CL. III.] TRIANDRIA DIGYNIA. 83 



5. P. trividlis. Roughish Meadow-grass. Panicle Spreading ; spike- 

 lets oblong, of about three acute, five-ribbed flowers, connected by a 



web ; straw and sheaths roughish ; root fibrous. From one to two 



feet high : leaves linear, acute : panicle large, with half-whorled, rough 

 branches, and green flowers. A valuable grass for pasturage and hay. 

 Perennial : flowers in June and July : grows in meadows and pastures : 

 very common. Eng. But. vol. xv. pi. 1072. Eng. Ft. vol. i. p. 124. 



160. 



6. P. pratiinsis. Smooth Meadow-grass. Panicle spreading ; spikelets 

 oblong, of about four acute, five-ribbed flowers, connected by a web ; 



straw and sheaths smooth ; root creeping. About a foot high : leaves 



linear, acute : panicle with half-whorled, smooth branches, and pale- 

 green flowers. One of the most valuable pasture plants. Perennial : 

 flowers in June and July : grows in meadows and pastures : abundant. 

 Eng. Bot. vol. xv. pi. 1073. Eng. Fl. vol. i. p. 126. 161. 



7. P. dnnua. Annual Meadow-grass. Panicle somewhat unilateral, 

 with spreading or deflected branches ; spikelets egg-shaped, of about five 

 somewhat distant, five-ribbed flowers, destitute of a web ; straw ascend- 

 ing, a little compressed ; root fibrous. Straws about six inches long, 



decumbent and rooting at the base : panicle pale-green. The whole 

 plant tender and rather succulent. Annual : flowers the whole year 

 round : grows by roads, and wherever there is loose earth : abundant. 

 Eng. Bot. vol. xvi. pi. 1141. Eng. Fl. vol. i. p. 126. 162. 



8. P. nemordlis. Wood Meadow-grass. Panicle spreading, with hair- 

 like branches; spikelets lance-shaped, of about three five-ribbed, acute 

 flowers, silky on the keel and lateral ribs, and hairy at the base, without 



a web. The whole plant slender and delicate : straws erect, about 



two feet high : leaves linear, flat, tapering to a fine point, roughish : 

 panicle erect. Perennial : flowers in June and July : grows in woods. 

 Eng. Bot. vol. xviii. pi. 1265. Eng. Fl. vol. i. p. 130. A small 

 glaucous variety, found abundantly on the Scotch and Welsh mountains, 

 has been named P. glauca, Glaucous Meadow-grass. Eng. Bot. vol. xxiv. 

 pi. 1720. Eng. Fl. vol. i. p. 128. 163. 



31. TRIO'DIA. HEATH-GRASS. 



Calyx of two nearly equal, egg-shaped, keeled, acute, awnless 

 chaff-scales, containing an egg-shaped, imbricated spikelet, of 

 several perfect flowers, which are hairy at the base, but destitute 

 of web. Corolla of two unequal, egg-shaped, stiff husks ; the 

 outer obscurely ribbed, rounded on the back, flat and expanded 

 on the edges, deeply cleft at the summit, with an intermediate 

 short awn or tooth ; the inner smaller, fringed, cleft at the point. 

 Nectary of two scales. Filaments hair-like; anthers protruded, 

 pendulous. Germen oval, flat. Styles short, distinct ; stigma 

 cylindrical, feathery. Seed loose, depressed, convex on the outer, 

 concave on the inner side. Named from treis, three, and adous, 

 a tooth. 47. 



1 . T. decumbent. Decumbent Heath-grass. Panicle erect, close, with 

 nearly simple branches; spikelets four-flowered; chaff-scales smooth. 



The whole plant stiff, decumbent; straw from four inches to a foot 



1 ong, smooth : panicle of a few large, purple spikelets : corolla with two 



