yioca 



Spike etsl-senate. 28. 'Buohl^na. 



Spikelets many-senate 29, Zea. 



SuBiBiBE ^2. lilmerlese.— Spikelets honmgamout, secimd on a slender inarticulate rhachis, 

 I ■ flowered, dmndrous 30. Dimebu. 



SuBTMBi? 3. aa,echa,Tea.—SpikeUts homogamous, in eompomd racemes or panicUs 

 [except Pollmia) ; 1st glume not sunk in a hollow of the rhachis, 



• Pihachis not or rarely fragile. 



Spikelets in a oylindi-ioal silvery thyrsus, l-flbwerod, not awned . , , . 31. Iuperata. 



** Rhachis fragile. 



Spikelets in geminate digitate ol fasoioulate spikes 32. Poixinu. 



SuBiBiBE 4. Xaclieiaese.— Spikelets mamj, in solitary diqitate or fasciculate spikes 

 usually heteromorphous ; 1st glume not sunk in a hollow of 'the rhachis (see Pollinia in 

 Sacohareee.) 



* Margins of 1st glume of sessile spikelet inflexed. 



Spikes rarely solita,Ty ; spikelets 2-nate, 2-flowered, awned ..... . 33. l8CHa:iicM 



Spikes solitary ; spikelets 1-flowered, 1st glume pectinate 34. Ebbmochioa. 



•* Margins of 1st glume of sessile spikelet not inflexed.) 



Spikes solitary ; spikelets 2-nate, 1 to 2-flowered, 2awned 35. Pooonatheeum 



Spikes 2-nate or digitate ; spikelets l-floweced 36. Abthraxos. 



Subtbibe 5. KyVaAote.— Spikelets 3 on an inarticulate rhachis. . . 37. *Apotda. 



Sdbtbibe 6. BrOttboellleaB. — Spikelets homo or heterogamous, 1 to 2-floivered, solitary 

 or 2 rarely S-Jiate, on the interiwides of an articulate spike or raceme, not awned; 1st glume 

 not keeled, adnate to or sunk in a depression formed by the intermode and pedicel of the upper 

 spikelet ; glumes of sessile spikelet 4. 



Spikelets 2-nate, 1st glume flat 38. RottboEt.lia. 



Spikelets 2-nate, 1st glume gISboae 39. Manisueis 



Spikelets 2-nate, 1st glume appressed covering the cavity of the rhaehis. 40. IIiMAUTHniA. 



Spikelets solitary 1st glunifr convex 41. OpnrcEus. 



SuBTRicE 7.- EntLndTOposouem.—Spilelets heterogamous, l-floimred, 2-rareli/ S-nate 

 on the whorled articulate branches of simplii or compound racemes or panicles; glumes 4, 1st not 

 keeled, itlt usually awned. 



Spike densely silky-hairy; first glume of the ^ssile spikelet 2-lobel; 



pedicellate spikelet barren 42. Elionurus. 



Spike single ; spikelets unisexual, the awned females turned to one side ; 



the awnless riiales imbricate behind them 43. Hktehopoooj. 



Spikes .solitary digitate or several nearly sessile on a simple rhaehis ; 



sessile spikelet 1-flowered and fertile, pediceHfite one riiale or neuter . 44. Ammopoaos. 

 ' Panicle loose, fertile spikelets awned. 



1st glome either membranous or narrow and rigid with 2 prominent often 

 muricate lateral nerves 45. Chrysopogon. 



1st glume when in fruit hard, smooth and shining, ovate or lanceolate . . 46. Soeghom. 



Spikelet in 2 superposed series; upper series of heterogamous pairs, and a 

 terminal male, lower a whorl of 4 persistent males or neuter 47. Asihistikia. 



Spikelets as in Anthistiria, but male and neuter, spikelets deciduous with 

 the female ; callous none 48. Iseilema. 



Series B. VotiC^te.— Spikelets continuous (not articulate with) their pedicels, 1 ta many- 

 flowered ; rhachilla articulate at the base and often between the flowering glumes ; lowest Uower 

 always fruiting, tipper often male or neuter. 



KxcEPTio!;s. — ^Upper flower alone bisexual in Phalaridea. Spikelets articnlate on their 

 pedioelBT or Ist'and 3nd. glumes separately deciduous occur in Alopecurus. 



