THE GENERA AND THEIR SPECIES. 



135 



25^ 



1 " Poly pogonliUor alts. \ 

 Spikelet.^ For Floret 'see p.~45. 



bent at first, rooting at lower 

 nodes, then erect, slightly branched, 

 smooth; nodes smooth. Leaves 

 flat, narrow, short, stiff, rough, 

 glaucous. Sheaths smooth, striated, 

 uppermost longer than leaf ; ligule 

 downy, long, acute, prominent. 

 Spike well branched, glossy, pur- 

 plish. Spikelets flat, small, numer- 

 ous, one floret. Glumes equal, 

 narrow, linear-lanceolate, hairy 

 keel toothed, with long awn from 

 near the apex. Outer palea shorter 

 than glumes, notched at apex with 



long awn in the notch ; inner palea shorter than outer, notched 

 at apex, thin, awnless. 



Psamma. Plate x. AGROSTIDBM. 



31. arenarta 36 in. Marram. Spike pale yellow, about five 



inches in length. 

 Sandhills on the coast, ranging throughout Europe and North 

 America. July and August. Root perennial, creeping deeply and 

 extensively, rootstock yellow, smooth, fistulose, with white, 

 woolly fibres from joints. Stem erect, smooth, hard, bare at 

 top and often horizontal in the ground. Leaves reversed at 

 base, long, rigid, narrow, concave, prominently furrowed above, 

 ridges alternate, smooth below, glaucous. Sheaths long, striated, 



convolute ; ligule long, lanceolate, 

 deeply cleft. Spike fusiform, straw- 

 coloured. Spikelets lanceolate, acute, 

 crowded, with one floret. Glumes 

 nearly equal, the outer the larger, 

 obtuse, narrow, rigid, outer with one 

 rib, inner with three ribs. Outer palea, 

 linear -lanceolate, with four or five 

 ribs, rigid, notched, pointed, keel 



Psamma arenaria. . 



Spikeiet. For Floret see P . 47 . bns %» hail 7 at base ; inner palea 



