evil. GIUMINEiE. 523 



C. Stamens 3 (very rarelt/ 1) in some or all of the florets. Styles or 



Stigmas 2, 



a, Spikelets pedicellate, panicled. Panicle often very compact^ so as to re- 



semhle a spike, 



* Spikelets ivith a single perfect floret; imperfect florets Q \ neuter ones, when 

 present, either rudimentary or consisting of empty glumellas, much 

 smaller than the perfect one, 



4 



f Glumes 0. 



3. Leersia. Panicle spreading. Spikelets laterally compressed, 



keeled, awnless. (jlumellas inclosing the caryopsis, lower one 

 much the larger. 



* It Glumes 2. 



X Panicle spiked. Glumes as long or longer than the floret. 



4. Alopecurus. Glumes usually connate at the base. Glumella 1, 

 with a dorsal awn ; neuter florets 0, 



5. PiiALARis. Glumes strongly keeled. Glumellas 2, awnless, glabrous 

 ^ or equally pubescent, at length hardening and inclosing the cary- 

 opsis. Neuter florets 1—2, rudimentary, coriaceous, and scale- 

 like. 



6. Ammophila. Glumes keeled, awnless, diverging. Glumellas 2, 

 ■ subcoriaceous below, and with a tuft of short silky hairs at the base. 

 ' Neuter floret 1, coriaceous, rudimentary and scale-like. 



* 7, Phleuk. Glumes pointed, or with a short terminal awn, parallel. 



Glumellas 2, membranaceous, awnless. Caryopsis free. 



8. Lagurus. Glumes tapering into a long subulate point, fringed to 

 ' the end. Glumellas 2, membranaceous ; outer one with two termi- 



j ' nal bristles, and a dorsal jointed awn. 



10. Gastridium. Glumes membranaceous, acute, entire, a-wnless, ventri- 



cose at the base. Glumellas 2, membranaceous, truncate or toothed 

 at the end, with a long straight awn below the point. 

 12. PoLYPOGON. Glumes notched at the end, with a long straight awn. 



Glumellas unequal; outer one obtuse, awned almost at the very 

 extremity. 



/ 



XX Panicle lax, spreading or contracted (not spiked), 



§ Glumes as long or longer than the floret. 



I Spikekt or floret broader than thick (dorsally not laterally compressed:). 



9. Milium. Panicle spreading. Glumes herbaceous, flattish on the 



back. Glumellas glabrous, awnless, at length hardened and in- 

 closing the caryopsis. Neuter floret 0. 



I nil Spikelet or floret either rounded on the hack (or laterally compressed). 



11. Stipa. Panicle erect. Glumellas cartilaginous, outer one involute, 



ending in a very long twisted awn, which is jointed at the base 



and finally separates at the joint. 

 .5. Phalaris. Panicle somewhat contracted. Glumes keeled. Glu- 



mellas uniformly hairy, awnless, at length hardened on the 



caryopsis. 



\ 



