AMMOPHILA.] GEAMINEJE. 481 



DISTKIB. Shores of Europe, N. Africa ; species 4. ETYM. ^uos and 

 <iA., sand lover. 



1. A. arundina'cea, Host. ; panicle subcylindric white, fl. glume 

 linear-oblong acute 3 times as long as the hairs. Psamma arenaria, R. 

 andS. 



Sand-hills by the sea, N". to Shetland ; Ireland ; Channel Islands ; fl. July. 

 Rootstock widely creeping, binding the sand. Stems 2-4 ft., smooth or 

 scabrid above. Leaves long, rigid, convolute, polished without, scabrid and 

 glaucous within ; sheaths long ; ligule very long, 2-fid, torn. Panicle 3-6 

 in., straight, broadest and sometimes lobecl at the base, yellowish ; branches 

 short. Spikelets erect, pedicels scabrid ; empty glumes -J in., acute, keel 

 scabrid ; fl. glume and palea quite like the empty glumes in colour and 

 texture. Anthers % in., linear, yellow. DISTRIB. Of the genus. 



2. A. baltica, Link; panicle elongated interrupted, fl. glume lanceo- 

 late acuminate twice as long as the hairs. P. samma baltica, R. and S. 

 Ross Links and Holy Isle, Northumbd. ; fl. Aug.-Sept. Habit of A. arundina- 



cea, but distinguished by its laxer less cylindric panicles, more lanceolate and 

 acuminate glumes, and by the length of the hairs. The flowering glumes 

 are 5-nerved in both, but more faintly in A. bal'tica. DISTRIB. Seashores 

 from Holland to Gothland. 



19. liAGU'RUS, L. HARE'S-TAIL GRASS. 



Annual. Spikelets in a dense villous ovoid head, 1-fld., laterally com- 

 pressed ; rachilla produced. Empty glumes 2, much exceeding the 

 flowering, equal, long, with slender feathery points. Fl, glume membra- 

 nous, . shortly stipitate, with the pedicel of an upper flower at the back of 

 the palea, narrow, terete, with 2 short awns and an intermediate long bent 

 and twisted one. Palea 2-nerved. Scales 2, fleshy. Stamens 3. Ovary 

 glabrous ; styles very short, stigmas long feathery. Fruit smooth, 

 embraced by the glume and palea. DISTRIB. W. and S. Europe, N. Africa, 

 W. Asia. ETYM. \ayws and ovpd, hare's tail. 



L. ova'tus, L. ; leaves short flat, ligule short. 



Sandy places, Guernsey ; naturalized near Saffron Walden ; fl. June. Stems 

 6-10 in., very many, erect or decumbent below, stout, pubescent, leafy 

 below. Leaves broad, and inflated sheaths pubescent or villous. Heads 

 1-lf in., | in. broad, white, obtuse. Empty glumes in., very slender ; awn 

 twice as long as the nearly glabrous fl. glume. 



20. AIRA, L. 



Spikelets laterally compressed, loosely panicled, 2-fld., rachilla not 

 produced. Empty glumes 2, equalling the flowering, membranous, sub- 

 equal, acute, 1-nerved. Fl. glumes pedicelled, membranous, subequa'l, 

 convex, 3-nerved, toothed, awned at the back. Palea 2-nerved, 2-fid. 

 Scales acuminate, entire or 2-fi.d. Stamens 3. Ovary glabrous ; stigmas 



I I 



