20 TRIANDRIA DIGYNIA. 



2. A. alba, stem spreading, creeping ; stipula oblong, ribbed ; 

 panicle condensed at the base of the main divisions, stalks rough ; 

 calyx-valves lanceolate, bristly at the keel ; corolla rarely with 

 a short awn. Marsh Bent-grass. 



Hab. Moist meadows and road sides. At the side of the ca- 

 nal below New-water Haugh, and in other inland situa- 

 tions, the specimens answer exactly to the description of 

 the A. alba in Flor. Brit. ; but along our shores, where it 

 grows abundantly in wet clayey spots, the panicle is more 

 dense, the branches being not at all spread out, a variety 

 which constitutes the A. stolonifera of the same work. 

 July, Aug. If. 



This is the Fiorin-grass of Dr RICHARDSON, and the Irish 

 agriculturists, but has never been cultivated to any extent 

 in this country. To be in perfection, it requires a moist 

 climate or a wet soil, and it grows luxuriantly in cold 

 clays unfitted for other grasses. In light sands, and in 

 dry situations, the produce is much inferior both as to 

 quantity and quality. 



26. AIRA. 



* Corolla awnless. 



1. A. cristata, panicle spiked, lanceolate ; calyx longer than its 

 flower-stalk, 'shorter than the florets ; glumes all pointed. (A 

 span high.) Crested Hair-grass. 



Hab. Dry elevated pastures not uncommon. About Gene- 

 sis Gull-hole, Thomp. Links at Holy Island, Winch, 

 Banks beyond Spittal, and opposite Spring Gardens, &c. 

 July. If. 



2. A. aquatica, panicle spreading ; florets even, obtuse, longer 

 than the calyx ; leaves flat, stipula oblong ; stems floating. 

 Water Hair-grass. 



Hab. Ditches and watery places not uncommon. In a ditch 

 below Calf-Hill, Thomp. Common about Ord ; Tweed- 

 mouth Fields ; Banks beyond Spittal. June. 1L 



* * Corolla awned. 



3. A. ccespitosa, panicle spreading, very large ; florets about the 

 length of the calyx, abrupt, hairy at the base, one of them on a 



