28 TRIANDRIA DIGYNIA. [CI. 3. 



58. ROTTBoLLIA. Hard-grass. 



1. R. incurvdta, 11. 760. (Sea H.) Spike cylindrical, tapering. 



Calyx-valves combined below. Floret solitary. Corolla awnless. 



Maritime past. 0.8. Stems branched. Sp. incurved, cylindr. 



59. ELYMUS. Lyme-grass. 



1. E. arendrius, 24. 1672. (Sea L.) Spike upright, close; main 



stalk not winged. Calyx lanceolate, the length of the spike- 

 lets. Leaves spinous-pointed. 

 Sandy sea-shores. If. . 7. 4 f, glauc. Stip. very short. Sp. 7 — 10 in. 



2. E. geniculdtus, 23. 1586. (Pendulous L.) Spike bent perpendi- 



cularly downward, lax; main stalk winged. Calyx awl-shaped, 

 longer than the spikelets. Leaves spinous-pointed. 

 Marshes near the sea, rare. If. . 7. Taller, but slenderer. Sp. 1 \ — 2f. 



3. E. Europceus, 19. 1317. (Wood L.) Spike erect. Florets about 



two, rough, awned, as well as the calyx. Leaves flat, pliant. 

 Woods. "2^. 6. Dark green. 2f. Upper florets often solitary. 



60. HoRDEUM. Barley. 



1. H, murinum, 28. 1971. (Wall B.) Lateral flowers barren; calyx- 



valves of the intermediate one lanceolate, fringed. 

 Waste gr. . 6 — 8. Stems recumb. at the base. L. rough,dark green. 



2. H. pratense, 6. 409. (Meadow B.) Lateral flowers imperfect, with 



shorter awns. All the calyx-valves bristle-shaped and rough. 

 Moist past. 2f . 6. Stem erect, 18 in. Leaves roughish. 



3. H.maritimum, 17. 1205. (Sea B.) Lateral flowers imperfect, with 



shorter awns ; the inner valve of their calyx half-ovate. 

 Mead, and sandy shores, ©. 6, 7. Like the first. L. smoother, 

 and more glauc. Awns very rough, with minute bi'istly teeth. 



61. TRlTICUM. Wheat, or Wheat-grass. 



1. T.junceum, 12.814. (Rushy Sea W.) Calyx-valves blunt, many- 



ribbed. Florets about five, awnless. Main-stalk smooth. Leaves 

 involute, sharp-pointed. Root creeping widely. 

 Sandy sea-shores, If. . 1. Glaucous, rigid. Stem purp. at the base. 



2. T. repens, 13. 909. (Creeping W., Couch-grass.) Calyx-valves 



pointed or awned, lanceolate, many-ribbed. Florets about five, 

 sharp-pointed or awned. Leaves flat. Root creeping. 

 Waste and cult. gr. If. 6 — 9. Straight and slender. Leaves rough 

 on the upper side ; glaucous near the sea. 



3. T. caninum, 20. 1372. (Fibrous-rooted W.) Calyx-valves some- 



what awned, with three or five ribs. Florets four, awned. 

 Leaves flat. Root fibrous. 

 Woods on a chalky soil. If. 7. Slender, straight, green. L. rough. 



4. T. cristdtum, 32. 2267. (Crested W.) Calyx-valves elliptical, 



awned, keeled, obscurely ribbed. Florets awned. Spikelets 

 closely imbricated, depressed, straight. Stems simple. 

 Marit. cliffs in Scot., a doubtful native. If. . 7. Slender, rigid, 1 — 1^ 

 f L. hairy above. 



