FAMILY KEY 
Seeds with other parts of the flower adher- 
ing, which parts appear as remnants and not 
as enclosing structures 
Seeds mostly grain-like enclosing in chaffy 
membraneous scales (bracts) 1. 
Seeds not grain-like, enclosed in chaffy mem- 
braneous scales 
Seeds circular in outline 
Seeds with a notched wing; seeds not tight- 
ly enclosed in a leaf-like calyx 
Wing marked with fine radial lines 29. 
Wing not marked with fine radial lines. ... 6. 
Seeds not winged; seeds tightly enclosed in 
a minute leaf-like calyx 6. 
Seeds not circular in outline 
Seeds napiform in outline 
Seeds usually light brown in color 2. 
Seeds shiny black to dull black in color. . 5. 
Seeds not napiform in outline 
Seeds triangular in cross-section; russet 
or red to dull or shiny black in color. 5. 
Seeds not triangular in cross-section 
Seeds bearing a pappus at the apex 
Pappus long, silky or feathery; seeds 
nearly circular in cross-section 
Seeds 8-12 ribbed, smooth 34. 
Seeds mostly 10-ribbed, hairy thru- 
out 33. 
Pappus of short, blunt scales or 
teeth;, seeds flattened, truncate 
» Pappus of 1-2 awl-shaped teeth... 33. 
Pappus or numerous (2-3 series) 
short blunt scales 34. 
Seeds not bearing a pappus 
Seeds reniform in outline; seeds 
notched; adhering “scales” 
ridged ^ 
Seeds not reniform in outline; seeds 
not notched; adhering scales not 
ridged 
Seeds trowel-shaped 
Seeds enclosed in mealy bracts 
joined or nearly so at the 
apex 
Seeds enclosed in hairy bracts not 
joined at the apex; seed apex 
terminating in a knob-like 
projection 
Seeds not trowel-shaped 
Seeds irregular in outline (mostly 
ovate), flattened, roughened. 
grooved longitudinally 6 
Seeds regular in outline; flat on 
one side, deeply rounded on 
the other; embryo spirally 
coiled (• 
.GRAMINEAE 
. SCROPHULARIACE AE 
(Linaria) 
. CHENOPODI ACE AE 
(Cycloloma) 
. CHENOPODI ACE AE 
(Chenopodium) 
.CYPERACEAE (Carex) 
. POLYGONACE AE 
(Polygoixum, not avicu- 
lare or convolvulus) 
. spOLYGONACE AE 
(Rumex, Polygonum 
aviculare and con- 
volvulus) 
.CICHORIACEAE 
(Lygodesmia) 
.COMPOSITAE 
(Laciniaria) 
.COMPOSITAE 
(Ratibida) 
.CICHORIACEAE 
(Cichorium) 
. .MALVACEAE 
(Malva, Malvastrum) 
. .CHENOPODIACEAE 
(Atriplex) 
..URTICACEAE (Urtica) 
CHENOPODIACEAE 
(Kochia) 
. .CHENOPODIACEAE 
