TRIANDRIA— DIGYNIA. Avena. 163 



A. bromoides. Linn. Sp. PL 1666. Willd.v. 1.453. Gouan Horf.52. 



A. n. 1499. Hall. Hist. v. 2. 234. 



Gramen avenaceum montanum, spica simplici, aristis recurvis. 



Rati Syn. 405. t.2\.f. 1. ed. 2. 252. ;i. 2, ^ 345. 

 G. avenaceum angustif'olium alpinunij spicata panicula, ex pur- 



pureo, viridi, et argenteo variegata. Scheuchz. Agr. 230. 

 G. avenaceum alpinum glabrum angustifolium, locustis aristatis, 



in spicam dispositis. Ibid. 228. t. 4./. 21, 22. 



In dry chalky, or limestone, pastures, and heathy spots. 



Perennial. July. 



Root fibrous, tufted, downy. Stem 12 or 18 inches high, erect, 

 stiff, with one joint near the bottom, from which originates the 

 very long smooth sheath of the short uppermost leaf, investing 

 the greater part of the stem. Most of the leaves are radical, 

 tufted, rigid, finely serrated at their involute margins ; their 

 sheaths broad, smooth, durable. Panicle erect, resembling a 

 spike, many of the upper spikelets being sessile. Calyx-valves 

 narrow, 3-ribbed. Florets 4 or 5, the outer valve roughish, 

 ribbed, purplish, with a membranous point, often torn. Awn 

 from above the middle, purplish, with a white tip. Inner valve 

 finely fringed. Nectary much longer than the germen. Styles 

 scarcely any. Stigmas oblong, feathery. Hairs of the common 

 stalk, or receptacle, shorter than in the last. 



5. A. alpina. Great Alpine Oat-grass. 



Panicle erect, slightly branched. Florets about five, longer 

 than the calyx. Partial stalk bearded under each. Leaves 

 flat, minutely serrated, naked; sheaths rough. Root 

 fibrous. 



A. alpina. Sm. Tr. of Linn. Sac. v. 1 0. 335. 



A. planiculmis. Engl. Bot. v. 30. <. 2141. Comp. 20. Hook. 

 Scot. 43 ; but not Schrad. Germ. r. 1. 381 . t. 6.f. 2. 



On. lofty alpine rocks in Scotland. 



Found by the late Mr. G. Don in 1807, upon the rocky suminits 

 of the highest mountains of Clova, Angusshire. 



Perennial. July. 



Root of several strong downy fibres, tufted, not creeping. Stem 

 2 feet high, erect, round, striated, smooth, leafy in the lower 

 half. Leaves linear, rough-edged, or minutely serrated, flat, 

 naked, with many rough ribs ; the radical ones folded, at least 

 when dry, and their extreme margin inflexed ; but none of the 

 leaves are involute, as in A. pratensis, nor so strongly serrated. 

 Sheaths cylindrical, strongly ribbed, rough to the touch ; the 

 uppermost very long. Stipula triangular, acute, jagged ; the 

 uppermost somewhat elongated. Panicle 3 or 4 inches long, 

 erect, of a pale silvery brown, but little variegated ; branches 

 furrowed, or compressed, rough at the opposite sides with mi- 



