( 344 .) 
IIO'RDEUM* *. 
Linnean Class and Order. Tria'.vdria f, Digy'nia. 
Natural Order. Grami'neav, Juss. Gen. PI. p. 28. — Sm. Gram, 
of Bot. p. 86. ; Engl. FI. v. i. p. 71. — Lindl. Syn. p. 293. ; Introd. 
to Nat. Syst. of Bot. p. 292. — Rich, by Macgilliv. p. 393. — Loud. 
Hort. Brit. p. 542. — Mack. FI. Hibern. p. 294. — Hook. Brit. FI. 
(4th ed.) p. 426. — Gramina, Linn. — Graminales; sect. Triti- 
cinaj ; type, Hordeace.f. ; Burn. Outl. of Bot. v. i. pp. 359 & 362. 
Gen. Char. Spike imbricated. Rachis ( common receptacle J 
many-flowered, jointed, elongated, toothed alternately at each side, 
the intermediate spaces flattened, and bordered. Spikelets 1- 
flovvered, 3 at each tooth of the rachis (see fig. 1.), not all perfect, 
unequally stalked. Calyx (see fig. 2, a.) of 2 rather slender, vari- 
ously shaped, pointed or awned, parallel, upright glumes. Corolla 
(see fig. 2.) of 2 palere, the outer (fig. 2, b.) egg-shaped, concave, 
angular, terminating in a long, straight, rough awn, rising above 
the awn of the calyx ; inner palea (fig. 2, c.) smaller, spear-shaped, 
flat, indexed at the edges, pointed. Nectary (fig. 3.) of 2 pointed 
scales. Filaments (see fig. 2.) 3, hair-like, shorter than the palece 
(fig. 2, b & c). Anthers notched at each end. Germen (see fig. 4.) 
turbinate. Styles (see fig. 4.) very short. Stigmas (see fig. 4.) 
feathered along the upper side. Seed (fig. 5.) egg-oblong, pointed 
at each end, with a narrow channel along the upper side, firmly 
coated with both the paleae. 
The single-flowered spikelets, 3 together at each joint of the 
rachis, the central one only perfect ; and the calyx of 2 parallel 
glumes; will distinguish this from other genera with a spiked 
inflorescence, in the same class and order. 
Three species British. 
HO'RDEUM MURI NUM. Wall Barley. Way-side Barley. 
Mouse Barley. Way Bennet. Way Bent. Wild Rie. Rie-grass. 
Squirrel-tail Grass. 
Shec. Char. Glumes of the intermediate floret strap-spear- 
shaped, fringed ; those of the lateral florets bristle-like, rough. 
Engl Bot. t. 1971.— Cnrt. FI. Lond. t. 325. — Knapp’s Gram. Brit. 1. 104. — 
Host. Gram. Austr. v. i. p. 25. t. 32. — Mart. FI. Rust. t. 43 — Graves’ Brit. 
Grasses, t. 125. — Linn. Sp. PI. p. 126. — Muds. FI. Angl. (2nd ed.) p. 56. — Willd. 
Sp. PI. v. i. pt. i. p. 474.— Sin. FI. Brit. v. i. p. 155. ; Engl. FI. v. i. p. 179. — 
With. (7lh ed.) v. ii. p. 203. — Lindl. Syn. p. 296. — Hook. Brit. FI. p. 53. — IMacr. 
Man. Brit. Bot. p. 276. — Lightf. F). Scot. v. i. p. 108. — Sibth. FI. Oxon. p. 51. — 
Abbot’s FI. Bed f. p. 26. — Curt. Obs. on Brit. Grasses, (5th ed.) p. 29. — Davies’ 
Welsh Bot. p. 13. — Purt. Midi. FI. v. i. p.88. — Relh. FI. Cant. (3rd ed.) p. 50. — 
Hook. FI. Scot. p. 46. — Grev. FI. Edin. p. 32. — Sincl. Hort. Gram. Woburn, pp. 
27 fie 268, — FI. Devon, pp. 24 6c 121. — Jolinst. FI. Berw. v. i. p. 31. — Winch’s 
FI. Northumb. and Durh. p. 8. — Walker’s FI. of Oxford, p. 32. — Bab. FI. Bath. 
Fig. 1. A setof 3 Spikelets. — Fig. 2. A single Sterile Spikelet, or Floret ; a. the 
two glumes of the calyx ; b. the outer palea of the corolla ; c. the inner palea of 
ditto. — Fig. 3. The Nectary. — Fig. 4. The Germen, Styles, and Stigmas. — Fig. 5. 
A Seed . — All slightly magnified. 
* From horreo, to set up as bristles or hair through anger or fear ; in allusion 
to the ears of barley being conspicuously awned. Dr. Withering. 
+ See folio 56, note r. 
