533 
CVn. GRAMINEAh 
[Agrostis, 
equal, outer one rough on the keel above, outer glumella 3- 
nerved twice as long as the inner, ligule extremely short and 
truncate. — a. mutica ; spikelets awnless. E.B. t. 1671 : Pam. 
Gr. t. 12. — f3. aristata; spikelets awned. Pam. Gr. 1. 13. A. 
canina With. — y. pumila ; scarcely 3 inches high, spikelets 
often awned. Pam. Gr. t. 12. A. pumila Light/. Scot. p. 1081 
{Jig. in title-page). 
Meadows, pastures, and banks, common everywhere. 21. 6,7. — 
Rhizome creeping, throwing out many, mostly ascending culms, 1 or 
] ^ foot high. Sheaths usually smooth. Panicle purplish ; rachis 
smooth, and the branchlets nearly so. Glumes lanceolate, glabrous, 
shining, rough on the back. Ghimellas 2, thin, delicate, membranous, 
unequal ; outer one a little shorter than the glumes, 3-nerved, tridentate, 
awnless in a. ; bearing an awn of uncertain length in /3. , but mostly 
short, arising from the central nerve a little below the middle of the 
back ; inner glumella half as small, 2-nerved, bifid. Specimens of this 
species sometimes, though very seldom, occur, bearing the rudiment 
of a second floret upon a rather long stalk, in the same calyx. 
4. A. alba L. ( Marsh B.) ; branches of the panicle hispid its 
branchlets erect after flowering, glumes nearly equal, outer one 
rough on the keel all over, outer glumella 5-nerved twice as 
long as the inner, ligule elongated acute. — a. culms erect. E. 
B. t. 1189: Parn. Gr. tt. 13, 14. — d. stolonifera; culms with 
long prostrate scions. Pam. Gr. t. 14. A. stolonifera L. : E. 
B. t. 1532. — y.maritima; culms procumbent rooting at the 
joints, panicle small lobed. 
Pastures, road-sides, and in various other situations, abundant, TJ.. 
7,8. — Very closely allied to the last, and united to it by Mr. Bentham. 
Culms ascending, often rooting at the base, or throwing out scions 
( stolones ). Panicle rather contracted, pale green or purplish, branch- 
lets patent during flowering, more erect afterwards, and giving the 
panicle a compact appearance. Glumes like those in A. vulgaris, as 
are the ghimellas ; but the outer one has 5 nerves and as many teeth, 
and the inner one is only faintly 2- or 3-nerved at the base, nearly 
entire and obtuse at the extremity. In some specimens there is a 
short awn at the base of the outer glumella : this constitutes the A. 
compressa Willd. ; and occasionally the flowers are viviparous, when 
it is the A. sylcatica Linn. 
** Upper glume the larger, 3-nerved, as long as the lower glumella ; lower 
1 -nerved. Outer glumella with a long awn from near its summit. 
Neuter floret filiform. Apera. 
5. A. Spica-venti L. ( spreading silky B.) ; panicle spreading, 
glumes unequal lanceolate rough on the keel, outer glumella 
bifid with a subterminal long straight awn, inner one smaller 
with a small stalk-like neuter floret at its base, anthers linear- 
oblong. E. B. t. 951. Apera Beauv. Anemagrostis Trin. . 
Parn. Gr. t. 17. 
