Colorado Weld Seeds 
41 
Fig. 55. Trailing 
Pigweed (Amaraii- 
thus blitoides). Top 
view (left), side 
view (right!, x 10. 
1. Trailing or Prostrate Pigweed 
{Amaranthus hlitoides S. Wats.) (Fig. 
35).— Seeds shiny black, smooth, faintly 
marked with fine lines, flattened at the 
edge, distinctly margined, 1.2-1.5 mm. 
across each face. 
2. Tumbleweed (Amaranthus 
graecizans L.) (Fig. 56). Seeds 
shiny black, more shiny than A. 
blitoides, margin less distinct tnan 
preceeding, .6-.7 mm. across each face. 
Fig. 56. Tumble- 
weed (Amaran- 
thus graecizans). 
A. Calyx enclosing 
utricle. B. Top 
view. C. E a g e 
view. X 10. 
Fig. 57. Rough 
'Pigweed (Amaran- 
a n t h u s retro- 
flexus!. X 8. 
3. Rough or Common Pigweed 
(Amaranthus retro flexus L.) (Fig. 
57). — Seeds shiny black, as in A. 
graecizans; margins less pronounced 
than in A. blitoides or A. graecizans, 
1-1.2 mm. long, .9-1 mm. wide. 
8. PURSLANE FAMILY 
(Portulacaceae) 
Ovary 1-celled ; capsule thin and translucent or hard and brit- 
tle, splitting open across, as a lid, or by 3-valves; seeds 2 to many, 
ovate to obscurely reniform in shape, globose or compressed ; 
embryo curved around the mealy endosperm. 
Purslane, Pussley 
(Portulaca (Tourn.) L.) 
Capsule 1-celled, thin and translucent, splitting or opening by a lid, many 
seeded; seeds flattened, ovate to reniform in shape. 
Common Purslane (Portulaco oleracea 
(Tourn.) L.) (Fig. 58). — Seeds black, 
dull to dull-shiny, flattened, obscurely kid- 
ney shaped with a distinct white mark at 
the hilum; 3-4 concentric rows of minure 
pro.1ections give the seed a finely roughen- 
ed appearance; the edges are faintly purslane 
grooved by 2-3 annular lines; seeds .5-.S 
mm. long. x 22. 
