164 MOKOCOTYLEBONS. — GRAMINEi?:. Avundo. 



1. PHLEUM. 



G///7we 2-valved, 1 -flowered ; yo/ye^ nearly equal, acuminate or 

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

 ops'is free. 



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

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

 Pastures. 



2. Phi. alp'mum, spike ovato-oblong, glumes truncate mucronato- 

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

 Alps. 



3. Phi. Michel}!, 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 seashores. 



8. MILIUM. 

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

 ed with the permanent, hardened perianth. 

 I. M. effusumj flowers loosely panicled awnless. p. 24. — Woods. 



9. AGROSTIS. 



Glume 2-valved, 1-flovveredj 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 a longish awn from the base, inner one ovate 

 very minute, leaves setaceous, p. 25. — Heaths P 



** Perianth awnless {or inostlij so) . 



5. 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, isi'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-vaIves, 1-flovvered (in A. Phragmites many-fl.). Pe- 

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

 vered with the perianth. 



