MONOCOTYLEDONES. 91 
Var. glabrescens (Gren.) Not common. Mr Bennett 
considers that this var. is intermediate between 
glabrescens and hordeaceus (Fries.) He saw specimens. 
Genus CCXXXIT.—BRACHYPODIUM (Beauv.) 
520. B. SYLVATICUM (Beauv.), False Brome-grass. 
Scapa (Dr Boswell); Berstane (Dr Duguid) ; 
Hobister (R. Heddle). 
Genus CCXXXIII.—TRITICUM (Linn.) 
521. T. cANINUM (Linn.), Wheat-grass. 
Corn fields, Upper Hobister (R. Heddle); Howan 
(Prof. Trail); Deerness (M. Spence). 
522. T. REPENS (Linn.), Cowch-grass. Common. 
Var. barbata. Common. 
523. T. acutumM (DC.), Wheat-grass. 
Recorded by Dr Boswell—Scapa; Hoxa Links. 
524. T. suNceuM (Linn.), Rusky Wheat-grass. 
Rather searce. 
Scapa ; Swanbister; Hoxa; Bay of Newark, 
Deerness. 
Genus CCXXXIV.—LOLIUM (Linn.) 
525. L. PERENNE (Linn.), Rye-grass. Common— 
introduced. 
Genus CCOXXXV.—ELYMUS (Linn.), Lime-grass. 
526. E. ARENARIUS. 
Hoy; Hoxa; rather scarce (Dr Boswell). Sand- 
side, Deerness ; Breckness ; Biggings, Stenness ; Walls ; 
Holm, &c., local. 
Genus CCXXXVI.—NARDUS. 
527. N. stricta (Linn.), Mat-grass. Common. 
