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PAPERS ON BOTANY 141 
Boracinacean. Borage family 
LItTHOSPERMUM ARVENSE. Wheat thief. Bastard alkanet. 
Corn Gromwell. Stoneseed. Redroot. Nutlet dull brown, 
apex pointed, base truncate having 2 white tubercles, keeled on 
inner side; 2.5 to 5 mm. long and 1.5 mm. wide half way be- 
tween base and apex. Common impurity in wheat, rye, clover 
and alfalfa seed. Plate VI. 
SoLtaANACEAE. Nightshade family 
SoLANUM CAROLINENSE. Horse nettle. Bull nettle. Sand 
brier. Seed lemon yellow, slightly double convex, surface 
granular; 1.5 to 2 mm. in diameter. Impurity of clover and 
grass seed. Plate I. 
PLANTAGINACEAR. Plantain family 
Puiantco Ruceti. Red-stem plantain. Rugel’s plantain. 
Seeds brown to black, coarsely granular, angles acute, forms 
variable—oval, oblong, rhomboidal; 1 mm. in diameter at 
widest place and 2 to 2.5 mm. long. One of the most common 
weed seeds in clover, alfalfa and grass seed. Plate I. 
PLANTAGO ARISTATA. Large bracted plantain. Western 
buckhorn. Seed brown, canoe shaped with convex side marked 
by a transverse groove; a white line bounding base of canoe in- 
side, two pits appearing from concave side; 1.2 to 1.5 mm. in 
diameter and 2.5 to 3 mm. long. Common impurity of red 
clover and alsike clover. Plate II. 
PLANTAGO LANCEOLATA. Buckhorn. Narrow leaved plantain. 
Rib grass. English plantain. Seed brown, canoe shaped with 
thick wall, a scar seen from middle of concave side; 1 mm. in 
diameter and 2mm. long. Common impurity of red clover, 
alfalfa, alsike clover and grass seed. Plate II. 
ComposiTaE. Composite family 
ERrIGpRON ANNUM. Daisy fleshbane. Sweet scabious. White- 
weed. White-top. Achene brownish-white, slightly hairy with 
whorl of short bristles at apex; .5 mm. in diameter and 1 mm. 
long. Impurity of grass seed. Plate III. 
AMBROSIA ARTEMISIIFOLSA. Common ragwed. Small rag- 
weed. Hogwood. Roman wormwood. Wild tansy. Involucre 
grayish, top-shaped, armed with 6 to 10 short, acute spines; 3.5 
