IOWA ACADEMY OF SCIENCES. 87 



VI. Boat shaped seeds, oblonged and hollowed on one face. 



1. Shiny brown; about twice as long as broad. Light colored line 

 running lengthwise the convex face; length, ]i". 

 Plantago lanceolala, L. 

 3. Brown but not shiny; a slight transvei'se depression running 

 across the middle of the convex face; length, 1-U"; the hollow 

 white lined; two white rimmed depressions at the bottom of the 

 hollow. 



Planlago imtagonica var. aristata, Gray. 



VII. Seeds globose or nearly ovoid. 



1. (Treeuish, oily, naked seed; nearly ovoid; pointed; length, 1". 



( artemisicv folia, L. 

 '^"^^^^^^■«ii5si?os<ac%a, D. C. 



2. Gray black; globose; i" in diameter; surface irregularly roughened. 



Cuscuta epithymuni, Murr. 

 Fruit enclosed by glume and palet; a caryopsis. 



I. Flowering glume and palet smooth, shiny and coriaceous. 



1. One side flat, the other with a prominent hump; shiny green. 

 a Orbicular; 1" broad. 



Paspalum Iceve, Michx. 

 b Ovate, tapering to an acute point; length, li-2". 

 ^Panicuyn crus-galli, L. 



2. One side somewhat flattened, but the other not prominently 



humped. 

 a Ovoid; very dark gi*een; length about i". 

 Panicum capillare, L. 

 b NaiTowly oblong; light green; length about ly. 



Panicum proliferum. Lam. 

 c Linear oblong; pointed slightly at both ends; the second sterile 

 glume and the imperfect flower generally closely enveloping the 

 perfect flower. 



* Perfect flower usually black; first sterile glume almost want- 

 ing, second one equaling the flower; length, 1". 

 Panicum glabrum, Gaudin. 

 ** Perfect flower greenish; first sterile glume small, second 

 not more than half the length of the flower; length, H". 

 Panicum sanguinale, L. 



II. Flowering glume and palet roughened, but coriaceous; ovate. 



1. Length about 1"; greenish, light colored or dai'k brown; flowers 

 striate lengthwise and dotted. 



Seatria viridis, Beauv. 



7 Seeds of these two species generally appear naked and in this condition, I know 

 of no characters by which they can be separated. But when found with the involucre 

 intact they are easily separated. A. artemisicefolia has a crown of 6-8 stout tubercles 

 while A. psilostachjja is smooth. 



^Frequently the sterile glumes and the imperfect flower remain attached. In such 

 cases the species is easily distinguished by the stiff bristles on the second sterile 

 glume and the glume of the imperfect flower. The glume of tlie imperfect Mower is 

 also awned. 



