Coi^oRADo Weed Seeds 
31 
Key to Species 
Ruchilla smooth 1..A. reioens 
Rachilla hairy 2.. A. tenerum 
Fig. 31. Quack 
Grass (Agropy- 
ron repens). a. 
Top view. B. Bot- 
tom view. X 4. 
A B 
Fig. 32. Slender 
Wheat Grass 
(Agropyron tener- 
um). A. Top view. 
B. Bottom view. 
X 4. 
1. Quack Grass {Agropyron 
repens {L.) Beauv.) (Fig. 31). — 
Seeds straw-yellow in color, 8-10 
mm. long, 1.5-2 mm. wide ; lemma 
smooth, strongly veined, bearing 
a sub-terminal awn from 2-4 mm. 
long ; rachilla smooth ; base 
smooth. 
2. Slender Wheat Grass 
{Agropyron tenerum Vasey) 
(Fig. 32). — Seeds of same color, 
length, and width as Agropyron 
repens; lemma hairy at the base, 
elsewhere smooth, strongly veined 
bearing a sub-terminal awn 2-4 
mm. long; rachilla hairy. 
13. Darnel, Rye Grass 
{Loliuni L.) 
Lemma 5-7 veined, veins converging at the two cleft apex; lemma bear- 
ing a sub-terminal awn one to one-half times as long as the seed ; awn rough ; 
palet shorter than the lemma; rachilla flattened, stout, cylindrical, usually 
smooth ; seeds 5-7 mm. long, 1-2.5 mm. wide. 
Fig. 33. Darnel (Lolium 
temulentum). A. Bottom 
view. B. Side view, x 9. 
Darnel {Lolium temulentum 
L.) (Fig. 33). — Seeds cinnamon in 
color, 4-5 mm. long, 2-2.5 mm. wide; 
lemma 7-veined, bifld at the apex 
and bearing a sub-terminal, rough 
awn one to one-half times the length 
of the seed ; seeds stout, as thick as 
wide ; rachilla stout, smooth. 
