Colorado Weed Seeds 
Rocky Mountain Bee Plant {Cleomc, 
serrulata PursK, Peritoma serrulatum 
(Pursh.) DC.) (Fig. 85).— Seeds dull, 
variable in color, mostly yellow-drab, bone- 
brown or black, flattened, grooved as 
though folded together lengthwise, rough- 
ened with blunt projections more distinct 
on the edges; seeds 3-4 mm. long, 2-2.5 
mm. wide, usually ovate or oval-shaped, 
pointed at the hilum, rounded at the other 
extremity. 
15. ROSE FAMILY 
(Rosaceae) 
Fruits variable, usually an achene or follicle, or a druplet ; 
achenes may be hairy or smooth, and may split open or remain 
intact at maturity; seeds mostly without endosperm. 
Key to Genera 
Seeds many-sided — irregular in shape 
Seeds two-sided — regular in shape 
Seeds hairy 
Seeds not hairy 
1. Rose 
{Rosa (Tourn.) L.) 
Achenes numerous, enclosed in a berry-like, fleshy covering ; achenes 
become hard and bony at maturity. 
Arkansas Rose {Rosa arkansana, Porter) (Fig. 86). — Seeds hazel to 
buckthorn-brown in color, prismatic though irregular in shape, with 3-6 
faces, smooth, 3.5-4 mm. long, 2-3 mm. wide. 
1 . .Rosa 
2 . . Geum 
3 . .Potentilla 
Fig. 85. Rocky Moun- 
tain Bee Plant (Cleome 
Fig. 86. Arkansas Rose (Rose arkansana) 
A. Two achenes united. B. Single achene, top 
view. X 10. 
