140 CLASSIFICATION OF [CH. 
The “seeds” of Poa proper are nearly all small—not more than 
3—4 mm., more or less lanceolate, with tough, keeled glumes, and. 
when “webbed” tend to adhere together as if stuck with cobweb. 
The keeled glumes give them an angular appearance—triangular 
in section—and make them tend to lie on the side. Rachilla 
evident. Nerves of palez distinct. 
Poa pratensis, L. (Fig. 55). 
“Seed” 2—3 mm. long, brownish: caryopsis about 
1—1°5 mm. Outer palea acute, indistinctly 3—5 nerved, 
edges and keel, silky; margins overlapping the hyaline 
inner palea. 
The “web” looks like hyphe of a mould. 
Caryopsis ellipsoid-acute, with traces of the stigma. 
It falls easily. No distinct groove, section somewhat 
triangular. Rachilla truncate. 
Fig.54. Poa nemoralis. Fig. 55. Poa pratensis. Fig. 56. Poa trivialis. 
c, the minute “seed” 
(to the right) and 
caryopsis (to the left) 
nat. size. a, the 
“seed,” x8; b, the 
caryopsis, x 8. Traces 
of a basal ‘*‘ web,” not 
shown here, occasion- 
ally occur. Nobbe. 
Type of a ‘* webbed 
seed.’ a; ““seedy”’ 
xabout 7; b, cary- 
opsis (inverted), x 7. 
Betweenare thesame, 
nat. size. Note the 
nerves on the palea 
and the conspicuous 
‘““web”’ at the base a. 
Nobbe. 
Poa compressa, I. 
a, ‘‘seed,” nat. size 
and x8; b, cary- 
opsis, nat. size and 
x7. Note the con- 
spicuous ‘‘ web.” 
Nobbe. Cf. Fig. 43. 
Palea obtuse, nearly glabrous and nerveless, or faintly 
