11 



• "To aid the render in finding the true name of an unknown specimen of gra*s. the 

 following arrangement will be found to be very convenient, and easily understood. 



Let the tlowers of the grass he first examined. If hut one is found in each spl'kt let re 

 Ur t<> number J. of the left hand eoluinn. and then exarnine and see whether they are 

 arranged in panicles or spikes; if the former, then refer to number ;! of the left hand 

 column, and see whether they are awned or not. If uwncd. refer to numher 1, if with- 

 out awnfl, to numher 12, of the left-hand column. If nwncd, and having two glumes 

 refer to 18, and soon. If without flumes and aquatic, it is Ziznruti, or wild rice. 



If in the first examination the spikelets are found to have two or more flowers, refer 

 lO number 26, ol tne left hand column. and see whether the Inflorescence is in panicles 

 or spikes. If the former, refer to 27, of the left-hand column. If the latter, in spikes 

 refer to 89, and then see whether the spikelets are two-rowed, or one-sided. If the lat- 

 ter, refer to 45, and see whether the spikes are digitate and the spikelets in two rows. 

 If they are. refer it to the genua E'cusiiK. 



Rut little practice will he required to gain familiarity in thus analyzing the flowers 

 of the grasae* 



L Spikelets with but one flower, 2 



1 •• with two or more flowers _ 26 



j. F'.owcrs arranged in panicles 3 



2. Flowers in spikes 16 



J. With awns. - 4 



i Without awns 12 



1. Grhunei large. - 5 



4. Glumes minute, unequal, one hardly perceptible 11 



4. Glumes none, grassaquatie — — Zizania_ 



".. Without abortive rudiments 6 



i. With an abortive rudiment of a second flower _ — Holcus 



6. Paleae two, 7 



6. Paleae three, upper awned flowers polygamous „. — Sorehum. 



7. Palea with one awn 8 



7. Lower palea with three twisted awns — Aristida. 



8. Paleae cartilaginous or gristly 9 



8. " herbaceous, 10 



8. " membranaceous, panicle open — Agrostis.. 



8. " " " contracted — Polypogon 



9. Flowers sessile, or joined to the stem at the base, , — Oryzopsis- 



9. Flowers stipitate, fruit black _ — Stipa 



10. Flowers- naked, with one stamen _ 9— Cinna 



10, Flowers hairy, stamens three — Calamagrostis or Deyeuxia 



11. °tamens three — M.uhlenbergia 



11. •• two — Bracbyelytrum 



12. Glumes two, 13 



12. Glumes none, leaves rough from the end backwards, — Leersia 



18. Paleae membranaceous, 14 



13. Paleae leathery, spikelets all cauline —Milium. 



13. Paleae leathery, fertile >*pikelets radical — Amphicarpum 



14. Fruit coated, or covered with ahusk, 15 



14. Fruit naked, — Sporobolus, 



15. Flowers stalked, —Agrostis. 



l.">. Flowers sessile, — Vilfa ox Sporobolus 



16, Flowers awned — ~ — — 17 



16. Flowers without awns, - 22 



17. Spikes solitary 18 



17. " many, awnless, unilateral, paleae cartilaginous, — Panicum 



17. " two, fertile, — Erianthus 



17. •' two, polygamous, sterile flowers bearded, ,.— Andropogon 



18. Spikes simple, or nearly so, 19 



18. " paniculate, or lobed, 2 



19, Involucre none, 20. 



1'i. Involucre of two or more bristles — Setaria. 



