MONOCOTYLEDONS. GKAMIN&E. HolcitS. 165 



* Glume \-fowered (Calamagrostis). 

 j" Perianth awned. 



1. A. Calamagrostis, panicle erect diffuse, glumes acuminate, 

 perianth with a small terminal awn shorter than the glume and 

 the tuft of hairs, p. 27. Shady places. 



2. A. stricta, panicle erect close, glumes acute, perianth about 

 as long as the glume longer than the tuft of hairs with a dorsal 

 awn equal to it in length, p. 27. Marshes, rare. 



ft Perianth awnless. 



3. A. arenaria, panicle spiked, glumes acute, perianth as long as 

 the glume thrice as long as the tuft of hairs, leaves involute 

 pungent, p. 27. Sandy sea-shores. 



** Glume many -flowered (Arundo). 



4. A. Phragmiies, glume ahout 5-flowered, florets longer than 

 the glume, p. 27. Watery places. 



11. ROTTBOLLIA. 



Glume of 2 valves, 1 -flowered, valves lateral. Flowers alternate, 

 ranged upon a jointed rachis. 



1. R. incurvata, spike filiform or awl-shaped, glume 2-valved. 

 p. 46. Sandy sea-shores. 



12. HORDEUM. 



Glumes standing three together, 2-valved, 1-fiowered; valves la- 

 teral; intermediate glumes perfect, lateral ones with anthers or 

 pistils. Perianth 2-valved, awned. 



1. H. murinum, valves of the glumes of the intermediate floret 

 linear-lanceolate ciliated, those of the lateral florets setaceous 

 scabrous, p. 46. Waysides. 



2. H. prate?ise, valves of the glumes all setaceous scabrous, p. 46. 

 Pastures, rare. 



3. H. maritimum, valves of the glumes smoothish, the int. one of 

 the lateral florets semi-lanceolate, the rest setaceous, p. 46, 

 Sea- coast, rare. 



B. Glume 2-, rarely ^-flowered, 



13. HOLCUS a . 



Glume 2-valved, 2-flowered, nearly equal. Perianth 2-valved. 

 Florets dissimilar, polygamous, one awned, the other awnless, 

 without any imperfect one between them. Caryopsis free or 

 enveloped in the membranaceous perianth. 



a Hole us thus characterised is very different from the Holcus of Mr.. Brown, 

 and most of the Linnaean species, which constitute the genus Sorghum of 

 Persoon, and do not belong even to this section, but to Paniccce. 



