A SYNOPSIS OF THE VEGETABLE KINGDOM. 



75 



DD. Spikelets 2- co -fid . . 

 E. b'loweri n g gl ii m e 

 geuei'ally shorter 

 tban the empty 

 ones ; usually 

 with a bent awn 

 on the back rai'ely 

 awned from the 

 point or awnless. 

 When not awned 

 there are 2 nearly 

 opposite florets, 

 and the rachilla 

 is not produced 

 beyond them. ...9. Oat Tribe or 



AVENE.E. 



EE. Flowering glume 

 generally longer 

 than the empty 

 ones, unawned or 

 with a straight 

 awn from the 

 point (seldom be- 

 low) 10. Fesclte Tribe or 



Festl'ce.e. 

 cc. Spikelets crowded in 2 

 close rows, forming 

 a 1-sided spike 



raceme 

 tinuous 



ith 



con- 



11. Chloris Tribe or 



Chloride.e. 

 ccc. Spikelets in 2 (rarely 

 more) opposite rows 

 forming an equilater- 

 al spike (very rarel.v 

 unilateral) 12. B.irley Tribe or 



HOEDE.E. 



BE. Culm woody, at least at 

 the base, leaf-blade 

 often with a short, 

 slender petiole articu- 

 lated with the sheath 

 from which it tinally 



separates 13. B.\«iBoo Tribe or 



Bambuse^. 



1. Indian- Corn Tribe or Mayde^. 



A. Male spikes numerous in 

 terminal panicles, female 

 spikes in the axils of Ivs. 

 subtended by large mem- 

 branaceous bracts 



B. Female spikes of each 

 leaf-axil grown together 

 into a continuous, com- 

 pound, much thickened 



axis (the "ear") 1. Zea. 



BE. Female spikes of each 

 leaf-axil free, articu- 

 lated 2. Ecchl.ena. 



(See also Teosinte.) 

 aa. Male spikes solitary at the 

 ends of branchlets, fe- 

 male below, 1-2, each re- 

 duced to a single spike- 

 let which is entirely in- 

 closed by the ovate or 

 spherical, ivory-like 

 sheath of the subtend- 

 ing bract 3. CoiX, 



AAA, Male and female spikelets 

 in the same spike (at 

 least in the lateral ones), 

 the lowest empty glume 

 of the female spikelets 

 indurated 4. Tripsacum. 



2, SoRGHi'M Tribe or Andropogone.e. 



a. Spikelets hnmogamous, her- 

 maphrodite 



B. Axis of racemes continu- 



cus 5. Miscaxthus. 



BB. .Axis of racemes articulate. 



C. Spikelets awned 6. Erianthiis. 



cc. Spikelets unawned. ...7. Saccharum. 

 AA. Spikelets heterogamous, the 

 sessile hermaphrodite, the 



pedicillate male 8. Andropocon. 



(See also 9. Chryso- 

 pogon). 



3. ZoYsiA Tribe or Zoysie.e. 



4. Tristecine.e. 



Not cult, in .America. 



5. Panicl'm Tribe or Panice.!!. 



A. The spikelets forming very 

 short spikes which are 

 sunken into cavities of 



the one sided, broad axis. 10. Stenotaphrum. 

 AA. The spikelets neither sunk- 

 en in an excavation in the 

 rachis nor subtended by 



a large leaf-sheath 



b. Spikelets without any 

 special covering of 

 bristles or spines (ster- 

 ile branches) 



0, First and second empty 

 glumes without a dis- 

 tinct callus, awnless. 11. Panicum. 

 cc. First empty glume very 

 small and awnless, 

 the second apparent- 

 ly distant from the 

 first on account of a 

 conical or pedicel- 

 like callus, and like 

 the third flowering 

 glume of the male 

 floret) more or less 

 awned between the 



cleft apex 12, Teichol.ena, 



ccc. First and second empty • 



glumes awned 13. Oplismends. 



bb. Spikelets single or in 

 pairs, subtended by an 

 involucre consisting of 

 from one to many 

 bristles or spines (ster- 

 ile branches) which are 

 sometimes grown to- 

 gether 



14. Setaria, 

 c. Involucral bristles fall- 

 ing oft with the 

 spikelets at maturity 

 (cultivated forms ex- 

 cepted) 



D. Bristles num e r o u s, 

 rigid, thickened at 

 base, t r equently 

 grown together. ...15. Cexchrlis. 

 DD. Bristles usually num- 

 erous, apparently 

 whorled, delicate, 

 not thickened at 

 base, often plumose. 16. Pexnisetum. 



6. Rice Tribe ob Oryze.b. 



A. Spikelets unisexual : plants 



moncecious 17. Zizania. 



aa. Spikelets all hermaphrodite.18. Oryza. 



7. PnALARis Tribe or Phalaride.e. 



A. Third and fourth glumes 

 empty, reduced to small 



scales, awnless 19. Phalaris. 



AA. Third and fourth glumes 

 empty, small awned up- 

 on the back 20. ANXnoxANTiicM 



AAA. Third and fourth glumes, 

 or at least the third, 

 W'ith a male (1., almost 

 equaling the first and 

 second, awnless or short- 

 awned 21. HiEROCHLOfi. 



8. Agrosti.s Tribe or Agrostide.e. 



A. Flowering glume indurated 

 at maturity (at least 

 firmer in texture than the 

 empty glumes) and very 

 closely enveloping the 



fruit 



B. Awned 



/ 



