Ix] “ SEEDS ” 145 
Agrostis alba, L. (var. stolonifera). 
Palea enclosing the fruit 1:83—2 mm. long, white, 
delicate, membranous, with a blunt notched apex and 
three (or five) nerves: occasionally there is a fine kneed 
basal awn, not projecting. 
The glumes may remain attached: the outer has a 
serrulate keel, and often a violet hue. No awn. About 
2—3 mm. 
Caryopsis about 1:1 mm. long, oblong, yellow, corn- 
shaped, furrowed, shining through. 
A. vulgaris, L., is a variety with slightly smaller 
fruits, no awn, and usually three nerves to the palea, 
but they cannot be distinguished with certainty by the 
“seed.” Rachilla obsolete. 
The colour of the glumes may vary considerably and is some- 
times yellow. 
The absence of awn, rachilla, and basal hairs distinguishes 
Agrostis from Aira. 
AA Palea membranous, ribbed, tips scarious. 
Glyceria aquatica. 
G. fluitans. 
Glyceria aquatica, Sm. 
Palea strongly 5—7 ribbed, obtuse and scarious, about 
4mm. long. Green with a purple cast. Caryopsis dark- 
brown, about 2 mm. long. 
Inner palea punctate. Rachilla slender and cylindrical. 
Glyceria fluitans, Br., is very similar, but longer 
(6 mm.) and more slender; the palea scabrid with 
truncate or ragged tips, and the inner palea not punctate. 
Yellow. (Fig. 46.) 
W. 10 
