MONOCOTYLEDONS. GUAMINEi^. Ho/cUff. 165 



* Glume \ -flowered (Calamagrostis). * 

 t 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. slricla, 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. — Mar sites, 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 -Jluicered (Arundo). 



4. A. Phragmiles, glume about 5-flowered, florets longer than 

 the glume, p. 27. — IVatery places. 



11. ROTTBOLLIA. 



Glume of 2 valves, 1-flowered, valves lateral. F/oj^'er^ alternate, 

 ranged upon a jointed rachis. 



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

 p. 46. — Sandy seashores. 



12. HORDEUM. 



Glumes standing three together, 2-valved, 1-flowered; 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. — IVay sides. 



2. H. pratense, 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 J rare. 



B. Glume 2-, rarely 3-Jlowered. 



13. HOLCUS^ 



Glume 2.valved, 2-flo\vered, 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. 



^ Holcits thus characterised is very diiferent from the Holcus of Mr .pj-own, 

 and most of the Linniean species, which constitute the genus Sorifmm of 

 Persoon, and do not belong oven to this section, but to Panicca: 



