138 CLASSIFICATION OF [CH. 
II. ‘Seed” long (Corn and Barley type). Caryopsis 
oblong or flattened, usually trapped between the 
boat-shaped pale: if otherwise, with an awn. 
A. “Seed” awnless. There may be a short sharp point 
to the palea (mucronate), but no prominent hair- or 
bristle-awn exceeding half the length of the palea. 
(a) A “web” or tuft of hairs at the base or on 
the rachilla. 
(1) Hairs of basal tuft silky and erect. 
* Pencil of hairs as long as palea or longer. 
Calamagrostis lanceolata, Roth. 
Palea 3 mm. long, thin, two-toothed and with a short 
bristle at the apex. 
Other species of Calamagrostis are awned. None occurs as an 
ordinary impurity in “seed.” 
Arundo Phragmites, L. 
Palea narrow and long, 10—11 mm., delicate, entire, 
tapering to an acuminate point, violet, three-nerved, 
smooth. Caryopsis about 2mm. A pencil of long silky 
hairs on the rachilla. 
The long acuminate point is almost an awn. 
Calamagrostis also has long basal hairs : both are useless grasses 
agriculturally. For Glyceria see note, p. 146. Avena, Aira and 
Psamma are easily distinguished. 
** Pencil of hairs short. 
+  Palea mucronate, 11—12 mm. long: caryopsis 
4:5 mm. 
Psamma arenaria. 
