AgrOsUs.] TRIANDlllA DIGYNIA. 35 



in the length of the dorsal aivn, which is sometimes included within the 

 calyx, at other times considerably exserted. I have never seen more 

 than one valve to the corolla, not even the rudiment of a second ; and it 

 is from this circumstance that Schrader has constituted of it the genus 

 Trichodium. But other species of Agrostis have a very reduced co- 

 rolla, and A. setacea, placed in Trichodium by Dr Lindjey, has assur- 

 edly an inner corolla, and that constantly. Smith and Leers have de- 

 tected an inner valve, even in A. cnnina; hence, as the former observes, 

 its presence or absence does not afford even a specific character. 



2. A. setcicea. Curt, (bristle-leaved Bent-grass); branches of the 

 panicle short close, spreading in flower, cal. -valves unequal lan- 

 ceolate rough at the keel, outer valve of the corolla with a long 

 geniculated twisted awn from its base, inner very minute, leaves 

 setaceous. E.Bot.t. 1188. — Trichodium, R. 8)- S. 



Very local, almost wholly confined to the dry downs of the extreme 

 south and south-west parts of England ; as Hampshire, Devonshire, and 

 Cornwall. Ft. June, 3\x\y. If. . — Larger valves of the corolla white, thin, 

 and membranous, truncate at the top, with 4 green nerves, of which two, 

 the lateral ones, project into mucros. Aioi from the very base, rough, 

 truly geniculated and twisted. Inner valves very small, truncate and 

 toothed, accompanied on each side at the base by a pencil of white hairs. 



3. A. Spica venti, L. (silky Bent-grass) ; panicle spreading, 

 cal.-valves unequal lanceolate rough at the keel, outer valve of 

 the corolla bifid terminated by a long straight awn, inner one 

 smaller with a small barren pedicel at its base. E, Bot. t, 951. 

 — Anemagrostis, Trin. 



Rare, in sandy fields which are occasionally flooded, principally about 

 London: in Norfolk and Lancashire. Fl. June, July. 0. — A beautiful 

 grass, with very slender branches to its ample panicle, which is wavy 

 and glossy like silk, well named by old Parkinson " Gramen agrorum 

 venti spica." Awn many times longer than the cor., rough. Inner valve 

 of CO?', not much less than the outer: at its base is a little pedicel, des- 

 titute of flower, which has a small tuft of hair on each side. 



4. A. vidgdris,V<'i\h. (^fine Bent-grass); branches of the pani- 

 cle smoothish its branchlets diverging, outer valve of the cor. 3- 



nerved, ligule extremely short and truncate. E. Bot. t. 1671 



/3. aristata ; outer valve of the cor. awned. A. canina. With 



y. pumila ; scarcely three inches high. A. puinila, Lightf. Scot, 

 p. 1081.^^. i7i title-page. 



Meadows, pastures, and banks, common everywhere. Fl. June, Julv. 

 ■y. — Root creeping, throwing out many, mostly ascending culms, 1 or 

 IJ foot high. Panicle purplish ; rachis smooth and the branchlets 

 nearly so. Cal.-glumes lanceolate, smooth, shining, rough on the back. 

 Cor.-glume of 2 thin, delicate, membranous, unequal valves ; outer one 

 a little shorter than the cal., 3-nerved, tridentate, awnless in a ; bearing 

 an awn of uncertain length, but mostly short in /s, arising from the cen- 

 tral nerve, a little below the middle of the back ; inner valve half as 

 small, 2-nerved, bifid. — I possess specimens of this species bearing the 

 rudiment of a second flower upon a rather long foot-stalk, in the same 

 calyx. 



5. A. alba, L. (77mrsh Bent-grass); branches of the panicle his- 



