334 GLUMACE^E 



15. Phragmites (Reed) 



1. P. communis (Common Reed). A stout plant, usually 5-6 

 feet high or taller ; leaves often 1 inch broad ; panicle up to 1 foot 

 long, more or less drooping, often purplish brown ; spikclets about 

 I inch long, narrow, with the white silky hairs on the axis con- 

 spicuous in the fruiting stage. Wet ditches and marshes ; common. 

 Fl. August. Perennial. 



16. Ammophila (Marram-Grass) 



1. A. arenaria (Sea Marram-Grass, Murram- or Mat-Grass). 

 Commonly known as Psamma arenaria. Rootsiock far-creeping ; 

 stems stiff, 2-3 feet high ; leaves narrow, stiff, erect ; panicle 5-6 

 inches long ; spikclets crowded, nearly h inch long ; hairs on the 

 axis \ as long as the pale. Maritime sands ; frequent. An im- 

 portant sand-binding plant. Fl. July. Perennial. 



2. A. ballica has a longer and less compact panicle, the glumes 

 are more pointed, and the hairs on the axis of the spikelet are as 

 long as the pale. Northumberland and Norfolk ; rare. Fl. July. 

 Perennial. 



17. CALAMAGROSTIS (Small Real-Grass) 



1. C. epigeios (Wood Small Reed-Grass). Rootsiock creeping; 

 stems 3 or 4 feet high ; leaves l'ng, narrow, somewhat glaucous; 

 Panicle narrow, a few inches to 1 foot long ; spikclets nearly J inch 

 long ; outer glumes almost subulate ; hairs at the base of the 

 flowering glume longer than the glume. Damp, shady places, 

 frequent. Fl. July. Perennial. 



2. C. lanccolata (Purple Small Reed-Grass). Usually more 

 slender than C. epigeios ; panicle much looser, 5-6 inches long, 

 often shining purple ; outer glumes rather broader, about \ inch 

 long ; hairs longer than the flowering glume. Wet places ; rare. 

 Fl. July. Perennial. 



3. C. Hcglecia (Narrow Small Reed-Grass). Leaves stiffer than 

 in the last ; panicle very narrow, 4-6 inches long ; spikelets smaller ; 

 hairs much shorter than the flowering glume. Bogs in Cheshire, 

 near Loch Tay, and in Antrim ; rare. Fl. June, July. Perennial. 



4. C. strigosa. In Britain known only from Caithness. It is 

 more slender than C. ncglccta, and the glumes are distinctly longer. 



Fl. July. Perennial. 



18. Apera (Wind-Grass) 



1. A. Spica-venti (Silky Wind-Grass). A rather tall and very 

 elegant grass ; leaves rather narrow, flat ; panicle often 6-8 inches 

 long or more, usually spreading ; spikelets very small, shining ; 

 awn 3 or 4 fimes as long as the spikelet. Sandy fields ; rare- Fl. 

 June, July. Annual. 



