338 IOWA ACADEMY OF SCIENCE 



straw colored. S., oval in outline with one side flat and the 

 other convex; surface smooth. O., common, especially on 

 waste ground, in gardens, etc. Native. 



4. Setaria glauca (L) Beauv. Yellow Fox-tail, Pigeon 

 Grass. L. 2.5 — 3.4 mm. W. 2. — 2.8 mm. C, dark brown or 

 straw colored. S., flattened oval, tapering almost equally at 

 each end : one side flat or sometimes slightly concave, the other 

 side quite convex. The concave side has coarser ridges, the 

 flat side being occupied by a sunken area. At one end, a 

 slight elevation is evident. Surface covered with minute 

 lateral striations. The extremities are blunt and the seed is 

 widest at the middle. 0., very common in gardens, bother- 

 some; commonly found in alfalfa, red clover and many other 

 kinds of farm seeds. Introduced from Europe. 



5. Setaria viridis (L) Beauv. Green Foxtail, Bottle-grass, 

 Green Pigeon Grass. L. 1.8 — 2.5 mm. W. 1.2 — 2. mm. C, dull 

 pale green to gray-brown often mottled with black. S., oval, 

 flattened on one side and concave on the other; surface with 

 fine longitudinal and transverse striations and a small rounded 

 projection at the basal end: resembles Setaria glauca but is 

 smaller and differs in that the flat side lacks the sunken area. 

 0., common in many farm seeds much the same as Setaria 

 glauca. Especially common in alfalfa, timothy and red clover 

 seeds. Introduced from Europe. 



6. Phlcum pratense L. Timothy, Herd's Grass, L. 1.2 — 1.8 

 mm. W. .7 — 1. mm. C, light straw to yellow. S., broad fusi- 

 form with the base slightly oblique and the surface reticulated 

 with oblong ridges or shallow pits. 0., common in grass 

 lands, cultivated. Introduced from Europe. 



7. Agrostis alba. L. White Marsh Bent Grass, Red Top, 

 Herd's Grass, Fiorin. L. .8 — 1.2 mm. W. .4 — .7 mm. S., 

 spindle shaped, almost elliptical, broad with one end pointed 

 and the other rounded ; scar short and rounded and not more 

 than i/4 the length of the seed: palea two-nerved and lemma 

 three-nerved, nearly equalling the glumes. 0., common in 

 grass lands and cultivated. Introduced from Europe. See 

 Harz, p. 1262, fig. 167, I-IV. 



8. Eragrostis megastachya (Koeler) Link. Stink Grass, 

 Snake Grass. L. .4 — .8 mm. "W. .3 — .5 mm. C. red-yellow 



