134 THE SAND STBAND FLORA 



A. junceum Beauv. 

 Perennial grass, with pungent leaves, rigid ; roots extensively creeping. 

 Sea coasts of Europe and Northern Africa on drifting sands. 



A. repens L. var. litoreum Sehum. 



Perennial, with creeping jointed rootstock; stiff, ascending stems; 

 sheaths shorter than internodes. 



Common on coastal sands of Europe, Asia, and North America; also 

 in the interior of the latter continent. 



A. scabrum Beauv. 

 Common on dunes in New Zealand and Australia, but also inland. 



Agrostis alba L. var. maritima G. Meyer. 



Perennial, stolonif erous ; stems decumbent at base, 3 — 9 dm. high; 

 leaves rigid, glaucous, scabrous, 7 — 15 cm. long. 



Grows especially in moist places between the dunes. Baltic south 

 coast. 



Ammophila arenwria (L.) Link. 



Tall perennial grass, with long rigid leaves; creeping rootstock; 

 stems 6 — 12 dm. high, sheaths long; blades convolute and polished 

 without, scabrous and glaucous within. 



Coastal sands of Europe, Forth Africa, and North America. Intro- 

 duced to many other countries as an effective sandstay. 



A. baltica Link. 

 Is by most authors considered to be a hybrid of the former species, 

 which it resembles in habit, and Calamagrostis epigea. This is, how- 

 ever, not yet proved by experiments. Occurs on coastal sand dunes of 

 Northern Germany and Southern Sweden. 



Andropogon provincialis Lam. 



Perennial grass, with erect culms, smooth and glabrous, 10—15 dm. 

 high; leaves smooth, acuminate. 



Southern Europe, where often planted on dunes. A. furcatus Muhl. 

 is a North American form with a wide range along the eastern sea 

 board. By some authors, as Hackel, it is considered to be identical with 

 A. provincialis. 



Aristida plumosa L. 



Perennial caespitose grass, with ascendent culms; leaves acute fili- 

 form. 



