( 488 .) 
TRIO'DIA * *. 
Linncan Class and Order. TRiA'NDRlAf, Digy'nia. 
Natural Order . Grami'neje, 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. 
Hurt. Brit. p. 542. — Mack. FI. Hibern. p. 294. — Hook. Brit. FI. 
(4th edit.) p. 426. — Gramina, Linn. — Graminales ; sect. Fes- 
tucin/E; type, Avenacea: ; Burn. Outl. of Bot. v. i. pp. 359, 
and 369. 
Gen. Char. Panicle somewhat racemose. Calyx (fig. 1.) of 
2 nearly equal, clasping, awnless, pointed, egg-shaped, concave, 
keeled glumes, containing an egg-shaped, imbricated, tumid spi/telet 
(see fig. 2.), about its own length, of several 2-ranked, perfect florets 
(see figs. 2 Ik 3.), variously hairy at the base (see fig. 3 ), but with- 
out any complicated web. Corolla (fig. 2.) of 2, rather unequal, 
egg-shaped, rigid, concave palese, closely pressed together trans- 
versely ; the outer obscurely many-ribbed, not keeled ; flat and 
expanded at the edges ; deeply cloven at the summit, with an 
intermediate dorsal tooth, or awn, longer or shorter than the lateral 
points ; inner smaller, lining the cavity of the outer, fringed ; cloven 
or notched at the point. Nectary (fig. 5.) of 2 scales. Filaments 
(see fig. 3.) 3, hair-like. Anthers prominent, pendulous. Germen 
(see fig. 4.) oval, flat. Styles (see fig. 4.) 2, short, distinct. Stigmas 
cylindrical, feathery. Seed (see figs. 6 — 8.) loose, oval, depressed, 
convex on the outside, concave on the inner, closely pressed between 
the unchanged paleae. 
The somewhat racemose panicle ; the calyx of 2 nearly equal 
glumes, containing 3 or more florets ; and the corolla of 2 paleae, 
the outer one with 3 nearly equal teeth, the middle one of which is 
straight; will distinguish this from other genera in the same class 
and order. 
One species British. 
TRIO'DIA DECUMBENS. Decumbent Heath-Grass, 
Spec. Char. Panicle nearly simple, close, upright Calyx- 
glumes smooth, containing about 4 florets ; the middle tooth of their 
paleae shortest. Ligula a tuft of hairs. 
Cray’s Nat. Arr. v. ii. p. 111. — Sm. Engl. FI. v. i. p. 131.— With. (7thed.)y. ii. 
p. 174. — Hook. Brit. FI. p. 44. — Lindl. Syn. p. 311. — Sincl. Hort. Gram. Wob. p. 
377. — FI. Devon, p. 17. — Johnst. FI. Berw. v. i. p. 24. — Winch’s FL of Northumb. 
and Durh. p. 6. — AValker’s FI. of Oxf. p. 24. — Bab. FI. Bath. pp. 57 and 100. — 
Murr. Northern FI. p. 65. — Dick. FI. Abred. p. 24. — Irv. Lond. FL p. 98. — Baines’ 
FI. ofYorksh. p. 120. — Mack. FI. Hibern. p. 306. — Danthonia decumbens. D.C. — 
Macr. Man. Brit. Bot. p. 268. — Bab. Prim. FI. Sara. p. 109. — Leight. FI. Shropsh. 
p. 53. — Festiica decumbens, Linn. Sp. PI. p. 110. — Leers’ FI. Herb. p. 34. t. 7. 
f. 5. — FI. Dan. t. 162. — With. 1st cd. v. i. p. 53. ; 2nd ed. v. i. p. 101. — Huds. FL 
Angl. (2nd ed.) p. 47. — Willd. Sp. PI. v. i. pt. I. p. 424. — Lightf. FI. Scot. v. i. 
Fig. 1. Calyx. — Fig. 2. Spikelet. — Fig 3. A Floret. — Fig. 4. Germen, Styles, 
and Stigmas. — Fig. 5. Nectary, — Figs. 6, 7, & 8. Seeds. — All, except fig. 6, more 
or less magnified. 
* From treis, Gr. three ; and odous, Gr a tooth ; alluding to the three teeth 
of the paleaj. -t- See folio 56, note t. 
