76 TEIANDEIA DIGYNIA. [CL. III. 



husks minutely wrinkled. Annual : flowers in July and August : 

 grows in corn-fields about London and Norwich. : rare. Eng. Bot. 

 vol. xiii. pi. 874. Eng. Fl. vol. i. p. 98. 125. 



2. P. viride. Green Panick-grass. Panicle spiked, cylindrical, 

 continuous, with numerous prominent bristles, rough, with erect 



teeth. Smaller than the last, but closely resembling it, the 



principal difference lying in the more numerous bristles with teeth 

 directed upwards. Annual : flowers in July and August : grows 

 in sandy fields about London and Norwich : rare. Eng. Bot. vol. 

 xiii. pi. 87-5. Eng. Fl. vol. i. p. 99. 126. 



3. P. Crus-galli. Loose Panick -grass. Panicle erect, branched , 

 bristly ; flowers awned, unilateral ; leaves lance-shaped, harsh, 



destitute of stipules. Boot fibrous : stems about a foot high, 



smooth : leaves pointed : panicle erect, stiff, unilateral, with an- 

 gular rough-edged stalks. Annual : flowers in July and August : 

 grows in wet corn-fields near London : rare. Neither this species 

 nor the two preceding are indigenous, having been introduced 

 among corn. Eng. Bot. vol. xiii. pi. 876. Eng. Fl. vol. i. p. 100. 



127. 



23. AI'RA. HAIR-GRASS. 



Calyx of two unequal, keeled chaff-scales, containing two 

 perfect flowers, without rudiments of a third. Corolla of two 

 oblong, unequal husks, the outer larger, generally with a 

 twisted awn arising from above the base, the inner notched and 

 awnless. Nectary a cleft scale. Filaments hair-like ; anthers 

 protruded, pendulous, notched at both ends. Germen egg- 

 shaped. Styles short, distinct ; stigma large, feathery. Seed 

 egg-shaped, loose, covered with the membranous husks. 

 Named from airo, to destroy, formerly applied to Lolium te- 

 mulentum, 39. 



* Corolla awnless. 



1 . A. cristdta. Crested Hair-grass. Panicle dense ; calyx 

 longer than its stalk, shorter than the flowers ; chaff-scales and 



husks pointed. Root in dense tufts with downy fibres : stems 



erect, about nine inches high : panicle close, lance-shaped, witk, 

 silvery, purplish, erect flowers . Perennial : flowers in July ana 

 August : grows in dry pastures : common. Eng. Bot. vol. ix. pi. 

 648. Eng. Fl. vol. i. p. 101. 128. 



2. A. aqudtica. Water Hair-grass. Panicle spreading ; flowers 

 awnless, even, obtuse, longer than the calyx ; leaves flat ; stipule 



oblong. Root creeping : stems floating, branched, smooth, 



rising about a foot above the water : panicle erect, with spreading 

 branches. Perennial : flowers in June : grows in ditches, pools, 

 and the edges of rivers : not uncommon. Eng. Bot. vol. xxii. pi. 

 1557. Eng. Fl. vol. i. p. 102. 129. 



** Corolla awned. 



3. A. ccespitosa. Turfy Hair-grass. Panicle spreading ; flowers 

 about the length of the calyx, abrupt, hairy at the base ; awn 



short, from the lower part of the outer husk ; leaves flat. 



Straws from two to four feet high, erect, smooth, growing in large 

 tufts : panicle large, much branched, with small silvery purplish 

 flowers. Perennial : flowers in June and July : grows in moist 

 shady places, and in alpine ravines : common. Eng. Bot. vol. xxi. 

 pi. 1453. Eng. Fl. vol. i. p. 102. 130. 



