4 
WEED SEEDS FOUND WITH BLUEGRASS SEEDS. 35 
Anthemis cotula L. 
DOG FENNEL, MAYWEED. 
Seeds (akenes) cylindrical, broadly club-shaped, 13-2 mm. long, straight or 
curved; surface dull and usually roughened by 
many small tubercles more or less distinctly 
arranged in ten rows, indistinctly few-tubercled 
or nearly smooth, but commonly more or less 
evidently ten-ribbed; base tipped by the rounded, 
whitish scar; apex rounded or slightly pointed; 
color varying from light to dark brown. (Fig. 25.) gig. 95.—seeds of dog fennel(Anthemis 
Found occasionally, but never abundantly, in eotula): a, side views; b, natural size 
both American and European bluegrass seed. of seeds, 
Chenopodium album L. 
LAMB’S-QUARTERS, PIGWEED. 
Seeds nearly circular, lens-shaped, with blunt edges, 1-1} mm. in diameter, occur- 
ring in commercial seeds as free seeds or as fruits, the seeds proper being invested by 
the thin pericarp; free seeds jet black, smooth 
or nearly so, and highly polished; scar occu- 
pying a curved groove extending from the cen- 
ter to the edge of one face and usually evident 
as a light-colored line; fruits only slightly 
larger than the seeds, mostly gray or black and 
dull; pericarp wall often broken away, expos- 
ing theshining black surface of theseed; again, 
Fig. 26.—Seeds of lambs quarters (Chenopo- this wall and the seed coat are often. broken 
dium album): a, various forms of seeds; 0, : : ee: 2 
Bien ciecloneeeds: exposing the yellowish or whitish embryo and 
endosperm; embryo cylindrical, occupying 
the border of the seed and surrounding the endosperm, its extremities almost meet- 
ing, the tip of the caulicle occupying an extension of the seed coat at the edge beside 
the sear. (Fig. 26.) 
Found chiefly in Kentucky bluegrass and Canada 
bluegrass seeds, but not frequently and never abun- 
dantly. 
Plantago lanceolata L. 
RIB-GRASS, BUCKHORN, ENGLISH PLANTAIN. 
Seeds oval-oblong, 13-3 mm. long, flattened, one 
face convex, the other having a deep groove and Fie. 27.—Seeds of rib-grass (Plan- 
rounded, infolded edges which scarcely meet at one —‘@g0 lanceolata): a, front and back 
end; surface smooth or slightly uneven, shining in eae Oi seeds.g0; Delunalsizerds 
fresh seed, brown or somewhat amber-colored; scar sis” 
situated at the center of the grooved face; embryo straight, in the center of the 
endosperm, usually evident through the somewhat transparent endosperm and seed 
coat. When placed in water the seeds develop a coat of transparent mucilage. 
(Fig. 27.) 
Small seeds are found to some extent in both American and European seed; more 
commonly in Kentucky bluegrass than in Canada bluegrass seed. 
