AIEA. , 409 



27. Ai'ka Linn. Hair-grass. 



* Lower pale truncate, jagged. Nut free, not furroxved on the back. 



' Dbschamtsia Beauv. ' 



t Awn straiglit. 



1. A. ccBspitdsd (L.) ; pan. spreading, 1. flat, gl. slightly rough 

 at the midrib, aim from below the middle of the pale and scarcely 

 extending beyond its tip, ped. of second fl.- downy or hairy. — 

 K B. 1453. P. 23.— Root tufted. St. 1—4 feet high. L. 

 rigid, roughish ; their margins involute when dry. Pan. -tranches 

 l^ough, Lo*er pale, with 4 veins in addition to that whiph ends 

 in the rough awn. . Rudiment of third fl. often scarcely, if at all, 

 distinguishable j or half the length of the upper fl, and somewhat 

 clavate. — ^. bremfolia (Pam,) ; radical 1. shprt, sheaths and st, 

 smooth, panicle small. P. 106. Viviparous . states are often 

 called A. alpina. — y, longiaristata (Pam.) ; awns exceeding the 

 fl;, Sheaths rough. P. 105, — Meadows, thickets, &c, fi. arid y. 

 Mountains, P. VII. E.S,!,' 



tt Awn bent, twisted at the base. 



2, A. alpina (L.) ; pan, x;lose, 1. mostly involute, gl. smooth on 

 7nidrib, awn from above the middle of the ^afe , and scarcely ex- 

 tending beyond its tip, ped. of second flower (glabrous ?) very 

 short,— -E, B. 2102, P. 23,— Height 6—13 in, L. narrow, rigid, 

 roughish on the' upper surface. Pain.-branches quite or nearly 

 smooth ;' lower lax ; upper erect,— ^Fl, often viviparous, — Tops 

 of Highland mountains, ' P, Vin. S, 



, 3. A.Jlej£u6sa (L,) ; ; pan,, spreading, triply forked with wavy, 

 branches, 1. very narrow subsetacepus, awn from near the base of 

 the pak and extending considerably beyond jts tip, pedicel of the. 

 second fl, less than J of its length, ligule short truncate.— ^. IS.' 

 1519. P,; 107, — St, erect, slender, about a foot 'high. L. solid,' 

 nearly terete'. Upper sJieaths rough from above doivnwards. Lower 

 part notched at the tip. ^Heathy places. P. 'VTl." E.S. I. 



[A. tdigiiuSsa ("Weihe) ; very like A.Jlexiiosa but the ligule is 

 oblong-acute. It' seems to have been found formerly at Loch 

 of Drum, Aberd., and near FOrfar. Is it there now P] , 



* * JOotver pale ii/id. Nyi annate to the pales, furrowed^ on the 



baaji. ' Nq rudiment of a iliird flower. Airopsi^ Fries. 



4. A. caryophyHlea (h.) ; pan. spreading triply fcffked, spike- 

 fets'rounded below, awn from below the riiiddle of the pale and 

 extending considerably' beyond its ■ attenuate deeplv bind tip, — 

 R B. 612. P. 24:-i Avma Koch,— St, .6— 12iin,liigh, L. short 

 aiid narrow: ■Sheaths roughish from below upwards. Spikelets 



I 



