Ord. 3.] TRIANDRIA DIGYNIA. 23 



/2. P. csesia, 24. 1719. Florets 4 or 5. Leaves rather broad. 

 Mountains. If.. 6,7. Of a purp. glauc. hue. Rootfibr. 

 9. P. nemordlis, 18. 1265. (Wood M.J Panicle spreading-, capillary. 



Calyx-glumes lanceolate, taper-pointed, each three-ribbed. 



Spikelets lanceolate. Florets about three, five-ribbed, acute ; 



silky at the keel and lateral ribs ; hairy at the base, without a 



web. Stipulas very short, notched. 

 Woods. 2f. 6. Stems erect, slender, \ — H/. Spihel. small, pale. 



46. TRIoDIA. Heath-grass. 



1. T. decumbens, Poa decumbens, 11. 792. (Decumbent H.) Panicle 

 nearly simple, close, erect. Florets four ; their middle tooth 

 shortest. Calyx smooth. Stipula hairy. 

 Spongy bogs. If. 7. Leaves rigid, involute. Spikel. turgid. 



47. BRlZA. Quaking-grass. 



1. B. minor, 19. 1316. (Small Q.) Spikelets triangular, seven-flow- 



ered. Calyx longer than the florets. Stipulas lanceolate, very long. 

 Fields, S. of Engl., rare. ©. 7. Stem 6—8 in., branched at the 

 base. Pan. deep green. 



2. B. media, 5. 340. (Common Q.) Spikelets ovate, about seven- 



flowered. Calyx shorter than the florets. Stipula very short and 

 blunt. 

 Past. If. 5, 6. Stem 12—18 in., simp., solit. Pan. light brown. 



48. DACTYLIS. Cock's-foot-grass. 



1. D. glomerdta, 5.335. (Rough C.) Panicle distantly branched. 

 Flowers in dense globular tufts, unilateral. Corolla somewhat 

 awned, five-ribbed, taper-pointed. 

 Mead, and past. If. 6 — 8. L.flat, harsh. Spikes ovate, many-jl. 



49. SPARTlNA. Cord-grass. 



1. S. stricta, Dactylis str. 6. 380. (Twin-spiked C.) Spikes two or 

 three, erect, with very smooth stalks. Glumes downy. Outer 

 valve of the calyx smallest. 

 Muddy salt marshes. If. 8. Leaves involute, pointed, striated. 



50. CYNOSuRUS. Dog's-tail-grass. 



1. C. cristatus, 5. 316. (Crested D.) Spike simple, linear. Neuter 



spikelets without awns. 

 Dry past. If . 7. Stems erect. Stip. blunt. A valuable grass. 



2. C. echindtus, 19.1333. (Rough D.) Spike compound, ovate. Neuter 

 spikelets awned. Awns of the corolla full as long as the glume. 



Sandy pi. S. of Engl., rare. '©. 7. Stems branched at the base. 



51. FESTuCA. Fescue-grass. 



1. F. ovina, 9. 585. f Sheep's F.) Panicle unilateral, rather close. 

 Florets cylindrical, pointed or awned ; smooth at the base, and 

 at the edges of the inner valve. Stem square. Leaves folded, 

 bristle-shaped. 



