4 
Colorado Agricultural College 
A. Seeds without other parts of the flower (Salsola) 
adhering- 
B. Seeds armed with spines or prickles, or 
projections 
Spines or prickles barbed 
Spines numerous covering the rounded side 
, 25. .BORAGINACEAE 
Spines few; barbs projecting downward (Lappula) 
from 2-4 spiny awns at the apex 33. .COMPOSITAE 
Spines or prickles not barbed (Bidens) 
Spines or prickles numerous, covering the 
cylindrical seed, which is 12-18 mm. 

Spines or prickles few (Franseria) 
Spines or prickles slender, sharp, scat- 
tered thruout the seed 32. . AMBROSIACEAE 
Spines or prickles stout, blunt, arranged . . (Franseria') 
in a crown of 5-6 projections at 
32. .AMBROSIACEAE 
B. Seeds not armed with spines or prickles (Ambrosia) 
C. Seeds spherical in shape or nearly so 
Seeds smooth or only slightly roughened 
Seeds mostly black 
Hilum a point 
Seeds black, 2-2.5 mm. in diameter .. 10 . .CARYOPHYLLACEAE 
Seeds black to deep red, 1-1.8 mm. in (Vaccaria) 
diameter 13. . BRASSICACEAE 
Hilum a line or scar, usually white or (Brassica, not B. alba) 
lighter in color than the remainder 
of the seed 16..FABACEAE (Vicia) 
Seeds not black ; seeds yellowish or reddish, 
irregular or slightly flattened 
Seeds grooved 1 3. . BRASSICACEAE 
(Brassica alba) 
Seeds not grooved 13. .BRASSICACEAE ' 
Seeds not smooth (Raphanus) 
Seeds covered with fine, white, bristly 
hairs 31. . RUBIACEAE 
Seeds not covered with fine, white, bristly (Galium) 
hairs 
Seeds black, covered wdth a network of 
shallow pits 12 . . PAPAVERACEAE 
Seeds ash-colored, covered with rough, (Argemone) 
rounded projections; seeds marked 
with a seam-like ridge (raphe) on 
side 19. .EUPORBIACEAE 
C. Seeds not spherical in shape (Euphorbia) 
D. Seeds circular in outline 
Seeds notched, marked with fine papillose 
^id&es 9. .ALSINACEAE (Alsine) 
Seeds not notched, not marked with line 
papillose ridges 
Seeds shiny black 7 . . AMARANTHACEAE 
Seeds not shiny black (Amaranthus) 
Seeds marked with a large circular 
scar on the flat side and a net- 
work of ridges on the rounded 
side 27..LARIATAE (Teucrium) 
