164 MONOCOTYLEDONS. GRAMINE/E. 



7. PHLEUM. 



Glume 2-valved, 1-flowered; valves nearly equal, acuminate or 

 mucronato-aristate, including a single awnless perianth. Cary- 

 opsis free. 



1 . Phi. pratense, spike cylindrical, glumes truncate mucronato- 

 aristate ciliated at the back longer than the awn. p. 23. 

 Pastures. 



2. Phi. alpinum, spike ovato-oblong, glumes truncate mucronato- 

 aristate ciliated at the back equal in length to the awn, p. 23. 

 Alps. 



3. Phi. Michelii, panicle spiked cylindrical, glumes lanceolate 

 acuminate strongly ciliated at the back. p. 24. Alps. 



4. Phi. arenarium, panicle spiked oblongo-obovate, glumes.lan- 

 ceolate acute ciliated at the back. p. 24. Sandy sea-shores. 



8. MIL1UM. 



Glume 2-valved, 1 -flowered ; valves ventricose. Caryopsis invest- 

 ed with the permanent, hardened perianth. 

 I. M. ejfusum, flowers loosely panicled awnless. p. 24. Woods. 



9. AGROSTIS. 



Glume 2-valved, 1 -flowered ; valves acute, compressed, awnless. 

 Perianth shorter than the glume, slightly hairy at the base. 

 Caryopsis free. 



* Outer valve of the Perianth awned. 



1. A. canina, branches of the panicle long slender erecto-patent, 

 valves of the glume unequal lanceolate rough at the back, pe- 

 rianth of 1 valve with a dorsal awn from below the middle, 

 leaves linear, p. 24. Heaths, &c. 



2. A. setacea, branches of the panicle short erect, valves of the 

 glumes unequal lanceolate rough at the back, outer valve of 

 the perianth with alongish awn from the base, inner one ovate 

 very minute, leaves setaceous, p. 25. Heaths ? 



** Perianth awnless (or mostly so) . 



3. A. vulgaris, branches of the panicle smoothish, branchlets di- 

 verging, outer valve of the perianth 3 -nerved, ligule extremely 

 short and truncate, p. 25. Pastures, &c. 



4. A. alba, branches of the panicle hispid, branchlets patent, 

 outer valve of the perianth 5-nerved, ligule long. p. 25. 

 Waste places. 



10. ARUNDO. 



Glume of 2-valves, 1 -flowered (in A. Phragmites many-fl.). Pe- 

 rianth surrounded with long hairs. Caryopsis free, but co- 

 vered with the perianth. 



