A FLORA OF GIBRALTAR AND THE NEIGHBOURHOOD 113 



Arundo Donax L. Sandy places, partial to clamp ; common ; 

 but almost always planted for fences; 9-11. Glumes subequal, 

 lower pale with long silky hairs below. [I. K.] III. In all sub- 

 districts, but looking native only by R. Lobo ! 



Phragmites communis Trin. By shore and by rivers ; rather 

 frequent ; 7-9. Glumes very unequal, lower pale glabrous. 

 I. Sandy Bay I III. i. Along the shore ! By the Lajo in many 

 places, ii. By the shore ! iii. Frequent by Aguacorte Eiver and 

 elsewhere ! Often with barren shoots several yards long. 

 P. gigantea J. Gay, 12-16 ft. high, is commoner in the province, 

 and may have been confounded with it or with Arundo Donax. 

 I have seen none of them in flower. 



Ammophila arenaria Link. var. arundinacea Husnot {Psamina 

 australis Mab.). Sand dunes; rather frequent; 5-6. More 

 slender than type, with longer hairs at base of pales. II. East 

 shore ! III. i. Linea Sands ! Near Campamento Common ! 

 Guadarranque ! ii. Palmones Playazo ! Sandy Bay! iii. Pal- 

 mones Sands ! 



Agrostis Juressi Link. Grassy places ; rare ; 6. Aspect of 

 A. verticillata but annual, panicle contracted, subinterrupted, 

 branches naked in lower part, pales unequal, the lower as long as 

 glumes. III. ii. S. de Palma, Bev. By the Miel above and 

 below Waterfall ! 



A. Benteri Boiss. Similar places; rare; 6-8. Perennial, 

 panicle always very lax and slender. III. i. Campamento Com- 

 mon, behind Fernando's ! 



A. alba Schva,d. Dry grassy places ; occasional; 5-6. Peren- 

 nial, leaves flat, panicle lax or narrow. III. i. About Campamento 

 and San Roque ! 



Var. gigantea Mey. is a large form with larger laxer panicle. 

 III. i. By the Cagancha in several places ! Stream near Second 

 Venta ! 



\N2iV. fuscescens Hack, has lanceolate acute glumes, becoming 

 brown at maturity. III. ii. Algeciras, Bev. 



iVar. myriostachys Hack, resembles A. Beuteri, glumes linear- 

 lanceolate, deep brown. III. ii. Algeciras, Bev. 



[Var. densiflora Pari. {A. scahriglumis B. & R.) is said to be 

 frequent in the province.] 



A. verticillataNWl. By streams; locally rather frequent ; 5-8. 

 Perennial, panicle dense, usually narrow, branches flowering to 

 base, pales equal, shorter than glumes. III. i. Well in Linea ! 

 By Almoraima Station, with rather lax panicle ! ii. Below 

 Palmones New Bridge, a very large form ! Above Waterfall, and 

 elsewhere in the mountains ! 



A. castellana B. & R. Dry hill slopes; the type rare; 5-6. 

 Like A. alba, but lower pale with two minute lateral awns, and, in 

 the type, a dorsal awn. III. i. Near San Roque, Ball ! 



Var. mutica Hack, has lower pale awnless, and is the usual 

 form. III. i. Queen of Spain's Chair ! mixed with type. 

 First Pine Wood! Campamento Common! ii. Waterfall 

 Valley ! 



Journal of Botany, August, 1914. [Supplement] i 



