b GRASSES OF SCOTLAND. 



* * * * Calyx containing three or more Florets. * 

 44. CYNOSURUS. — Inflorescence racemed, unilateral, with a pec- 

 tinated involucre at the base of each spikelet. Florets tipped with a 

 rough awn. Two species. (Plate XXVIII.) 



46. DACTYLIS.— Panicle tufted. Calyx hairy. Florets tipped 

 with a short awn. One species. (Plate XXIX.) 



47. ARUNDO. — Panicle large and spreading. Florets not awned. 

 Inner palea half the length of the outer palea. Footstalk of the se- 

 cond floret with very long hairs. One species. (Plate XXIX.) 



48. TRIODIA. — Florets not protruding beyond the calyx, without 

 awns. Sheaths of leaves crowned with a tuft of hairs. One species. 

 (Plate XXX.) 



49. BRIZA. — Florets not awned, obtuse. Outer palea without la- 

 teral ribs, broad, lobed at the base. Glumes obtuse, nearly equal, three 

 ribbed. Panicle spreading. One species. (Plate XXX.) 



50. HIEROCHLOE. — Florets not more than three in each spikelet, 

 not awned, hairy, not protruding beyond the calyx. Glumes broad, 

 acute, nearly equal, without lateral ribs. One species. (Plate XXXI.) 



51. POA. — Florets not awned, hairy or woolly at the base or keel. 

 Large glume three-ribbed. (Plates XXXI. to XLII.). Florets not 

 hairy, five-ribbed, tipped with a very minute point. Glumes three- 

 ribbed. (Plate XLII.). Florets not hairy, tipped with a very minute 

 point. Glumes without lateral ribs. (Plate XLIIL). Florets not 

 hairy, acute, three-ribbed. Glumes narrow without lateral ribs (Plate 

 XLIV.). Florets not hairy, seven-ribbed. Glumes without lateral 

 ribs. Eighteen species. (Plates XLIV. XLV.). 



* Exceptions. Some species belonging to the two tioret division have occasionally 

 three florets, viz. Mclica nutans — florets not longer than the calyx, without awns ; out- 

 er palea seven-ribbed ; glumes five-ribbed. (Plate XVIII.) ATolinca cccrulea— Carets 

 much longer than the calyx, not awned ; outer palea three ribbed ; glumes three-ribbed. 

 riate XX.) Aira cws^itosa — lower floret shorter than the calyx, awned from a little 

 above the base. 



