310 APPENDIX. 



2. T. ripens (Linn.) ; spike'rather close ; glumes 5 — 6-ribbed, 

 equalling at least two-thirds of the 4 — 5-flowered spikelet, 

 rough on the keel; lower pale acuminate; axis asperous; 

 rachis with rough angles not brittle ; leaves mostly flat, 

 with many slender ribs, each bearing a row of deciduous 

 hairs above ; stoloniferous. 



T. repens, Eng. Bot. t. 909. Parn. t. 62. 



Stem erect. Ribs on the upper side of the leaves not much 

 raised, not nearly hiding the intermediate surface of the leaf. 

 Eachis glabrous or downy, with prickles on the angles pointing 

 forwards. Glumes scarcely keeled, acuminate -subulate ; ribs 

 reaching to the tip. 



/3 littoreum; glaucous, leaves involute, pales mucronate. 



Glumes more strongly keeled; pale blunt, although mucro- 

 nate ; otherwise like the type of the species. 



Waste and cultivated land, very common ; /3 near the sea. 



3. T pungens (Pers.) ; spike close ; glumes with 7 — 9 thick 

 ribs, not exceeding half the length of the 5 — 12-flowered 

 spikelet, rough on the keel ; lower pale acute ; axis aspe- 

 rous; rachis nearly or quite smooth, not brittle ; leaves with 

 involute edges, their many thick closely placed ribs slightly 

 rough, and each bearing a row of acute points above ; upper 

 part of leaves wholly involute (subulate and rigid) ; stoloni- 

 ferous. 



Stem erect. Ribs on the upper sides of the leaves so broad 

 and so elevated as nearly to hide the intermediate part of the leaf. 

 Glumes keeled, ribs reaching to the tip. Lower pale (of our 

 plant) usually awned. Producing erect, barren, leafy, clustered 

 shoots as well as the flowering stems. 



Sea-shores, common. 



4. T. actitum (DC); spike rather close; glumes with 5 — 7 

 slender elevated ribs, blunt or apiculate, not exceeding 

 two-thirds of the length of the 5— 8-flowered spikelet ; lower 

 pale blunt, mucronate ; axis downy ; rachis smooth or 

 slightly rough at the angles, not brittle; leaves flat or with 

 involute edges ; their many thick closely placed ribs rough, 



