Colorado VVlkd Sekds 
Si 
% 
:L Corn Sow Thistle, Fiei-d Sow 
1'iiTSTLE. Mii.k Tiiisti.e {f^ovchus arVCH.sis 
L.) (Fi^L IGO). — Seeds liver-brown in color, 
slii»litly flattened, roughened transversely, 
()-S ribbed on each side, ribs thick and rough; 
<ecds 'l-'l'l imii. long, 1-1.2 min. wide, stout, 
blunt, margin indistinct. 
4. Prairie Pink, Sand Pink, Skeleton Weed 
{Lygodesmia D. Don.) 
Achenes slender, either smooth, 
6-S ribbed or grooved, tapering 
slightly at the pappus end; pappus 
of numerous soft bristles as long <.r 
longer than the achene and usually 
[lersistent ; beak or tip an indistinct 
point. 
Sand I'ink (Lygodesmia juncea 
(Fursh.) D. Don.) (Fig. 161). — 
Seeds ivory-yellow in color, slender, 
cylindrical in shape, nearly circular 
in cross-section, 8-12 ribbed, 5-7 mm. 
long, .5-.S mm. wide. 
5. Dandelion 
(Taraxaeu-m (Haller) Ludv., Leontodon L.) 
Achenes mostly spindle shaped or fusiform (swollen In the middle and 
narrowing toward each end), with a long, slender, distinct tip; achenes 8-12 
ribbed, roughened with hard, sharp, small spines near the apex. 
Key to Species 
Seeds honey-yellow in color 1..T. officinale 
Seeds claret-brown in color 2..T. erythrospermum 
1. Dandelion, Common Dandelion^ 
Blow-ball (Taraxacum officinale Wehcr., 
Leontodon taraxacum L.) (Fig. 162). — 
Seeds honey-yellow in color, mostly 10-12 
ribbed, the ribs roughened with hard, sharp, 
small spines near the apex of the seed ; in 
the middle area of the seed the ribs are 
roughened with short, hard (not spined) 
processes; the' base of the seed is nearly 
smooth : seeds M-3.5 mm. long, .5-1 mm. wide, 
nearly circular in cross-section. 
Fig-. 162. Dan- 
delion (Taraxacum 
officinale), x 11. 
Fig. 161. Sand Pink (Dygodes- 
mia juncea). x 3. 
Fig. 160. Corn 
Sow-thistle (Son- 
chus arvensis). x 
1 
