BEiCHTPoDrcnt. — iehicum:. 435 



2. B.pmndtum(B6a.xiY.); spike erect, spikelets (at first) terete 

 alternate disticlious, awnji of the upper fl. shorter than their pales, 

 1. flat linear-lanceolate rigid, creeping. — E. B. 730. P. 182 — 

 137. — St. several, erect, 1 — 2 feet high. Pales rough or hairy. 

 Sheaths subglabrous. Ligule short, truncate. L. not cUiate. — 

 Sometimes the 1. are very narrow and involute, st. very many, 

 spikelets small smooth. — On dry limestone soU. P. VII. E. 



46. Tkit'icum Linn. Wheat-grass. 



1. T. caninum (Huds.) ; spike rather close, spikelets 2 — 5-fl., 

 3 — 5-ribbed gl. and lower pales awned, axis and edges of the 

 rachis hispid, 1. flat rough on both sides, root Jibrous. — E. B. 

 1372. P. 62. — St. erect. Kibs on the upperside of 1. very 

 slender. Gl. round on the back, its ribs reaching the tip and 

 joining to form the short awn. Lower pale shorter than its 

 awn ; or in an alpine form longer than it. — Banks, rare. 



P. vn. E. s. I. 



2. T. ripens (L.) ; spike rather close, gl. 5 — 7-ribbed equalling 

 at least f of the 4—5-fl. spikelet rough on the keel, lower pale 

 acuminate, axis asperous, rachis with rough angles not brittle, I. 

 mostly flat the many slender ribs each bearing a row of deciduous 

 hairs above, soboUferous. — E. B. 909. P. 62. — Ribs on upper 

 side of 1. not much raised nor nearly hiding the interm. surface 

 of the leaf Rachis glabrous or downy with forward prickles on 

 the angles. Gl. scarcely keeled, acuminate-subulate ; ribs 

 reaching the tip. Pales rarely awned. — Common. j3. Sea- 

 shores. P. VI. Couch-grass. E. S. I. 



3. T. pun' gem (Pers.) ; spike close, gl. with 7 — 9 thick ribs 

 not exceeding J the 8 — 12-fl. epikelet rough on the keel, lower 

 pale acute, axis asperous, rachis nearly or quite smooth not 

 brittle, I. with involute edges the many thick closely-placed ribs 

 slightly rough and each bearing a row of acute points above, 

 upper part of 1. wholly involute (subulate and rigid), soboli- 

 ferous. — Sy. E. B. 1811. — St. erect. Ribs on upperside of 1. 

 80 broad and so elevated as nearly to hide the interm. part of 

 the leaf. Gl. keeled ; ribs reaching the tip^ Lower pale of our 

 plant often awned. Producing erect barren leafy clustered 

 shoots. Sea -shores. P. VII. E. I. 



4. T. aciitum (DO.) ; spike rather close, gl. with 5 — 7 slender 

 elevated ribs blunt or apiculate not exceeding f of the 6 — 8-fl. 

 spikelet, lower pale blunt mucronate, axis downy, rachis smooth 

 or slightly rough at the angles not brittle, 1. flat or with involute 

 edges the many thick closely placed ribs rough with minute sharp 

 points (asperous) above, soboliferous. — Sy, E. B. 1812. T. laxum 

 Fr. — St. prostrate or ascending. Bibs of the 1., on each of 



V 2 



