190 Appendix 



consists of from two to six (or more) simple, one-sided, digitate branches. 

 Glumes very unequal. 



Very common in all tropical and warm countries. It occurs as an 

 introduced weed of cultivation in the southern counties of England. 



Phleum asperum, Sm. Rough Cat's-tail Grass. 



An annual growing from 6 — 18 inches high. Rare in Britain. 

 It is distinguished from the other British species by its wedge-shaped 

 empty glumes which are rough along the keels — but not hairy. 



Phleum' Bmhmeri, Schrad. 



A perennial, very similar to P. pratense, but smaller. The glumes are not 

 awned but simply pointed, and the hairs are confined to the upper 

 half of the keels. The inner margins of the glumes are not fringed with 

 hairs. 



Sometimes met with in the eastern counties of England. Rare. 



Poa laxa, Hsenke. Wavy Poa. 



A slightly creeping perennial, 6 — 12 inches high, closely allied to 

 Poa alpina. Panicle loose. Spikelets few, on spreading branches, oblong- 

 ovate, 3 — 4-fl.owered. A native of high elevations in northern latitudes. 



In Britain it is only known to occur on Ben Nevis, where it is 

 generally in a viviparous state. 



Poa loliacea, Huds. A small annual about four to six inches high. 

 Panicle reduced almost to a simple spike of spikelets. Spikelets 6 — 10- 

 flowered, the flowers without a "web." 



Empty glumes acute and without lateral ribs. The outer palea 

 five-ribbed, the marginal ribs broad. Scattered around the coasts of 

 Britain on rocks and sands. 



Poa procumbens, Curt. 



A tufted annual, with decumbent stems six to twelve inches long. 

 Panicle secund. Spikelets 3 — 5-flowered. Empty glumes each with 

 three prominent nerves. The outer palea five-nerved. Flowers with- 

 out a "web." The whole plant glaucous. 



Waste places on our sea-coasts. Rare. 



Polypogon, Desf. Beard-grass. General characters of the genus: 



Spikelets one-flowered, crowded in a contracted and often interrupted 

 panicle. Empty glumes each ending in a fine straight awn. Outer 

 palea awned. 



Polypogon littoralis, Sm. Perennial Beard-grass. 



A procumbent perennial growing from six to twelve inches high. 

 Panicle moderately close. Empty glumes equal, hairy, strongly 

 toothed on their keels, and each bearing an awn about as long as the 



